CN113215453A - Annealing softening resistant high-heat-conductivity corrosion-resistant cast aluminum alloy and preparation method thereof - Google Patents
Annealing softening resistant high-heat-conductivity corrosion-resistant cast aluminum alloy and preparation method thereof Download PDFInfo
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Abstract
The invention belongs to the technical field of aluminum alloy, and discloses an annealing softening resistant high-heat-conductivity corrosion-resistant cast aluminum alloy and a preparation method thereof. The cast aluminum alloy comprises Al, a main component and a trace element component; the contents of the components are as follows by weight percent: the main components are as follows: 6-9% of Si, 0.6-1.0% of Fe, 0.5-1.2% of Mg, 0.2-0.5% of Er and 0.2-0.5% of Y; trace element components: 0.03-0.06% of B, 0.025-0.05% of Ti, 0.0025-0.005% of C, 0.02-0.05% of Sr; the balance being Al. The invention also discloses a preparation method of the aluminum alloy. The invention solves the problem that the heat conduction, the corrosion resistance and the mechanical property of the cast aluminum alloy are mutually restricted, so that the cast aluminum alloy realizes good matching of excellent heat conduction, annealing softening resistance and corrosion resistance.
Description
Technical Field
The invention belongs to the technical field of aluminum alloy, and particularly relates to an annealing softening resistant high-thermal-conductivity corrosion-resistant cast aluminum alloy and a preparation method thereof.
Background
The cast aluminum alloy has the advantages of low density, high specific strength, low cost and the like, wherein the Al-Si alloy has the best casting performance and becomes an important structural material in the industries of automobiles, ships, aviation and the like. The cast Al-Si alloy is also applied to the heat dissipation field, such as housings of various heating devices of communication base station cavities, heat dissipation substrates, consumer electronics, power batteries and the like. With the gradual upgrade of signal frequency, the power of equipment is gradually increased, and higher requirements are put on the heat dissipation capacity of materials. The communication base station is taken as a typical application scene, long-time field service is needed, and a good corrosion-resistant material is needed to protect an equipment substrate. 5G base stations, intercity high-speed rails, rail transit and new energy automobiles are about to meet a great deal of technical innovation, the application potential of the aluminum alloy is exploited, the aluminum alloy with high comprehensive performance is developed, the application space of the aluminum alloy is widened, and the vigorous development of related industries is assisted.
The cast aluminum alloy has two performance aspects in industrial production and scene application, wherein the service performance includes heat conduction performance, mechanical performance, corrosion resistance and the like and needs to meet the use requirement; and the other is the process performance, such as casting fluidity, shrinkage and the like, which is directly related to the production efficiency and the manufacturing cost. Under the background, the development of the cast aluminum alloy material which can realize appropriate mechanical properties, excellent heat conduction and good corrosion resistance matching is of great significance. In actual production, the structure of cast aluminum alloy is often adjusted by matching with heat treatment to reduce internal stress, but the common heat treatment process such as annealing often causes the reduction of the strength and hardness of the alloy, so that the problems of easy knife adhesion, wire sliding, easy deformation and the like in the mechanical processing process are caused, the processing difficulty is increased, and the yield is reduced. Therefore, the development of the high-heat-conductivity corrosion-resistant cast aluminum alloy with annealing softening resistance and the treatment process thereof have important values.
The Chinese invention patent with the application number of 201811481062.3 discloses a high-heat-conductivity high-corrosion-resistance cast aluminum alloy and a preparation method thereof, and the high-heat-conductivity high-corrosion-resistance cast aluminum alloy mainly comprises the following raw materials: 7-9% of Si; 0.6-1.0% Fe; 0.2-0.6% Zn; 0.1-0.5% Co; 0.05 to 0.15 percent of B; 0.2-0.5% RE; 0.05 to 0.2 percent of Sr, and the balance of Al. Wherein RE is Er/La-containing mixed light rare earth. During preparation, firstly, melting the aluminum alloy containing Si, Fe and Co elements at high temperature, standing and cooling; adding pure Zn, Al-RE, Al-B and Al-Sr intermediate alloys into the melt for further alloying; refining and deslagging the melt, and casting and forming. Although the cast aluminum alloy in the patent has the characteristics of high heat conductivity and excellent corrosion resistance, the Co element used in the invention is expensive, and increases the production cost, and more importantly, if the heat conductivity coefficient of the die casting is further improved in actual production, the die casting needs to be annealed at low temperature (the temperature is kept at 220-280 ℃ for 2-4 h). The main alloying element of the alloy is Zn, the re-strengthening effect is weak, particularly, the hardness and the strength of the alloy are obviously reduced due to annealing, the further processing process of a casting is easy to generate sticky knife, the quality of the processed surface is poor, and the problems of wire sliding and the like are generated during tapping processing. How to ensure that the high-thermal-conductivity die-casting aluminum alloy has excellent corrosion resistance and softening resistance and is easy to process is an urgent problem to be solved in a high-thermal-conductivity aluminum alloy casting, and the invention of the high-thermal-conductivity corrosion-resistant casting aluminum alloy with the annealing softening resistance has important practical significance.
Disclosure of Invention
In order to overcome the above disadvantages and shortcomings of the prior art, the present invention aims to provide an annealing softening resistant high thermal conductivity corrosion resistant cast aluminum alloy and a preparation method thereof. The cast aluminum alloy has high heat-conducting property and excellent corrosion resistance, simultaneously meets the mechanical property requirement of application, and avoids hardness reduction after annealing. The cast aluminum alloy is used in the field of heat dissipation, and is particularly suitable for being used as a heat dissipation device of a 5G or other heating device equipment shell.
