CN115161521A - Heat treatment-free die-casting aluminum-silicon-zinc alloy - Google Patents
Heat treatment-free die-casting aluminum-silicon-zinc alloy Download PDFInfo
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Abstract
The invention relates to a heat treatment-free die-casting aluminum-silicon-zinc alloy, which comprises the following components in percentage by weight: si:7.14-7.94%; zn:0.34 to 0.91 percent; fe:0.17 to 0.27 percent; mg:0.26 to 0.54 percent; mn:0.57-0.73%; la:0.04-0.09%; sr:0.042-0.048% and the balance of Al. According to the invention, zn is introduced, the alloy strength is improved through the solid solution strengthening effect of Zn in the aluminum alloy, and then the alloy is subjected to modification treatment by adding Sr and La elements, so that crystal grains are refined, the alloy structure is improved, and the comprehensive performance of the alloy is improved. The alloy has tensile strength of more than 325MPa, yield strength of more than 160MPa, elongation of more than 12% and excellent forming performance in a non-heat treatment die casting state, can be used for large-scale integrated die casting, and can be processed by using clean energy and waste aluminum.
Description
Technical Field
The invention relates to the technical field of metal materials, in particular to a heat-treatment-free die-casting aluminum-silicon-zinc alloy.
Background
With the deep promotion of carbon peak reaching and carbon neutralization policies, the carbon emission index is continuously adjusted to be low, the regenerated aluminum embodies the obvious advantage of low energy consumption, the dependence of price rising along with electricity of the aluminum industry is eliminated, and the regenerated aluminum industry is taken as the leading industry, so that the method is more favorable for the healthy, stable and long-term development of the aluminum industry. The energy consumption of the secondary aluminum is only 5 percent of that of the primary aluminum, and only 0.5 ton of carbon dioxide emission is generated. Compared with the production of equivalent raw aluminum, the production of 1 ton of secondary aluminum is equivalent to saving 3.4 tons of standard coal, saving 14 cubic meters of water and reducing 20 tons of solid waste discharge. The importance of secondary aluminum to "carbon neutralization" is that it is one of the major routes to reduce carbon emissions in the aluminum industry. Meanwhile, the secondary aluminum has remarkable economic benefit. The production of the primary aluminum relates to the exploitation, long-distance transportation and the like of bauxite, the production energy consumption of the alumina and the thermal electrolytic aluminum is huge, and the production cost of the secondary aluminum is lower compared with the production of the primary aluminum. With the rapid increase of the social conservation quantity of the waste aluminum in China and the continuous soundness of waste resource recovery systems, the price of the waste aluminum is expected to be further reduced, and the cost advantage of the secondary aluminum production relative to the thermal electrolysis of the primary aluminum is more prominent; or the raw aluminum is electrolyzed by clean energy, and the emission of carbon dioxide can be reduced, wherein the clean energy comprises hydropower, wind power or photovoltaic energy.
As Tesla super plants fall to the ground and sea and successfully develop large chassis parts through an integrated die-casting process, domestic new energy vehicle enterprises are raised with a surge. Because the traditional vehicle body has various manufacturing procedures, complex flow and more welding points, the integrated die casting can realize the integrated molding of part or whole vehicle body components, and the complex process of welding after split stamping and die casting is reduced, the advantages of low cost and high efficiency are realized, tesla announces that the Model Y of the vehicle body can adopt an integrated die casting rear floor assembly, the weight of the lower vehicle body assembly can be reduced by 30%, and the manufacturing cost of corresponding parts can be reduced by 40%. And in the continuous development process of the integrated die-casting technology, the CTC technology replaces a module/battery pack, and the battery core is directly integrated to the chassis, so that the integrated die-casting technology has strong advantages in weight reduction and vehicle body arrangement optimization. In the aspect of materials, the integrated die casting uses a heat-treatment-free aluminum alloy material. Because the projection area of the integrated die casting is large, a plurality of parts or even dozens of parts are integrated into a single part, and heat treatment is an effective way for guaranteeing the mechanical property of the die casting parts. However, the heat treatment process is prone to cause dimensional deformation and surface defects of the automobile parts, and a huge cost risk is required for large-scale integrated parts. Therefore, the heat treatment-free aluminum alloy material makes large automobile die castings possible. The heat-treatment-free new material plays a vital role in promoting light weight of the automobile, saving energy, reducing emission, increasing the cruising ability of the new energy automobile, improving the safety of the automobile and the like.
The integrated die casting generally has the characteristics of large size, thin wall thickness, complex structure and the like, so that the requirements on the mechanical property and the casting property of the integrated die casting aluminum alloy material are higher, the material still has good mechanical property after being formed under the condition of no need of heat treatment, and in addition, the requirements on collision and fatigue property are also required for the vehicle body structure, so that the integrated die casting material has high strength and plasticity in an as-cast state. In recent years, in order to meet the market demand of the automobile industry, the development of heat-treatment-free die-casting aluminum alloy has attracted more and more attention, for example, a low-alloy Al-Si high-toughness die-casting aluminum alloy (patent publication No. CN 114262826A) developed by Chongqing research institute of Shanghai university of traffic, the strength and plasticity of the alloy material are excellent, but the silicon content in the alloy is lower, which causes poor melt fluidity during the die-casting process and risks of insufficient filling for large castings. As for the high-toughness die-casting aluminum alloy developed by Shanghai Yongmaotai automobile parts and Shanghai university of transportation (patent publication No. CN 109881056A), although the alloy has good casting performance, the alloy elongation rate in the non-heat treatment state of die-casting is only 7%, and the high-toughness requirement of automobile structural parts cannot be met. There is also an Al-Si alloy containing Mo and Zr developed by Hubei Xinjinyang resources GmbH (patent publication No. CN 110760721A), which is excellent in mechanical properties, but because both elements Mo and Zr are expensive, the alloy requires 500 yuan or more per 0.05% Mo added, and 1000 yuan or more per 0.2% Zr added, and the cost thereof is too high. On the premise of meeting the basic mechanical property requirement, the cost is also taken into consideration. In addition, the non-heat treatment self-strengthening aluminum-silicon alloy (patent publication No. CN 104831129A) developed by Fengyang Elsi and Shanghai university of transportation has high control on impurity elements, cannot be produced by waste aluminum, and cannot meet the requirements of future carbon peak reaching and carbon neutralization background. And an aluminum-silicon alloy developed by automobile technology (Anhui), inc. (patent publication No. CN 114560019A), which does not contain elements capable of improving the strength of the alloy, so that the yield strength of the alloy is low and the requirement of a vehicle body structure on the strength cannot be met. Therefore, on the premise of energy conservation, emission reduction and cost reduction, the development of the heat-treatment-free aluminum alloy material which has high strength and high toughness and is suitable for large-scale integrated die casting is developed on the road promoting the development of new energy automobiles.