The purpose of the invention is realized by the following technical scheme:
an annealing softening resistant high-heat-conductivity corrosion-resistant cast aluminum alloy comprises Al, a main component and a trace element component; the contents of the components are as follows by weight percent:
the main components and the contents thereof are as follows:
6～9％Si，0.6～1.0％Fe，0.5～1.2％Mg，0.2～0.5％Er，0.2～0.5％Y；
the trace element components and the contents thereof are as follows:
0.03～0.06％B，0.025～0.05％Ti，0.0025～0.005％C，0.02～0.05％Sr；
the balance being Al.
The preparation method of the annealing softening resistant high-heat-conductivity corrosion-resistant cast aluminum alloy comprises the following steps:
1) melting aluminum alloy: melting aluminum and aluminum alloy containing more than one of Si, Fe and Mg elements, standing and preserving heat to obtain aluminum alloy melt; the aluminum alloy melt contains Si, Fe and Mg elements;
the aluminum alloy containing more than one of Si, Fe and Mg elements is Si-containing aluminum alloy, Fe-containing aluminum alloy and Mg-containing aluminum alloy; preferably Al-20Si, Al-20Fe and Al-10 Mg;
2) treatment of molten boron (B): adding the aluminum alloy containing B into the aluminum alloy melt, carrying out boronization treatment, standing and preserving heat to obtain a boronized aluminum alloy melt; the B-containing aluminum alloy is preferably an Al-3B master alloy;
3) alloying treatment of the melt rare earth: adding more than one aluminum alloy containing Er and Y into the boronized aluminum alloy melt, alloying, standing and cooling to obtain a multi-element aluminum alloy melt; the multi-element aluminum alloy melt contains Er and Y elements;
the preferred aluminum alloy containing more than one of Er and Y is Al-20Er intermediate alloy and Al-20Y intermediate alloy
4) Adding an aluminum titanium carbon refiner into the multi-element aluminum alloy melt, refining the melt, standing and preserving heat to obtain a refined melt;
5) modification treatment of the melt: adding Sr-containing aluminum alloy into the refined melt, modifying, standing and cooling to obtain modified melt;
6) melt refining and deslagging: adding refining agent and deslagging agent into the melt after modification treatment, carrying out refining deslagging treatment, and casting and forming.
And 6) annealing the cast casting formed in the step 6), wherein the annealing temperature is 220-280 ℃, and the annealing time is 2-4 h. The casting molding is casting molding.
The melting temperature in the step 1) is 720-750 ℃; standing and preserving heat for 5-30 min;
and in the step 1), after the aluminum alloy is completely melted, uniformly stirring, and then standing and preserving heat.
The boronizing temperature in the step 2) is 720-750 ℃, and the boronizing time is 2-5 min;
the boronizing treatment is stirring at 720-750 ℃ for 2-5 min;
and (3) standing and heat preservation time in the step 2) is 5-30 min.
The temperature of the alloying treatment in the step 3) is 720-750 ℃, and the time of the alloying treatment is 5-10 min; the alloying treatment is stirring at 720-750 ℃ for 5-10 min.
The standing and cooling means standing and cooling to 700-720 ℃.
The aluminum-titanium-carbon refiner in the step 4) is an Al-5Ti-C refiner; the temperature of the melt refining treatment is 700-720 ℃, and the time of the melt refining treatment is 2-5 min;
the melt refining treatment in the step 4) is stirring for 2-5 min at 700-720 ℃. And (4) standing and heat preservation for 5-30 min.
The Sr-containing aluminum alloy in the step 5) is Al-10Sr intermediate alloy; the temperature of modification treatment is 700-720 ℃, and the time of modification treatment is 2-5 min;
the modification treatment is stirring for 2-5 min at 700-720 ℃;
the standing and cooling means that the temperature is reduced to 680-700 ℃.
The temperature of the refining deslagging treatment in the step 6) is 680-700 ℃.
And 6) adding a refining agent and a deslagging agent, and standing for 4-6 min.
And the refining deslagging is realized by adding YT-J-1 type refining agent and YT-D-4 type deslagging agent by a nitrogen blowing method.
The refining agent and the deslagging agent are common commercial products and are prepared according to the proportion of 1: 1, uniformly mixing, wherein the total adding amount of the refining agent and the deslagging agent is 1 percent of the weight of the melt.
Before adding the aluminum alloy containing B into the aluminum alloy melt in the step 2), removing scum on the surface of the aluminum alloy melt;
and 3) before adding the aluminum alloy containing more than one of Er and Y into the boronized aluminum alloy melt in the step 3), removing floating slag on the surface of the aluminum alloy melt.
And 6) slagging off the melt before casting and molding.
The invention designs and solves the problem that the heat conduction, the corrosion resistance and the mechanical property of the cast aluminum alloy are mutually restricted based on the idea of compound alloying of main components and trace elements, and develops an annealing softening resistant high-heat-conduction corrosion-resistant cast aluminum alloy material. The main components such as Si, Fe, Mg and the like belong to common elements in cast aluminum alloy, the alloy casting and service performance is improved after the main components are added, and the addition of rare earth elements is favorable for purifying a melt and can effectively control the alloy phase form to realize modification and refinement. In addition, Er and Y elements can also improve the electrode potential of the matrix and promote the generation of a dense protective film on the surface of the matrix. The mass fraction of Si in the cast Al-Si alloy is usually 5-22%, and the eutectic point Si content is 12.5%. Si is an important element for increasing the fluidity of the melt, and the closer to the eutectic point, the better the fluidity and the smaller the thermal expansion coefficient. However, the thermal conductivity of the alloy decreases with increasing Si content. Common cast aluminum alloys such as A356 and ADC12, which have thermal conductivities of 133.6W/(m.K) and 105.8W/(m.K), respectively, fail to meet the increasing heat dissipation performance requirements of the 5G era. Fe is a common impurity element in the aluminum alloy, the existence of a proper amount of Fe is beneficial to the demolding of the casting, the formability and the production efficiency of the casting are improved, but Fe can form a long needle-shaped Fe-rich phase in the solidification process of a melt, and the brittle Fe-rich phase and an electrode of an aluminum matrix have potential difference to form a micro battery so as to accelerate the dissolution of the aluminum matrix; on the other hand, the material becomes a crack rapid expansion area, and the material is accelerated to be damaged. The Mg element is partially dissolved in the aluminum matrix to cause lattice distortion, which has a certain influence on the heat conductivity of the alloy. Part of which forms Mg with Si in the alloy2Si phase, and the alloy strength is improved. In the aspect of corrosion resistance, Mg plays two roles in Al-Si alloy, on one hand, more new phases are introduced, the internal phases of the alloy are complicated, and the potential difference of electrodes is enlarged; mg formed on the other hand2Si and Mg3Al is more negative than the potential of the alpha-Al electrode, and is preferentially dissolved as an anode during corrosion, thereby playing the roles of protecting a matrix and improving the corrosion resistance. The trace elements mainly have the functions of purifying melt, refining tissues and improving the uniformity of the tissues. Such as smeltedIn the process, the added B can be combined with common impurities such as Mn, V and the like in the aluminum alloy and is precipitated to the bottom, so that the efficiency of the subsequent rare earth modified alloy is improved. The introduction of C element can increase nucleation core in the solidification process, refine crystal grains and especially play a role in modifying and refining Fe-rich phase. The Sr element is a common modifier in hypoeutectic Al-Si alloy, can modify a eutectic Si phase from a sheet shape to a fiber shape, and has the advantages of long modification effective time, good effect and the like.
Compared with the prior art, the invention has the following outstanding advantages and beneficial effects:
1) according to the invention, the hypoeutectic Al-Si alloy is used as a base material, the heat conductivity and the corrosion resistance are improved by optimizing alloy components and controlling a smelting process, and the purpose that the aluminum alloy material has multiple properties is realized.
2) The alloy can effectively inhibit the as-cast alloy from being annealed and softened, moderately improves the hardness on the premise of greatly improving the thermal conductivity, and realizes the balance of the thermal conductivity and the mechanical property, namely higher hardness and excellent thermal conductivity.
3) The invention fully exerts the multi-component composite modification effect, improves the second phase form and distribution in the alloy, reduces the melt impurities, reduces the potential difference between the matrix and the second phase electrode, improves the thermal conductivity and annealing softening resistance of the alloy, and more obviously improves the corrosion resistance of the alloy, and compared with Al-7Si-0.6Fe-0.5Zn-0.05B-0.15Sr-0.2RE alloy, the corrosion rate is reduced by 95 percent to the maximum.
4) The invention has low cost of raw materials, simple and pollution-free process flow and easy realization of industrial scale production.
Drawings
FIG. 1 is an optical microstructure of an Al-7Si-0.8Fe-0.5Zn alloy in comparative example 1;
FIG. 2 is an optical microstructure diagram of the Al-7Si-0.8Fe-0.6Mg-0.3Y alloy in example 1.
Detailed Description
In order to better illustrate the implementation effect of the invention, Al-7Si-0.8Fe-0.5Zn aluminum alloy is selected as a comparative example, and the preparation process, the structure and the performance characteristics of the invention are illustrated by combining the attached drawings, the examples and the comparative example. The test of the invention comprises a heat conducting performance test, a mechanical performance test and a corrosion resistance test.
Test of Heat conductivity
And (3) measuring the thermal diffusion coefficient by using a Netzsch LFA-457 type laser thermal conductivity tester according to the ASTM E1461 standard, sampling and processing a test sample by using a linear cutting machine, and polishing the surface of the test sample by using sand paper to be smooth and enable the end surface to be parallel. The surface of the sample is cleaned by alcohol and then coated with graphite, so that the infrared emissivity of the surface of the sample and the absorption ratio of the sample to light energy are increased.
The density of the samples was determined according to GB/T1423-19 standard. Sample specific heats were determined according to astm e1269 standard. And (3) calculating according to a formula to obtain the thermal conductivity of the material, wherein the calculation formula is as follows:
λ＝α·ρ·cp
in the formula, lambda is the thermal conductivity of the material, W/(m.K); alpha is the thermal diffusion coefficient of the material, mm2/s；cpIs the specific heat of the material, J/(g.K); rho is the density of the material, g/cm3。
Mechanical Property test
The hardness of the alloy is measured by an XHB-3000Z type Brinell hardness tester according to the GB/T231.1 standard, and relevant parameters are as follows: the applied load was 62.5Kg, the steel ball diameter D was 2.5mm, and the retention time after the pressing of the steel ball was 60 seconds. And 5 points are selected from the test range of the sample surface for testing, the average is calculated after the maximum value and the minimum value are removed, and the average is recorded as a hardness measurement result.
Test of Corrosion resistance
Sampling and processing by using an electric spark numerical control linear cutting machine, drilling, polishing by using abrasive paper, cleaning by using alcohol, and then blowing to dry. Weighing the weight M before corrosion by using an electronic balance with the precision of four digits after decimal point0And 3 parallel samples of each group of alloy are prepared, and the average value is taken to record the result and reduce the experimental error. The test piece is immersed in a corrosive medium, and the experimental setting temperature is 30 ℃. After soaking for 10d, taking out, and removing corrosion products according to GBT 16545-2015 standard. The mass M of the corroded alloy is weighed and is also accurate to four decimal places. Calculating the average corrosion rate v (mg/(em) by weight loss method2D)) and relative corrosion rate. The calculation formula is as follows:
v＝(M0-M)/(S×t)
in the formula: m0 is sample weight before corrosion (mg); m is the weight (mg) of the sample after the corrosion products are removed; s is the total surface area (cm) of the sample2) (ii) a t is the soaking time (d).