Disclosure of Invention
The invention aims to provide an aluminum alloy material which is suitable for large-scale integrated die castings and still has high strength and high toughness in a die casting state without heat treatment. According to the invention, zn element is introduced on the basis of Al-Si alloy, the alloy strength is improved through the solid solution strengthening effect of Zn in the aluminum alloy, but the addition of Zn can cause the original fine eutectic Si to be coarsened, so that the coarsened eutectic Si is subjected to modification treatment by further adding Sr and La elements, crystal grains are refined, and the comprehensive performance is improved. The alloy can be produced by adopting recycled waste aluminum, the carbon emission in the production process is reduced, the die-casting formed part does not need heat treatment, the tensile strength of the alloy can reach more than 325MPa in the die-casting state, the yield strength can reach more than 160MPa, and the elongation can reach more than 12%.
The invention relates to a heat treatment-free die-casting aluminum-silicon-zinc alloy which comprises the following components:
Si：7.14-7.94％；
Zn：0.34-0.91％；
Fe：0.17-0.27％；
Mg：0.26-0.54％；
Mn：0.57-0.73％；
La：0.04-0.09％；
Sr：0.042-0.048％；
the balance being Al.
According to the invention, mg and Si elements are added into the aluminum alloy, mg and Si can form an Mg2Si strengthening phase, the strength of the alloy is improved, and the casting performance of the alloy can be improved by adding the Si element; the addition of Fe and Mn elements can make the material more convenient for demoulding; a small amount of Zn is added, so that the alloy strength can be improved through the solid solution strengthening of Zn; the alloy can be subjected to modification treatment by adding a trace amount of Sr, so that the strength and the toughness of the material are improved; the addition of La rare earth elements can reduce the hydrogen content and slag content in the melt, achieve the effect of purifying the melt and also play a role in refining grains. As the addition of Zn can cause the coarsening of eutectic Si, the alloy is subjected to modification treatment by adding Sr and rare earth La, and the Sr and the rare earth La have synergistic effect to achieve the purpose of refining crystal grains, thereby improving the comprehensive mechanical property of the alloy.
The heat treatment-free die-casting aluminum-silicon-zinc alloy provided by the invention has the characteristics of high strength and high toughness in a die-casting state, and is suitable for large-scale integrated die-casting parts. In the alloy smelting process, waste aluminum can be added for production, so that the carbon emission is reduced, and the aims of saving energy, reducing emission and reducing production cost are fulfilled.
In order to achieve the purpose, the invention adopts the following technical scheme:
a preparation method of a heat-treatment-free die-casting aluminum-silicon-zinc alloy comprises the following preparation steps:
(1) Preparing in front of a furnace: cleaning the furnace bottom, and then starting to bake the furnace until the furnace wall is red; coating graphite powder on all the operating tools, and then drying and preheating;
(2) Preparing materials: preparing metal Al ingots or waste aluminum, metal Mg ingots, industrial Si, al-Mn intermediate alloy, metal Fe, metal Zn, al-Sr intermediate alloy, metal La and the like as raw materials of each element in the aluminum alloy, and adding the raw materials according to the proportion of the alloy components after properly considering the burning loss;
(3) Charging and melting: firstly, putting metal Al ingots or waste aluminum into a furnace for melting, controlling the melting temperature to be 760-790 ℃, heating after the aluminum ingots or the waste aluminum are completely melted, controlling the temperature to be 760-780 ℃, and then adding industrial silicon, metal Fe, al-Mn intermediate alloy and metal Zn for melting;
(4) Refining and slagging-off: controlling the temperature of the aluminum alloy melt at 740-760 ℃ for uniform stirring, adding a special aluminum alloy refining agent for primary powder injection refining and secondary powder injection refining, controlling the interval time between the two refining processes at 50-60min, skimming after each refining process is finished, and removing the flux and scum on the liquid surface;
(5) Adding other metal elements: when the temperature of the molten liquid is 740-760 ℃, adding metal La, metal Mg and Al-Sr intermediate alloy ingots into the furnace for smelting, refining and modifying, and sampling and analyzing after obtaining an aluminum alloy melt;
(6) And (4) degassing in the furnace. The smelting temperature is kept at 740-760 ℃, the gas is removed from the furnace by gas, the degassing time is about 30-50 min, and then the furnace is kept still for 15-30 min;
(7) Die casting: and after the analysis of the components in front of the furnace is qualified, carrying out high-pressure die casting at the temperature of 690-710 ℃, wherein the injection speed is 5-6 m/s, the vacuum degree is less than 50mbar, and the die temperature is 120-200 ℃, thus obtaining the die casting in a non-heat treatment state.
Compared with the prior art, the invention has the following advantages:
1. the die-casting aluminum silicon zinc alloy prepared by the invention has high strength and high toughness, has good casting performance, can meet the requirement of large-scale integrally-formed die-casting parts of automobiles, and has important industrial application value.
2. Under the non-heat treatment condition, the tensile strength of the heat-treatment-free die-casting aluminum-silicon-zinc alloy prepared by the invention is more than 325MPa, the yield strength is more than 160MPa, and the elongation is more than 12%.
Drawings
FIG. 1 is a metallographic view of a microstructure of a die-cast aluminum alloy obtained in example 6, wherein (a) is a metallographic view of a microstructure at 200X; FIG. (b) is a 500X microstructure metallographic image.
Fig. 2 is a tensile stress strain curve of the die-cast aluminum alloys obtained in example 6, comparative example 7, and comparative example 8.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist the person skilled in the art to further understand the invention, but do not limit it in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
Example 1
The heat treatment-free die-casting aluminum-silicon-zinc alloy comprises the following components in percentage by weight: si:7.14 percent; zn:0.34 percent; fe:0.27 percent; mg:0.54 percent; mn:0.57 percent; la:0.04 percent; sr:0.042 percent and the balance of Al.