Comparative example 1: al-7Si-0.6Fe-0.5Zn-0.05B-0.15Sr-0.2RE alloy and its treatment
This comparative example prepared an alloy according to the alloy disclosed in patent No. 201811481062.3 and its preparation technique. The materials used are commercially pure aluminum, Al-20Si, Al-20Fe, pure zinc, Al-B, Al-Sr and Al-RE master alloys. The alloy comprises the following components in percentage by weight: 7% of Si, 0.6% of Fe, 0.5% of Zn, 0.05% of B, 0.15% of Sr, 0.2% of RE and the balance of Al.
The alloy smelting and preparation process and the parameters thereof are as follows:
(1) and melting the aluminum alloy at a high temperature. The method comprises the following specific steps:
the raw materials are calculated according to the percentage of the components, the weighed industrial pure aluminum, Al-Si and Al-Fe intermediate alloy are melted, the melting temperature is 750 ℃, and the temperature is kept for 10 min.
(2) Alloying the alloy melt. The method comprises the following specific steps:
skimming dross on the surface of the melt, adding pure Zn, Al-RE, Al-B and Al-Sr intermediate alloys into the alloy melt prepared in the step (1), controlling the treatment temperature to be 720 ℃ to prevent excessive burning loss of Zn, manually stirring for 5min to ensure that the components are uniform, standing and preserving heat for 10 min.
(3) And refining and deslagging the melt. And (3) using a commercial YT-J-1 refining agent and YT-D-4 deslagging agent to obtain a melt prepared in the steps of 1: 1, and adding the mixture into the alloy melt by a nitrogen blowing method for refining and deslagging. The addition amount of the refining agent and the deslagging agent is 1 percent of the weight of the alloy melt. And the treatment temperature of refining and deslagging is 680 ℃, standing for 5min, discharging and casting after slagging off to obtain the multielement aluminum alloy melt.
(4) And (5) casting and forming. And (3) forming the melt smelted and treated in the step by using a common gravity casting method, namely casting the melt into a preheated metal mold to prepare a thin-wall casting, and sampling from the cast ingot for detection after cooling.
And sampling from the casting, and carrying out low-temperature annealing treatment by keeping the temperature at 280 ℃ for 4 h.
FIG. 1 is an as-cast optical microstructure of the alloy. The alloy structure mainly comprises a primary alpha-Al phase, a eutectic Si phase and an intermetallic compound. The alloy of this comparative example was measured to have a thermal conductivity of 159.4W/m.K, Brinell hardness of 64.7HB, and a corrosion rate of 0.115mg/cm2D. After annealing, the thermal conductivity is improved to 181.2W/m.K, the Brinell hardness is reduced to 60.8HB, and the corrosion rate is increased to 0.211mg/cm2·d。
The heat conductivity of the alloy of the comparative example can reach 181.2W/(m.K) after annealing, and the requirement of the heat dissipation capacity of the material under the 5G era is met. However, the main strengthening original position in the alloy is Zn, the variety of strengthening elements is less, the content is lower, the mechanical property is poorer, the Brinell hardness is 64.7HB, and particularly, the hardness after annealing is reduced to only 60.8 HB. In addition, the corrosion resistance of the alloy is further reduced after annealing, and the corrosion rate is 0.211mg/cm2D, 1.83 times that before annealing. Therefore, the thermal conductivity of the alloy can be improved by low-temperature annealing, but the mechanical property and the corrosion resistance of the alloy can be obviously reduced, and the comprehensive performance requirements of 5G heat dissipation devices, particularly heat dissipation cavities for outdoor base stations on the thermal conductivity, the corrosion resistance and the mechanical property can not be well met.
Example 1: al-7Si-0.8Fe-0.8Mg-0.3Er-0.3Y alloy and treatment thereof
The materials used in this example were commercially pure Al, Al-20Si, Al-20Fe, Al-10Mg, Al-5Ti-C, Al-20Er, Al-20Y and Al-10Sr master alloys. The composition comprises main components and trace elements, and the main components and the content thereof are as follows by weight percent: 7% of Si, 0.8% of Fe, 0.8% of Mg, 0.3% of Er and 0.3% of Y; the trace element components and the contents thereof are as follows: 0.03% of B, 0.025% of Ti, 0.0025% of C and 0.05% of Sr; the balance being Al.
The smelting and the processing of the alloy of the embodiment comprise the following steps:
(1) melting aluminum alloy: designing alloy components according to performance requirements, taking industrial pure aluminum, Al-20Si, Al-20Fe and Al-10Mg intermediate alloy as raw materials, preparing and melting the aluminum alloy according to target components; controlling the melting temperature at 730 ℃, uniformly stirring for 5min after the alloy is completely melted to obtain an aluminum alloy melt, standing and preserving heat for 20 min;
(2) b, melt B treatment: skimming dross on the surface of the aluminum alloy melt, adding Al-3B intermediate alloy into the alloy melt prepared in the step (1), carrying out B treatment, controlling the treatment temperature at 730 ℃, uniformly stirring for 5min to obtain a B-treated aluminum alloy melt, and standing and preserving heat for 10 min;
(3) alloying treatment of the melt rare earth: skimming dross on the surface of the aluminum alloy melt, adding Al-20Er and Al-20Y intermediate alloy into the aluminum alloy melt melted in the step (2), controlling the treatment temperature at 730 ℃, uniformly stirring for 10min to obtain a multi-element aluminum alloy melt, standing and cooling to 700 ℃;
(4) refining the melt: adding an Al-5Ti-C refiner into the melt treated in the step (3) to carry out melt refining treatment, controlling the treatment temperature at 700 ℃, fully stirring for 5min, standing and preserving heat for 10 min;
(5) modification treatment of the melt: adding Al-10Sr intermediate alloy into the alloy melt obtained in the step (4), controlling the treatment temperature at 700 ℃, uniformly stirring for 2min, standing and cooling to 680 ℃;
(6) melt refining and deslagging: and (4) adding a refining agent and a deslagging agent into the melt processed in the step (5), refining and deslagging, controlling the processing temperature to be 680 ℃, standing for 5min, discharging from the furnace after slagging off, and casting and molding.
After cooling, samples were taken from the ingots for performance and texture analysis. Samples were taken from the castings and were incubated at 240 ℃ for 4h for low temperature annealing, and performance and texture analyses were performed following the same procedure.
FIG. 2 is an as-cast optical microstructure of the alloy. The alloy structure mainly comprises a primary alpha-Al phase, a eutectic Si phase and an intermetallic compound. The element Sr and the refiner Al-5Ti-C refine grains, the rare earth Y modifies an aluminum matrix, and the melt is purified. The crystal grains are more regularly ordered than in comparative example 1. The alloy of this example was measured to have a thermal conductivity of 152.7W/m.K, Brinell hardness of 84.4HB, and a corrosion rate of 0.098mg/cm2D. After annealing, the thermal conductivity is improved to 181.5W/m.K, the Brinell hardness is improved to 91.4HB, and the corrosion rate is reduced to 0.058mg/cm2·d。
The thermal conductivity was slightly lower as-cast by a value of 6.7 units compared to the alloy of comparative example 1. But the strengthening effect of Mg is obvious, the hardness of the alloy in an as-cast state reaches 84.4HB, and is increased by 19.7 unit values and 30.4 percent compared with the alloy in the comparative example 1. The corrosion rate in the as-cast state is 0.098mg/cm2D, lower than in comparative example 1. After annealing, the thermal conductivity of the alloy is improved to be equivalent to that of the alloy in comparative example 1, the hardness is not reduced and reversely increased to reach 91.4HB, and the corrosion rate is reduced to 0.058mg/cm2D. Because Mg element is added in the alloy of the embodiment, the aluminum matrix is well strengthened, the hardness is continuously improved after annealing, and the reliability of the practical use of the material is ensured. Although the thermal conductivity in the as-cast state is different from that of the alloy in the comparative example 1, the thermal conductivity and the alloy are almost the same after annealing, and the corrosion rate is reduced. The heat sink has excellent heat conducting performance and corrosion resistance, simultaneously takes the annealing softening resistance into consideration, and can meet the application requirement of the heat sink under severe use conditions.
Example 2: al-6Si-1Fe-1.0Mg-0.2Er-0.2Y alloy and treatment thereof
The raw materials used were the same as in example 1, except that the raw materials were weighed according to the compounding ratio requirements. The composition of the alloy of this example contains the main components and trace elements in weight percent. Wherein the main components and the contents thereof are as follows: 6% of Si, 1% of Fe, 1% of Mg, 0.2% of Er and 0.2% of Y; the trace element components and the contents thereof are as follows: 0.03% of B, 0.025% of Ti, 0.0025% of C and 0.05% of Sr; the balance being Al.
The smelting process flow of this example is the same as that of example 1, and different process parameters are different.
The specific process comprises the following steps:
(1) melting aluminum alloy: designing alloy components according to performance requirements, taking industrial pure aluminum, Al-20Si, Al-20Fe and Al-10Mg intermediate alloy as raw materials, preparing and melting the aluminum alloy according to target components; controlling the melting temperature at 750 ℃, uniformly stirring for 5min after the alloy is completely melted to obtain an aluminum alloy melt, standing and preserving heat for 20 min;
(2) b, melt B treatment: skimming dross on the surface of the aluminum alloy melt, adding Al-3B intermediate alloy into the alloy melt prepared in the step (1), carrying out B treatment, controlling the treatment temperature at 750 ℃, uniformly stirring for 5min to obtain a B-treated aluminum alloy melt, and standing and preserving heat for 10 min;
(3) alloying treatment of the melt rare earth: skimming dross on the surface of the aluminum alloy melt, adding Al-20Er and Al-20Y intermediate alloy into the aluminum alloy melt melted in the step (2), controlling the treatment temperature at 750 ℃, uniformly stirring for 10min to obtain a multi-element aluminum alloy melt, standing and cooling to 720 ℃;
(4) refining the melt: adding an Al-5Ti-C refiner into the melt treated in the step (3) to carry out melt refining treatment, controlling the treatment temperature at 700 ℃, fully stirring for 5min, standing and preserving heat for 10 min;
(5) modification treatment of the melt: adding Al-10Sr intermediate alloy into the alloy melt obtained in the step (4), controlling the treatment temperature at 700 ℃, uniformly stirring for 2min, standing and cooling to 700 ℃;
(6) melt refining and deslagging: and (4) adding a refining agent and a deslagging agent into the melt processed in the step (5), refining and deslagging, controlling the processing temperature to be 700 ℃, standing for 5min, discharging from the furnace after deslagging, and casting and molding.
After cooling, samples were taken from the ingots for performance and texture analysis. And sampling from the casting, keeping the temperature at 260 ℃ for 4h, carrying out low-temperature annealing treatment, and carrying out performance and structure analysis by following the same method.