The preparation method of the heat-treatment-free die-casting aluminum-silicon-zinc alloy comprises the following steps:
(1) Preparing in front of the furnace: cleaning the furnace bottom, and then starting to dry the furnace until the furnace wall is red; coating graphite powder on all the operating tools, and then drying and preheating;
(2) Preparing materials: preparing metal Al ingots or waste aluminum, metal Mg ingots, industrial Si, al-Mn intermediate alloy, metal Fe, metal Zn, al-Sr intermediate alloy, metal La and the like as raw materials of each element in the aluminum alloy, and adding the raw materials according to the proportion of the alloy components after properly considering the burning loss;
(3) Charging and melting: firstly, putting metal Al ingots or waste aluminum into a furnace for melting, controlling the melting temperature to be 760-790 ℃, heating after the aluminum ingots or the waste aluminum are completely melted, controlling the temperature to be 760-780 ℃, and then adding industrial silicon, metal Fe, al-Mn intermediate alloy and metal Zn for melting;
(4) Refining and slagging off: controlling the temperature of the aluminum alloy melt at 740-760 ℃ for uniform stirring, adding a special aluminum alloy refining agent for primary powder injection refining and secondary powder injection refining, controlling the interval time between the two refining processes at 50-60min, skimming after each refining process is finished, and removing the flux and scum on the liquid surface;
(5) Adding other metal elements: when the temperature of the molten liquid is 740-760 ℃, adding metal La, metal Mg and Al-Sr intermediate alloy ingots into the furnace for smelting, refining and modifying, and sampling and analyzing after obtaining an aluminum alloy melt;
(6) And (4) degassing in the furnace. The smelting temperature is kept at 740-760 ℃, the gas is removed from the furnace by gas, the degassing time is about 30-50 min, and then the furnace is kept still for 15-30 min;
(7) Die casting: and after the analysis of the components in front of the furnace is qualified, carrying out high-pressure die casting at the temperature of 690-710 ℃, wherein the injection speed is 5-6 m/s, the vacuum degree is less than 50mbar, and the die temperature is 120-200 ℃, thus obtaining the die casting in a non-heat treatment state.
Example 2
The heat treatment-free die-casting aluminum-silicon-zinc alloy comprises the following components in percentage by weight: si:7.23 percent; zn:0.42 percent; fe:0.25 percent; mg:0.51 percent; mn:0.64 percent; la:0.05 percent; sr:0.043 percent and the balance of Al.
The preparation method of the heat-treatment-free die-casting aluminum-silicon-zinc alloy comprises the following steps:
(1) Preparing in front of the furnace: cleaning the furnace bottom, and then starting to dry the furnace until the furnace wall is red; coating graphite powder on all the operating tools, and then drying and preheating;
(2) Preparing materials: preparing metal Al ingots or waste aluminum, metal Mg ingots, industrial Si, al-Mn intermediate alloy, metal Fe, metal Zn, al-Sr intermediate alloy, metal La and the like as raw materials of each element in the aluminum alloy, and adding the raw materials according to the proportion of the alloy components after properly considering the burning loss;
(3) Charging and melting: firstly, putting metal Al ingots or waste aluminum into a furnace for melting, controlling the melting temperature to be 760-790 ℃, heating after the aluminum ingots or the waste aluminum are completely melted, controlling the temperature to be 760-780 ℃, and then adding industrial silicon, metal Fe, al-Mn intermediate alloy and metal Zn for melting;
(4) Refining and slagging off: controlling the temperature of the aluminum alloy melt at 740-760 ℃ for uniform stirring, adding a special aluminum alloy refining agent for primary powder spraying refining and secondary powder spraying refining, controlling the interval time between the two refining within 50-60min, skimming after each refining, and removing the flux and scum on the liquid surface;
(5) Adding other metal elements: when the temperature of the molten liquid is 740-760 ℃, adding metal La, metal Mg and Al-Sr intermediate alloy ingots into the furnace for smelting, refining and modifying, and sampling and analyzing after obtaining an aluminum alloy melt;
(6) And (5) degassing in the furnace. The smelting temperature is kept at 740-760 ℃, the gas is removed from the furnace by gas, the degassing time is about 30-50 min, and then the furnace is kept still for 15-30 min;
(7) Die casting: and after the analysis of the components in front of the furnace is qualified, carrying out high-pressure die casting at the temperature of 690-710 ℃, wherein the injection speed is 5-6 m/s, the vacuum degree is less than 50mbar, and the die temperature is 120-200 ℃, thus obtaining the die casting in a non-heat treatment state.
Example 3
The heat treatment-free die-casting aluminum-silicon-zinc alloy comprises the following components in percentage by weight: si:7.29 percent; zn:0.74 percent; fe:0.21 percent; mg:0.39 percent; mn:0.71 percent; la:0.08%; sr:0.044 percent and the balance of Al.
The preparation method of the heat-treatment-free die-casting aluminum-silicon-zinc alloy comprises the following steps:
(1) Preparing in front of the furnace: cleaning the furnace bottom, and then starting to bake the furnace until the furnace wall is red; coating graphite powder on all the operating tools, and then drying and preheating;
(2) Preparing materials: preparing metal Al ingots or waste aluminum, metal Mg ingots, industrial Si, al-Mn intermediate alloy, metal Fe, metal Zn, al-Sr intermediate alloy, metal La and the like as raw materials of each element in the aluminum alloy, and adding the raw materials according to the proportion of the alloy components after properly considering the burning loss;
(3) Charging and melting: firstly, putting metal Al ingots or waste aluminum into a furnace for melting, controlling the melting temperature to be 760-790 ℃, heating after the aluminum ingots or the waste aluminum are completely melted, controlling the temperature to be 760-780 ℃, and then adding industrial silicon, metal Fe, al-Mn intermediate alloy and metal Zn for melting;
(4) Refining and slagging off: controlling the temperature of the aluminum alloy melt at 740-760 ℃ for uniform stirring, adding a special aluminum alloy refining agent for primary powder injection refining and secondary powder injection refining, controlling the interval time between the two refining processes at 50-60min, skimming after each refining process is finished, and removing the flux and scum on the liquid surface;
(5) Adding other metal elements: when the temperature of the molten liquid is 740-760 ℃, adding metal La, metal Mg and Al-Sr intermediate alloy ingots into the furnace for smelting, refining and modifying, and sampling and analyzing after obtaining an aluminum alloy melt;
(6) And (5) degassing in the furnace. Keeping the smelting temperature at 740-760 ℃, degassing in the furnace by using gas for about 30-50 min, and then standing for 15-30 min;
(7) Die casting: and after the stokehole components are qualified by analysis, performing high-pressure die casting at the temperature of 690-710 ℃ of the aluminum liquid, wherein the injection speed is 5-6 m/s, the vacuum degree is less than 50mbar, and the die temperature is 120-200 ℃ to obtain a die casting in a non-heat treatment state.
Example 4
The heat treatment-free die-casting aluminum-silicon-zinc alloy comprises the following components in percentage by weight: si:7.34 percent; zn:0.83 percent; fe:0.20 percent; mg:0.34 percent; mn:0.68 percent; la:0.07 percent; sr:0.045%, and the balance being Al.
The preparation method of the heat-treatment-free die-casting aluminum-silicon-zinc alloy comprises the following steps:
(1) Preparing in front of a furnace: cleaning the furnace bottom, and then starting to dry the furnace until the furnace wall is red; coating graphite powder on all the operating tools, and then drying and preheating;
(2) Preparing materials: preparing metal Al ingots or waste aluminum, metal Mg ingots, industrial Si, al-Mn intermediate alloy, metal Fe, metal Zn, al-Sr intermediate alloy, metal La and the like as raw materials of each element in the aluminum alloy, and adding the raw materials according to the proportion of the alloy components after properly considering the burning loss;
(3) Charging and melting: firstly, putting metal Al ingots or waste aluminum into a furnace for melting, controlling the melting temperature to be 760-790 ℃, heating after the aluminum ingots or the waste aluminum are completely melted, controlling the temperature to be 760-780 ℃, and then adding industrial silicon, metal Fe, al-Mn intermediate alloy and metal Zn for melting;
(4) Refining and slagging-off: controlling the temperature of the aluminum alloy melt at 740-760 ℃ for uniform stirring, adding a special aluminum alloy refining agent for primary powder injection refining and secondary powder injection refining, controlling the interval time between the two refining processes at 50-60min, skimming after each refining process is finished, and removing the flux and scum on the liquid surface;
(5) Adding other metal elements: when the temperature of the molten liquid is 740-760 ℃, adding metal La, metal Mg and Al-Sr intermediate alloy ingots into the furnace for smelting, refining and modifying, and sampling and analyzing after obtaining an aluminum alloy melt;
(6) And (4) degassing in the furnace. The smelting temperature is kept at 740-760 ℃, the gas is removed from the furnace by gas, the degassing time is about 30-50 min, and then the furnace is kept still for 15-30 min;
(7) Die casting: and after the stokehole components are qualified by analysis, performing high-pressure die casting at the temperature of 690-710 ℃ of the aluminum liquid, wherein the injection speed is 5-6 m/s, the vacuum degree is less than 50mbar, and the die temperature is 120-200 ℃ to obtain a die casting in a non-heat treatment state.
Example 5
The heat treatment-free die-casting aluminum-silicon-zinc alloy comprises the following components in percentage by weight: si:7.45 percent; zn:0.91 percent; fe:0.17 percent; mg:0.26 percent; mn:0.60 percent; la:0.06 percent; sr:0.045%, and the balance being Al.
The preparation method of the heat-treatment-free die-casting aluminum-silicon-zinc alloy comprises the following steps:
(1) Preparing in front of the furnace: cleaning the furnace bottom, and then starting to bake the furnace until the furnace wall is red; coating graphite powder on all the operating tools, and then drying and preheating;
(2) Preparing materials: preparing metal Al ingots or waste aluminum, metal Mg ingots, industrial Si, al-Mn intermediate alloy, metal Fe, metal Zn, al-Sr intermediate alloy, metal La and the like as raw materials of each element in the aluminum alloy, and adding the raw materials according to the proportion of the alloy components after properly considering the burning loss;
(3) Charging and melting: firstly, putting metal Al ingots or waste aluminum into a furnace for melting, controlling the melting temperature to be 760-790 ℃, heating after the aluminum ingots or the waste aluminum are completely melted, controlling the temperature to be 760-780 ℃, and then adding industrial silicon, metal Fe, al-Mn intermediate alloy and metal Zn for melting;
(4) Refining and slagging-off: controlling the temperature of the aluminum alloy melt at 740-760 ℃ for uniform stirring, adding a special aluminum alloy refining agent for primary powder injection refining and secondary powder injection refining, controlling the interval time between the two refining processes at 50-60min, skimming after each refining process is finished, and removing the flux and scum on the liquid surface;
(5) Adding other metal elements: when the temperature of the molten liquid is 740-760 ℃, adding metal La, metal Mg and Al-Sr intermediate alloy ingots into the furnace for smelting, refining and modifying, and sampling and analyzing after obtaining an aluminum alloy melt;
(6) And (5) degassing in the furnace. Keeping the smelting temperature at 740-760 ℃, degassing in the furnace by using gas for about 30-50 min, and then standing for 15-30 min;
(7) Die casting: and after the stokehole components are qualified by analysis, performing high-pressure die casting at the temperature of 690-710 ℃ of the aluminum liquid, wherein the injection speed is 5-6 m/s, the vacuum degree is less than 50mbar, and the die temperature is 120-200 ℃ to obtain a die casting in a non-heat treatment state.
Example 6
The heat treatment-free die-casting aluminum-silicon-zinc alloy comprises the following components in percentage by weight: si:7.54 percent; zn:0.62 percent; fe:0.22 percent; mg:0.40 percent; mn:0.65 percent; la:0.06 percent; sr:0.045% and the balance of Al.
The preparation method of the heat-treatment-free die-casting aluminum-silicon-zinc alloy comprises the following steps:
(1) Preparing in front of the furnace: cleaning the furnace bottom, and then starting to bake the furnace until the furnace wall is red; coating graphite powder on all the operating tools, and then drying and preheating;
(2) Preparing materials: preparing metal Al ingots or waste aluminum, metal Mg ingots, industrial Si, al-Mn intermediate alloy, metal Fe, metal Zn, al-Sr intermediate alloy, metal La and the like as raw materials of each element in the aluminum alloy, and adding the raw materials according to the proportion of the alloy components after properly considering the burning loss;
(3) Charging and melting: firstly, putting metal Al ingots or waste aluminum into a furnace for melting, controlling the melting temperature to be 760-790 ℃, heating after the aluminum ingots or the waste aluminum are completely melted, controlling the temperature to be 760-780 ℃, and then adding industrial silicon, metal Fe, al-Mn intermediate alloy and metal Zn for melting;
(4) Refining and slagging-off: controlling the temperature of the aluminum alloy melt at 740-760 ℃ for uniform stirring, adding a special aluminum alloy refining agent for primary powder spraying refining and secondary powder spraying refining, controlling the interval time between the two refining within 50-60min, skimming after each refining, and removing the flux and scum on the liquid surface;
(5) Adding other metal elements: when the temperature of the molten liquid is 740-760 ℃, adding metal La, metal Mg and Al-Sr intermediate alloy ingots into the furnace for smelting, refining and modifying, and sampling and analyzing after obtaining an aluminum alloy melt;
(6) And (5) degassing in the furnace. Keeping the smelting temperature at 740-760 ℃, degassing in the furnace by using gas for about 30-50 min, and then standing for 15-30 min;
(7) Die casting: and after the stokehole components are qualified by analysis, performing high-pressure die casting at the temperature of 690-710 ℃ of the aluminum liquid, wherein the injection speed is 5-6 m/s, the vacuum degree is less than 50mbar, and the die temperature is 120-200 ℃ to obtain a die casting in a non-heat treatment state.