The Brinell hardness of the alloy is measured to be 74.3HB, and the Brinell hardness is increased to 78.5HB after annealing, which is 14.8% higher than that of the alloy in the comparative example 1 in an as-cast state, and is 29.1% higher after annealing. The thermal conductivity of the alloy in an as-cast state is 155.5W/(mK), and the thermal conductivity is improved to 178.1W/(mK) after annealing. The corrosion rate in the as-cast state is 0.069mg/cm2D, after annealing, reduced to 0.04mg/cm2D, the corrosion rate after annealing is only 19% of that of the alloy in comparative example 1, and the corrosion resistance is significantly improved. The embodiment greatly improves the corrosion resistance and the annealing softening resistance of the alloy, the thermal conductivity after annealing can still meet the requirement of high-performance heat conduction materials, the corrosion resistance and the mechanical property of the alloy are synchronously improved, and the cast aluminum alloy with excellent thermal conductivity, corrosion resistance and mechanical property is obtained.
Example 3: AI-9Si-0.8Fe-0.6Mg-0.2Er-0.4Y alloy and treatment thereof
The raw materials used were the same as in example 1, except that the raw materials were weighed according to the compounding ratio requirements. The composition of the alloy of this example contains the main components and trace elements in weight percent. Wherein the main components and the contents thereof are as follows: 9% of Si, 0.8% of Fe, 0.6% of Mg, 0.2% of Er and 0.4% of Y; the trace element components and the contents thereof are as follows: 0.06% B, 0.05% Ti, 0.005% C, 0.05% Sr; the balance being Al.
The smelting process flow of this example is the same as that of example 1, and different process parameters are different.
The specific process comprises the following steps:
(1) melting aluminum alloy: designing alloy components according to performance requirements, taking industrial pure aluminum, Al-20Si, Al-20Fe and Al-10Mg intermediate alloy as raw materials, preparing and melting the aluminum alloy according to target components; controlling the melting temperature at 720 ℃, uniformly stirring for 5min after the alloy is completely melted to obtain an aluminum alloy melt, standing and preserving heat for 20 min;
(2) b, melt B treatment: skimming dross on the surface of the aluminum alloy melt, adding Al-3B intermediate alloy into the alloy melt prepared in the step (1), carrying out B treatment, controlling the treatment temperature at 720 ℃, uniformly stirring for 5min to obtain a B-treated aluminum alloy melt, and standing and preserving heat for 10 min;
(3) alloying treatment of the melt rare earth: skimming dross on the surface of the aluminum alloy melt, adding Al-20Er and Al-20Y intermediate alloy into the aluminum alloy melt melted in the step (2), controlling the treatment temperature at 720 ℃, uniformly stirring for 10min to obtain a multi-element aluminum alloy melt, standing and cooling to 700 ℃;
(4) refining the melt: adding an Al-5Ti-C refiner into the melt treated in the step (3) to carry out melt refining treatment, controlling the treatment temperature at 700 ℃, fully stirring for 5min, standing and preserving heat for 10 min;
(5) modification treatment of the melt: adding Al-10Sr intermediate alloy into the alloy melt obtained in the step (4), controlling the treatment temperature at 700 ℃, uniformly stirring for 2min, standing and cooling to 680 ℃;
(6) melt refining and deslagging: and (4) adding a refining agent and a deslagging agent into the melt processed in the step (5), refining and deslagging, controlling the processing temperature to be 680 ℃, standing for 5min, discharging from the furnace after slagging off, and casting and molding.
After cooling, samples were taken from the ingots for performance and texture analysis. And sampling from the casting, keeping the temperature at 280 ℃ for 2h, carrying out low-temperature annealing treatment, and carrying out performance and structure analysis by following the same method.
The thermal conductivity of the alloy in the as-cast condition was measured to be 150.2W/(mK) and increased to 174.7W/(mK) after annealing. The hardness under the casting state is 98.9HB, which is 68.3% higher than that of the alloy in the comparative example 1, and the hardness after annealing is 102.3HB, which is 3.4% higher than that of the alloy with the same components in the casting state. Compared with the alloy in the comparative example 1, the hardness in the cast state is improved by 52.7 percent, and the hardness in the annealed state is improved by 68.3 percent. The alloy fully exerts the strengthening effect of Mg and rare earth, not only obviously improves the hardness in an as-cast state, but also has excellent annealing softening resistance after the alloy is annealed. The corrosion rate of the alloy is 0.073mg/cm in an as-cast state2D, slightly reduced after annealing, 0.071mg/cm2D, the alloy is reduced by 66.1 percent compared with the alloy of comparative example 1 in the same annealing state, and the corrosion resistance is greatly improved. Compared with the alloy of the comparative example 1, the embodiment obviously solves the problem of insufficient bearing capacity in the application of casting Al-Si alloy, and realizes the synchronous promotion of the mechanical property and the corrosion resistance of the cast aluminum alloy. Namely, the cast aluminum alloy has excellent mechanical property and corrosion resistance after annealing treatment, simultaneously has good heat-conducting property, and can meet the requirement of material performance level under the severe condition of high-temperature stress.
Example 4: al-6Si-0.6Fe-1.2Mg-0.3Er-0.2Y alloy and treatment thereof
The raw materials used were the same as in example 1, except that the raw materials were weighed according to the compounding ratio requirements. The composition of the alloy of this example contains the main components and trace elements in weight percent. Wherein the main components and the contents thereof are as follows: 6% of Si, 0.6% of Fe, 1.2% of Mg, 0.3% of Er and 0.2% of Y; the trace element components and the contents thereof are as follows: 0.03% of B, 0.025% of Ti, 0.0025% of C and 0.02% of Sr; the balance being Al.