Example 7
The heat treatment-free die-casting aluminum-silicon-zinc alloy comprises the following components in percentage by weight: si:7.58 percent; zn:0.34 percent; fe:0.27 percent; mg:0.54 percent; mn:0.65 percent; la:0.07 percent; sr:0.046 percent and the balance of Al.
The preparation method of the heat-treatment-free die-casting aluminum-silicon-zinc alloy comprises the following steps:
(1) Preparing in front of the furnace: cleaning the furnace bottom, and then starting to dry the furnace until the furnace wall is red; coating graphite powder on all the operating tools, and then drying and preheating;
(2) Preparing materials: preparing metal Al ingots or waste aluminum, metal Mg ingots, industrial Si, al-Mn intermediate alloy, metal Fe, metal Zn, al-Sr intermediate alloy, metal La and the like as raw materials of each element in the aluminum alloy, and adding the raw materials according to the proportion of the alloy components after properly considering the burning loss;
(3) Charging and melting: firstly, putting metal Al ingots or waste aluminum into a furnace for melting, controlling the melting temperature to be 760-790 ℃, heating after the aluminum ingots or the waste aluminum are completely melted, controlling the temperature to be 760-780 ℃, and then adding industrial silicon, metal Fe, al-Mn intermediate alloy and metal Zn for melting;
(4) Refining and slagging off: controlling the temperature of the aluminum alloy melt at 740-760 ℃ for uniform stirring, adding a special aluminum alloy refining agent for primary powder injection refining and secondary powder injection refining, controlling the interval time between the two refining processes at 50-60min, skimming after each refining process is finished, and removing the flux and scum on the liquid surface;
(5) Adding other metal elements: when the temperature of the molten liquid is 740-760 ℃, adding metal La, metal Mg and Al-Sr intermediate alloy ingots into the furnace for smelting, refining and modifying, and sampling and analyzing after obtaining an aluminum alloy melt;
(6) And (5) degassing in the furnace. The smelting temperature is kept at 740-760 ℃, the gas is removed from the furnace by gas, the degassing time is about 30-50 min, and then the furnace is kept still for 15-30 min;
(7) Die casting: and after the analysis of the components in front of the furnace is qualified, carrying out high-pressure die casting at the temperature of 690-710 ℃, wherein the injection speed is 5-6 m/s, the vacuum degree is less than 50mbar, and the die temperature is 120-200 ℃, thus obtaining the die casting in a non-heat treatment state.
Example 8
The heat treatment-free die-casting aluminum-silicon-zinc alloy comprises the following components in percentage by weight: si:7.63 percent; zn:0.42 percent; fe:0.25 percent; mg:0.43 percent; mn:0.68 percent; la:0.08%; sr:0.047 percent and the balance of Al.
The preparation method of the heat-treatment-free die-casting aluminum-silicon-zinc alloy comprises the following steps:
(1) Preparing in front of the furnace: cleaning the furnace bottom, and then starting to bake the furnace until the furnace wall is red; coating graphite powder on all the operating tools, and then drying and preheating;
(2) Preparing materials: preparing metal Al ingots or waste aluminum, metal Mg ingots, industrial Si, al-Mn intermediate alloy, metal Fe, metal Zn, al-Sr intermediate alloy, metal La and the like as raw materials of each element in the aluminum alloy, and adding the raw materials according to the proportion of the alloy components after properly considering the burning loss;
(3) Charging and melting: firstly, putting metal Al ingots or waste aluminum into a furnace for melting, controlling the melting temperature to be 760-790 ℃, heating after the aluminum ingots or the waste aluminum are completely melted, controlling the temperature to be 760-780 ℃, and then adding industrial silicon, metal Fe, al-Mn intermediate alloy and metal Zn for melting;
(4) Refining and slagging-off: controlling the temperature of the aluminum alloy melt at 740-760 ℃ for uniform stirring, adding a special aluminum alloy refining agent for primary powder injection refining and secondary powder injection refining, controlling the interval time between the two refining processes at 50-60min, skimming after each refining process is finished, and removing the flux and scum on the liquid surface;
(5) Adding other metal elements: when the temperature of the molten liquid is 740-760 ℃, adding metal La, metal Mg and Al-Sr intermediate alloy ingots into the furnace for smelting, refining and modifying, and sampling and analyzing after obtaining an aluminum alloy melt;
(6) And (4) degassing in the furnace. Keeping the smelting temperature at 740-760 ℃, degassing in the furnace by using gas for about 30-50 min, and then standing for 15-30 min;
(7) Die casting: and after the stokehole components are qualified by analysis, performing high-pressure die casting at the temperature of 690-710 ℃ of the aluminum liquid, wherein the injection speed is 5-6 m/s, the vacuum degree is less than 50mbar, and the die temperature is 120-200 ℃ to obtain a die casting in a non-heat treatment state.
Example 9
The heat treatment-free die-casting aluminum-silicon-zinc alloy comprises the following components in percentage by weight: si:7.67 percent; zn:0.74 percent; fe:0.18 percent; mg:0.31 percent; mn:0.63%; la:0.09%; sr:0.044 percent and the balance of Al.
The preparation method of the heat-treatment-free die-casting aluminum-silicon-zinc alloy comprises the following steps:
(1) Preparing in front of a furnace: cleaning the furnace bottom, and then starting to bake the furnace until the furnace wall is red; coating graphite powder on all the operating tools, and then drying and preheating;
(2) Preparing materials: preparing metal Al ingots or waste aluminum, metal Mg ingots, industrial Si, al-Mn intermediate alloy, metal Fe, metal Zn, al-Sr intermediate alloy, metal La and the like as raw materials of each element in the aluminum alloy, and adding the raw materials according to the proportion of the alloy components after properly considering the burning loss;
(3) Charging and melting: firstly, putting metal Al ingots or waste aluminum into a furnace for melting, controlling the melting temperature to be 760-790 ℃, raising the temperature after the aluminum ingots or the waste aluminum are completely melted, controlling the temperature to be 760-780 ℃, and then adding industrial silicon, metal Fe, al-Mn intermediate alloy and metal Zn for melting;
(4) Refining and slagging-off: controlling the temperature of the aluminum alloy melt at 740-760 ℃ for uniform stirring, adding a special aluminum alloy refining agent for primary powder spraying refining and secondary powder spraying refining, controlling the interval time between the two refining within 50-60min, skimming after each refining, and removing the flux and scum on the liquid surface;
(5) Adding other metal elements: when the temperature of the molten liquid is 740-760 ℃, adding metal La, metal Mg and Al-Sr intermediate alloy ingots into the furnace for smelting, refining and modifying, and sampling and analyzing after obtaining an aluminum alloy melt;
(6) And (5) degassing in the furnace. The smelting temperature is kept at 740-760 ℃, the gas is removed from the furnace by gas, the degassing time is about 30-50 min, and then the furnace is kept still for 15-30 min;
(7) Die casting: and after the analysis of the components in front of the furnace is qualified, carrying out high-pressure die casting at the temperature of 690-710 ℃, wherein the injection speed is 5-6 m/s, the vacuum degree is less than 50mbar, and the die temperature is 120-200 ℃, thus obtaining the die casting in a non-heat treatment state.
Example 10
The heat treatment-free die-casting aluminum-silicon-zinc alloy comprises the following components in percentage by weight: si:7.74 percent; zn:0.83 percent; fe:0.21%; mg:0.28 percent; mn:0.72 percent; la:0.08 percent; sr:0.046 percent and the balance of Al.
The preparation method of the heat-treatment-free die-casting aluminum-silicon-zinc alloy comprises the following steps:
(1) Preparing in front of a furnace: cleaning the furnace bottom, and then starting to bake the furnace until the furnace wall is red; coating graphite powder on all the operating tools, and then drying and preheating;
(2) Preparing materials: preparing metal Al ingots or waste aluminum, metal Mg ingots, industrial Si, al-Mn intermediate alloy, metal Fe, metal Zn, al-Sr intermediate alloy, metal La and the like as raw materials of each element in the aluminum alloy, and adding the raw materials according to the proportion of the alloy components after properly considering the burning loss;
(3) Charging and melting: firstly, putting metal Al ingots or waste aluminum into a furnace for melting, controlling the melting temperature to be 760-790 ℃, raising the temperature after the aluminum ingots or the waste aluminum are completely melted, controlling the temperature to be 760-780 ℃, and then adding industrial silicon, metal Fe, al-Mn intermediate alloy and metal Zn for melting;
(4) Refining and slagging-off: controlling the temperature of the aluminum alloy melt at 740-760 ℃ for uniform stirring, adding a special aluminum alloy refining agent for primary powder injection refining and secondary powder injection refining, controlling the interval time between the two refining processes at 50-60min, skimming after each refining process is finished, and removing the flux and scum on the liquid surface;
(5) Adding other metal elements: when the temperature of the molten liquid is 740-760 ℃, adding metal La, metal Mg and Al-Sr intermediate alloy ingots into the furnace for smelting, refining and modifying, and sampling and analyzing after obtaining an aluminum alloy melt;
(6) And (5) degassing in the furnace. Keeping the smelting temperature at 740-760 ℃, degassing in the furnace by using gas for about 30-50 min, and then standing for 15-30 min;
(7) Die casting: and after the stokehole components are qualified by analysis, performing high-pressure die casting at the temperature of 690-710 ℃ of the aluminum liquid, wherein the injection speed is 5-6 m/s, the vacuum degree is less than 50mbar, and the die temperature is 120-200 ℃ to obtain a die casting in a non-heat treatment state.
Example 11
The heat treatment-free die-casting aluminum-silicon-zinc alloy comprises the following components in percentage by weight: si:7.85 percent; zn:0.54 percent; fe:0.26 percent; mg:0.45 percent; mn:0.65 percent; la:0.06 percent; sr:0.045% and the balance of Al.
The preparation method of the heat-treatment-free die-casting aluminum-silicon-zinc alloy comprises the following steps:
(1) Preparing in front of the furnace: cleaning the furnace bottom, and then starting to bake the furnace until the furnace wall is red; coating graphite powder on all the operating tools, and then drying and preheating;
(2) Preparing materials: preparing metal Al ingots or waste aluminum, metal Mg ingots, industrial Si, al-Mn intermediate alloy, metal Fe, metal Zn, al-Sr intermediate alloy, metal La and the like as raw materials of each element in the aluminum alloy, and adding the raw materials according to the proportion of the alloy components after properly considering the burning loss;
(3) Charging and melting: firstly, putting metal Al ingots or waste aluminum into a furnace for melting, controlling the melting temperature to be 760-790 ℃, heating after the aluminum ingots or the waste aluminum are completely melted, controlling the temperature to be 760-780 ℃, and then adding industrial silicon, metal Fe, al-Mn intermediate alloy and metal Zn for melting;
(4) Refining and slagging-off: controlling the temperature of the aluminum alloy melt at 740-760 ℃ for uniform stirring, adding a special aluminum alloy refining agent for primary powder spraying refining and secondary powder spraying refining, controlling the interval time between the two refining within 50-60min, skimming after each refining, and removing the flux and scum on the liquid surface;
(5) Adding other metal elements: when the temperature of the molten liquid is 740-760 ℃, adding metal La, metal Mg and Al-Sr intermediate alloy ingots into the furnace for smelting, refining and modifying, and sampling and analyzing after obtaining an aluminum alloy melt;
(6) And (5) degassing in the furnace. Keeping the smelting temperature at 740-760 ℃, degassing in the furnace by using gas for about 30-50 min, and then standing for 15-30 min;
(7) Die casting: and after the analysis of the components in front of the furnace is qualified, carrying out high-pressure die casting at the temperature of 690-710 ℃, wherein the injection speed is 5-6 m/s, the vacuum degree is less than 50mbar, and the die temperature is 120-200 ℃, thus obtaining the die casting in a non-heat treatment state.
Example 12
The heat treatment-free die-casting aluminum-silicon-zinc alloy comprises the following components in percentage by weight: si:7.94 percent; zn:0.91 percent; fe:0.17 percent; mg:0.26 percent; mn:0.73 percent; la:0.07 percent; sr:0.048 percent and the balance of Al.
The preparation method of the heat-treatment-free die-casting aluminum-silicon-zinc alloy comprises the following steps:
(1) Preparing in front of the furnace: cleaning the furnace bottom, and then starting to bake the furnace until the furnace wall is red; coating graphite powder on all the operating tools, and then drying and preheating;
(2) Preparing materials: preparing metal Al ingots or waste aluminum, metal Mg ingots, industrial Si, al-Mn intermediate alloy, metal Fe, metal Zn, al-Sr intermediate alloy, metal La and the like as raw materials of each element in the aluminum alloy, and adding the raw materials according to the proportion of the alloy components after properly considering the burning loss;
(3) Charging and melting: firstly, putting metal Al ingots or waste aluminum into a furnace for melting, controlling the melting temperature to be 760-790 ℃, raising the temperature after the aluminum ingots or the waste aluminum are completely melted, controlling the temperature to be 760-780 ℃, and then adding industrial silicon, metal Fe, al-Mn intermediate alloy and metal Zn for melting;
(4) Refining and slagging off: controlling the temperature of the aluminum alloy melt at 740-760 ℃ for uniform stirring, adding a special aluminum alloy refining agent for primary powder spraying refining and secondary powder spraying refining, controlling the interval time between the two refining within 50-60min, skimming after each refining, and removing the flux and scum on the liquid surface;
(5) Adding other metal elements: when the temperature of the molten liquid is 740-760 ℃, adding metal La, metal Mg and Al-Sr intermediate alloy ingots into the furnace for smelting, refining and modifying, and sampling and analyzing after obtaining an aluminum alloy melt;
(6) And (4) degassing in the furnace. The smelting temperature is kept at 740-760 ℃, the gas is removed from the furnace by gas, the degassing time is about 30-50 min, and then the furnace is kept still for 15-30 min;
(7) Die casting: and after the stokehole components are qualified by analysis, performing high-pressure die casting at the temperature of 690-710 ℃ of the aluminum liquid, wherein the injection speed is 5-6 m/s, the vacuum degree is less than 50mbar, and the die temperature is 120-200 ℃ to obtain a die casting in a non-heat treatment state.