The smelting process flow of this example is the same as that of example 1, and different process parameters are different.
The specific process comprises the following steps:
(1) melting aluminum alloy: designing alloy components according to performance requirements, taking industrial pure aluminum, Al-20Si, Al-20Fe and Al-10Mg intermediate alloy as raw materials, preparing and melting the aluminum alloy according to target components; controlling the melting temperature at 730 ℃, uniformly stirring for 5min after the alloy is completely melted to obtain an aluminum alloy melt, and standing and preserving heat for 30 min;
(2) b, melt B treatment: skimming dross on the surface of the aluminum alloy melt, adding Al-3B intermediate alloy into the alloy melt prepared in the step (1), carrying out B treatment, controlling the treatment temperature at 730 ℃, uniformly stirring for 5min to obtain a B-treated aluminum alloy melt, and standing and preserving heat for 10 min;
(3) alloying treatment of the melt rare earth: skimming dross on the surface of the aluminum alloy melt, adding Al-20Er and Al-20Y intermediate alloy into the aluminum alloy melt melted in the step (2), controlling the treatment temperature at 730 ℃, uniformly stirring for 10min to obtain a multi-element aluminum alloy melt, standing and cooling to 700 ℃;
(4) refining the melt: adding an Al-5Ti-C refiner into the melt treated in the step (3) to carry out melt refining treatment, controlling the treatment temperature at 700 ℃, fully stirring for 5min, standing and preserving heat for 10 min;
(5) modification treatment of the melt: adding Al-10Sr intermediate alloy into the alloy melt obtained in the step (4), controlling the treatment temperature at 700 ℃, uniformly stirring for 2min, standing and cooling to 680 ℃;
(6) melt refining and deslagging: and (4) adding a refining agent and a deslagging agent into the melt processed in the step (5), refining and deslagging, controlling the processing temperature to be 680 ℃, standing for 5min, discharging from the furnace after slagging off, and casting and molding.
After cooling, samples were taken from the ingots for performance and texture analysis. And sampling from the casting, keeping the temperature at 280 ℃ for 4h, carrying out low-temperature annealing treatment, and carrying out performance and structure analysis by following the same method.
The alloy in the as-cast state has thermal conductivity of 151.4W/(m.K), hardness of 97.7HB, and corrosion rate of 0.066mg/cm2D, the thermal conductivity of the alloy after annealing is 175.8W/(m.K), the hardness is 99.4HB, and the corrosion rate is0.065mg/cm2D. Compared with the alloy in the comparative example 1, the hardness of the alloy in the cast state is improved by 51 percent, and the hardness of the alloy after annealing is improved by 63 percent. The corrosion rate decreased by 42% in the as-cast state and by 69% after annealing. Compared with the alloy of the comparative example 1, the alloy contains Mg with higher content, influences the heat-conducting property to a certain extent, but simultaneously endows the alloy with strong failure resistance due to high hardness, prolongs the service life of the alloy due to low corrosion rate, and realizes the synchronous promotion of the mechanical property and the corrosion resistance of the cast aluminum alloy. Namely, the cast aluminum alloy has excellent mechanical property and corrosion resistance after annealing treatment, and has good heat-conducting property.
Example 5: al-7Si-Fe-0.9Mg-0.5Er-0.2Y alloy and treatment thereof
The raw materials used were the same as in example 1, except that the raw materials were weighed according to the compounding ratio requirements. The composition of the alloy of this example contains the main components and trace elements in weight percent. Wherein the main components and the contents thereof are as follows: 7% of Si, 1% of Fe, 0.9% of Mg, 0.5% of Er and 0.2% of Y; the trace element components and the contents thereof are as follows: 0.06% B, 0.05% Ti, 0.005% C, 0.05% Sr; the balance being Al.
The smelting process flow of this example is the same as that of example 1, and different process parameters are different.
The specific process comprises the following steps:
(1) melting aluminum alloy: designing alloy components according to performance requirements, taking industrial pure aluminum, Al-20Si, Al-20Fe and Al-10Mg intermediate alloy as raw materials, preparing and melting the aluminum alloy according to target components; controlling the melting temperature at 720 ℃, uniformly stirring for 5min after the alloy is completely melted to obtain an aluminum alloy melt, and standing and preserving heat for 30 min;
(2) b, melt B treatment: skimming dross on the surface of the aluminum alloy melt, adding Al-3B intermediate alloy into the alloy melt prepared in the step (1), carrying out B treatment, controlling the treatment temperature at 720 ℃, uniformly stirring for 5min to obtain a B-treated aluminum alloy melt, and standing and preserving heat for 10 min;
(3) alloying treatment of the melt rare earth: skimming dross on the surface of the aluminum alloy melt, adding Al-20Er and Al-20Y intermediate alloy into the aluminum alloy melt melted in the step (2), controlling the treatment temperature at 720 ℃, uniformly stirring for 10min to obtain a multi-element aluminum alloy melt, standing and cooling to 700 ℃;
(4) refining the melt: adding an Al-5Ti-C refiner into the melt treated in the step (3) to carry out melt refining treatment, controlling the treatment temperature at 700 ℃, fully stirring for 5min, standing and preserving heat for 10 min;
(5) modification treatment of the melt: adding Al-10Sr intermediate alloy into the alloy melt obtained in the step (4), controlling the treatment temperature at 700 ℃, uniformly stirring for 2min, standing and cooling to 680 ℃;
(6) melt refining and deslagging: and (4) adding a refining agent and a deslagging agent into the melt processed in the step (5), refining and deslagging, controlling the processing temperature to be 680 ℃, standing for 5min, discharging from the furnace after slagging off, and casting and molding.