Comparative example 1
The comparative example is adjusted on the basis of the components of example 2, the Zn content is reduced on the basis of example 2, and the weight percentages of the components are as follows: si:7.23 percent; zn:0.12 percent; fe:0.25 percent; mg:0.51 percent; mn:0.64 percent; la:0.05 percent; sr:0.043 percent and the balance of Al.
The preparation method of the heat-treatment-free die-casting aluminum-silicon-zinc alloy comprises the following steps:
(1) Preparing in front of the furnace: cleaning the furnace bottom, and then starting to bake the furnace until the furnace wall is red; coating graphite powder on all the operating tools, and then drying and preheating;
(2) Preparing materials: preparing metal Al ingots or waste aluminum, metal Mg ingots, industrial Si, al-Mn intermediate alloy, metal Fe, metal Zn, al-Sr intermediate alloy, metal La and the like as raw materials of each element in the aluminum alloy, and adding the raw materials according to the proportion of the alloy components after properly considering the burning loss;
(3) Charging and melting: firstly, putting metal Al ingots or waste aluminum into a furnace for melting, controlling the melting temperature to be 760-790 ℃, heating after the aluminum ingots or the waste aluminum are completely melted, controlling the temperature to be 760-780 ℃, and then adding industrial silicon, metal Fe, al-Mn intermediate alloy and metal Zn for melting;
(4) Refining and slagging-off: controlling the temperature of the aluminum alloy melt at 740-760 ℃ for uniform stirring, adding a special aluminum alloy refining agent for primary powder injection refining and secondary powder injection refining, controlling the interval time between the two refining processes at 50-60min, skimming after each refining process is finished, and removing the flux and scum on the liquid surface;
(5) Adding other metal elements: when the temperature of the molten liquid is 740-760 ℃, adding metal La, metal Mg and Al-Sr intermediate alloy ingots into the furnace for smelting, refining and modifying, and sampling and analyzing after obtaining an aluminum alloy melt;
(6) And (5) degassing in the furnace. The smelting temperature is kept at 740-760 ℃, the gas is removed from the furnace by gas, the degassing time is about 30-50 min, and then the furnace is kept still for 15-30 min;
(7) Die casting: and after the stokehole components are qualified by analysis, performing high-pressure die casting at the temperature of 690-710 ℃ of the aluminum liquid, wherein the injection speed is 5-6 m/s, the vacuum degree is less than 50mbar, and the die temperature is 120-200 ℃ to obtain a die casting in a non-heat treatment state.
Comparative example 2
The comparative example is adjusted on the basis of the components of example 2, the Zn content is increased on the basis of example 2, and the weight percentage of each component is as follows: si:7.23 percent; zn:1.56 percent; fe:0.25 percent; mg:0.51 percent; mn:0.64 percent; la:0.05 percent; sr:0.043 percent and the balance of Al.
The comparative example was prepared in the same manner as comparative example 1.
Comparative example 3
The comparative example is an adjustment made on the basis of the components of example 4, and compared with example 4, sr and La elements are not added in the comparative example, and the weight percentages of the components are as follows: si:7.34 percent; zn:0.83 percent; fe:0.20 percent; mg:0.34 percent; mn:0.68 percent and the balance of Al.
The comparative example was prepared in the same manner as comparative example 1.
Comparative example 4
The comparative example is the adjustment based on the components of the example 4, compared with the example 4, the comparative example does not add Sr element, and the weight percentage of each component is as follows: si:7.34 percent; zn:0.83 percent; fe:0.20 percent; mg:0.34 percent; mn:0.68 percent; la:0.07, and the balance of Al.
The comparative example was prepared in the same manner as comparative example 1.
Comparative example 5
The comparative example is adjusted on the basis of the components of the example 10, and compared with the example 10, the comparative example reduces the Zn content to 0.12 percent, and the weight percentages of the components are as follows: si:7.74 percent; zn:0.12 percent; fe:0.21 percent; mg:0.28 percent; mn:0.72 percent; sr:0.046 percent; la:0.08 percent and the balance of Al.
The comparative example was prepared in the same manner as comparative example 1.
Comparative example 6
The comparative example is adjusted on the basis of the components of the example 10, compared with the example 10, the comparative example reduces the Zn content to 0.12%, does not add La element, and comprises the following components in percentage by weight: si:7.74 percent; zn:0.12 percent; fe:0.21%; mg:0.28 percent; mn:0.72 percent; sr:0.046 percent and the balance of Al.
Comparative example 7
The comparative example designs a low-Si, low-Zn and low-Fe aluminum alloy, which comprises the following components in percentage by weight: si:6.5 percent; zn:0.12 percent; fe:0.1 percent; mg:0.2 percent; mn:0.65 percent; sr:0.045%; la:0.06 percent and the balance of Al.
Comparative example 8
The comparative example designs a high-Si, low-Zn and low-Fe aluminum alloy, which comprises the following components in percentage by weight: si:8.5 percent; zn:0.12 percent; fe:0.1 percent; mg:0.2 percent; mn:0.65 percent; sr:0.045%; la:0.045% and the balance of Al.
The comparative example was prepared in the same manner as comparative example 1.
Comparative example 9
The comparative example is adjusted on the basis of the components of the example 6, and compared with the example 6, the comparative example improves the content of Fe element, and the weight percentage of each component is as follows: si:7.54 percent; zn:0.62 percent; fe:0.4 percent; mg:0.4 percent; mn:0.65 percent; sr:0.045%; la:0.06 percent and the balance of Al.
Table 1 reports the compositions of the alloys of examples 1 to 12 and comparative examples 1 to 9.
Table 2 reports the mechanical properties of the alloys of examples 1 to 12 and comparative examples 1 to 9.
TABLE 1 alloy compositions
TABLE 2 mechanical Properties of the alloys
| Case(s) | Sample State | Tensile strength/MPa | Yield strength/MPa | Elongation/percent |
| Example 1 | State F | 324 | 165 | 12.3 |
| Example 2 | State F | 329 | 167 | 12.6 |
| Example 3 | State F | 331 | 173 | 13.1 |
| Example 4 | State F | 335 | 169 | 13.5 |
| Example 5 | State F | 339 | 175 | 13.8 |
| Example 6 | State F | 347 | 181 | 14.6 |
| Example 7 | State F | 334 | 168 | 12.4 |
| Example 8 | State F | 342 | 171 | 12.7 |
| Example 9 | State F | 335 | 175 | 14.1 |
| Example 10 | State F | 331 | 179 | 12.9 |
| Example 11 | State F | 328 | 172 | 12.1 |
| Example 12 | State F | 325 | 176 | 12.6 |
| Comparative example 1 | State F | 295 | 136 | 11.2 |
| Comparative example 2 | State F | 314 | 142 | 10.3 |
| Comparative example 3 | State F | 323 | 153 | 6.4 |
| Comparative example 4 | State F | 310 | 149 | 7.1 |
| Comparative example 5 | State F | 301 | 135 | 9.3 |
| Comparative example 6 | State F | 304 | 137 | 8.7 |
| Comparative example 7 | State F | 264 | 125 | 12.9 |
| Comparative example 8 | State F | 303 | 139 | 9.3 |
| Comparative example 9 | State F | 315 | 142 | 9.3 |
As can be seen from tables 1 and 2, in comparison with example 2, the Zn content in comparative example 1 is reduced by 0.3%, the yield strength of the alloy is reduced by 25MPa, and the elongation is reduced by 1.4%; compared with the embodiment 2, the Zn content of the comparative example 2 is far higher than that of the embodiment 2, the Zn content is improved by 1.14 percent, the yield strength of the alloy is reduced by 25MPa, and the elongation is reduced by 2.3 percent; compared with the example 4, the comparative example 3 does not add Sr and La, the yield strength of the alloy is reduced by 16MPa, and the elongation is reduced by 7.1%; compared with the example 4, the comparative example 4 does not add Sr, the yield strength of the alloy is reduced by 20MPa, and the elongation is reduced by 6.4%; compared with the embodiment 10, the comparative example 5 reduces the Zn content to 0.12 percent, simultaneously does not add La element, reduces the yield strength of the alloy by 42MPa and reduces the elongation by 3.6 percent; compared with the example 10, the comparative example 6 reduces the Zn content to 0.12 percent, does not add La element, reduces the yield strength of the alloy by 42MPa and reduces the elongation by 4.2 percent; in addition, comparative example 7 provides an aluminum-silicon alloy having lower Si than that of the present invention, and comparative example 8 provides an aluminum-silicon alloy having higher Si than that of the present invention, and both comparative example 7 and comparative example 8 have lower strength and elongation than those of the present invention in view of mechanical properties. Compared with example 6, the content of Fe in comparative example 9 is increased to 0.4%, the yield strength of the alloy is reduced by 39MPa, and the elongation is reduced by 5.3%. In conclusion, only when the Zn element, the Fe element, the Sr element and the La element are in the patent range, the mechanical property of the alloy can be excellent, when the contents of the Zn element and the Fe element are too low or too high, the comprehensive mechanical property is poorer, and in addition, the Sr element and the rare earth La element are added to greatly improve the comprehensive property of the alloy.
Claims (8)
1. The heat treatment-free die-casting aluminum silicon zinc alloy is characterized in that the die-casting aluminum silicon zinc alloy comprises the following components in percentage by weight:
si:7.14-7.94%; zn:0.34 to 0.91 percent; fe:0.17 to 0.27 percent; mg:0.26 to 0.54 percent; mn:0.57-0.73%; la:0.04-0.09%; sr:0.042-0.048% and the balance of Al.
2. The heat-treatment-free die-casting aluminum silicon zinc alloy as claimed in claim 1, wherein the die-casting aluminum silicon zinc alloy comprises the following components in percentage by weight:
si:7.14-7.54%; zn:0.34 to 0.62 percent; fe:0.22 to 0.27 percent; mg:0.40-0.54%; mn:0.57-0.73%; la:0.04-0.09%; sr:0.042-0.048% and the balance of Al.
3. The heat-treatment-free die-casting aluminum silicon zinc alloy as claimed in claim 1, wherein the die-casting aluminum silicon zinc alloy comprises the following components in percentage by weight:
si:7.14 to 7.54 percent; zn:0.62 to 0.91 percent; fe:0.17 to 0.22 percent; mg:0.26 to 0.40 percent; mn:0.57-0.73%; la:0.04 to 0.09 percent; sr:0.042-0.048% and the balance of Al.
4. The heat-treatment-free die-casting aluminum silicon zinc alloy as claimed in claim 1, wherein the die-casting aluminum silicon zinc alloy comprises the following components in percentage by weight:
si:7.54 to 7.94 percent; zn:0.34 to 0.62 percent; fe:0.22 to 0.27 percent; mg:0.40-0.54%; mn:0.57-0.73%; la:0.04-0.09%; sr:0.042-0.048% and the balance of Al.
5. The heat-treatment-free die-casting aluminum-silicon-zinc alloy as claimed in claim 1, wherein the die-casting aluminum-silicon-zinc alloy comprises the following components in percentage by weight:
si:7.54 to 7.94 percent; zn:0.62 to 0.91 percent; fe:0.17 to 0.22 percent; mg:0.26 to 0.40 percent; mn:0.57-0.73%; la:0.04-0.09%; sr:0.042-0.048% and the balance of Al.
6. The heat-treatment-free die-casting aluminum silicon zinc alloy as claimed in claim 1, wherein the die-casting aluminum silicon zinc alloy comprises the following components in percentage by weight:
si:7.14 percent; zn:0.34 percent; fe:0.27 percent; mg:0.54 percent; mn:0.57 percent; la:0.04 percent; sr:0.042 percent and the balance of Al.
7. The heat-treatment-free die-casting aluminum silicon zinc alloy as claimed in claim 1, wherein the die-casting aluminum silicon zinc alloy comprises the following components in percentage by weight:
si:7.54 percent; zn:0.62 percent; fe:0.22 percent; mg:0.4 percent; mn:0.65 percent; la:0.06 percent; sr:0.045%, and the balance being Al.
8. The heat-treatment-free die-casting aluminum silicon zinc alloy as claimed in claim 1, wherein the die-casting aluminum silicon zinc alloy comprises the following components in percentage by weight:
si:7.94 percent; zn:0.91 percent; fe:0.17 percent; mg:0.26 percent; mn:0.73 percent; la:0.07 percent; sr:0.048 percent and the balance of Al.
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