After cooling, samples were taken from the ingots for performance and texture analysis. And sampling from the casting, keeping the temperature at 260 ℃ for 4h, carrying out low-temperature annealing treatment, and carrying out performance and structure analysis by following the same method.
The alloy in the as-cast state has the thermal conductivity of 153.3W/(m.K), the hardness of 75.6HB and the corrosion rate of 0.021mg/cm2D, the thermal conductivity of the alloy after annealing is 179.9W/(m.K), the hardness is 79.8HB, and the corrosion rate is 0.01mg/cm2D. Compared with the alloy in the comparative example 1, the hardness of the alloy in the as-cast state is improved by 16.8 percent, and the hardness of the alloy after annealing is improved by 31.2 percent. The corrosion rate decreased by 81.7% in the as-cast state and by 95.3% after annealing. In this example, Mg was contained in a higher amount than in the alloy of comparative example 1, and the heat conductivity was affected to some extent, but Mg refined the aluminum alloy grains, and reduced the destructive effect of coarse eutectic silicon on the corrosion resistance, and Mg2The Si phase can be dissolved preferentially in the corrosion reaction while improving the hardness, thereby protecting the matrix. Rare earth Er and Y can be combined with Fe, so that the iron-rich phase is changed into a short rod from a thick needle shape and a sheet shape, and the cutting of a matrix is reduced. The cast aluminum alloy has excellent corrosion resistance, good heat conductivity and annealing softening resistance, and can be used as a material applied in a severe corrosion environment.
Example 6: al-9Si-0.6Fe-0.6Mg-0.5Er-0.2Y alloy and treatment thereof
The raw materials used were the same as in example 1, except that the raw materials were weighed according to the compounding ratio requirements. The composition of the alloy of this example contains the main components and trace elements in weight percent. Wherein the main components and the contents thereof are as follows: 9% of Si, 0.6% of Fe, 0.6% of Mg, 0.5% of Er and 0.2% of Y; the trace element components and the contents thereof are as follows: 0.06% B, 0.025% Ti, 0.005% C, 0.05% Sr; the balance being Al.
The smelting process flow of this example is the same as that of example 1, and different process parameters are different.
The specific process comprises the following steps:
(1) melting aluminum alloy: designing alloy components according to performance requirements, taking industrial pure aluminum, Al-20Si, Al-20Fe and Al-10Mg intermediate alloy as raw materials, preparing and melting the aluminum alloy according to target components; controlling the melting temperature at 720 ℃, uniformly stirring for 5min after the alloy is completely melted to obtain an aluminum alloy melt, standing and preserving heat for 20 min;
(2) b, melt B treatment: skimming dross on the surface of the aluminum alloy melt, adding Al-3B intermediate alloy into the alloy melt prepared in the step (1), carrying out B treatment, controlling the treatment temperature at 730 ℃, uniformly stirring for 5min to obtain a B-treated aluminum alloy melt, and standing and preserving heat for 10 min;
(3) alloying treatment of the melt rare earth: skimming dross on the surface of the aluminum alloy melt, adding Al-20Er and Al-20Y intermediate alloy into the aluminum alloy melt melted in the step (2), controlling the treatment temperature at 730 ℃, uniformly stirring for 10min to obtain a multi-element aluminum alloy melt, standing and cooling to 700 ℃;
(4) refining the melt: adding an Al-5Ti-C refiner into the melt treated in the step (3) to carry out melt refining treatment, controlling the treatment temperature at 700 ℃, fully stirring for 5min, standing and preserving heat for 10 min;
(5) modification treatment of the melt: adding Al-10Sr intermediate alloy into the alloy melt obtained in the step (4), controlling the treatment temperature at 700 ℃, uniformly stirring for 2min, standing and cooling to 680 ℃;
(6) melt refining and deslagging: and (4) adding a refining agent and a deslagging agent into the melt processed in the step (5), refining and deslagging, controlling the processing temperature to be 680 ℃, standing for 5min, discharging from the furnace after slagging off, and casting and molding.
After cooling, samples were taken from the ingots for performance and texture analysis. And sampling from the casting, keeping the temperature at 250 ℃ for 4h, carrying out low-temperature annealing treatment, and carrying out performance and structure analysis by following the same method.
The alloy in the as-cast state has thermal conductivity of 149.8W/(m.K), hardness of 86.9HB, and corrosion rate of 0.052mg/cm2D, the thermal conductivity of the alloy after annealing is 175.2W/(m.K), the hardness is 92.7HB, and the corrosion rate is 0.039mg/cm2D. Compared with the alloy in the comparative example 1, the hardness of the alloy in the cast state is improved by 34.3 percent, and the hardness of the alloy after annealing is improved by 52.4 percent. The corrosion rate decreased by 54.4% in the as-cast state and by 81.6% after annealing. Compared with the alloy of the comparative example 1, the hardness of the alloy is improved after annealing, the corrosion rate is reduced, the thermal conductivity reaches more than 170W/(m.K), and the alloy can meet the comprehensive performance requirement of a 5G era high-temperature environment as a heat dissipation device.
To more conveniently compare the beneficial effects of the present invention, the thermal conductivity, corrosion rate and hardness of the alloys of the comparative examples and examples are summarized in table 1. The alloy of the present invention has comparable thermal conductivity to the alloy of comparative example 1. But the difference is that the hardness is slightly improved after annealing, the corrosion rate is reduced, and the stable annealing softening resistance and the excellent corrosion resistance are shown.
TABLE 1 Properties of the alloys of the comparative examples and examples
The practical engineering application problem of improving heat conduction through annealing but causing annealing softening in the practical production of the invention is based on a multiple influence mechanism of annealing on the structure and performance of an as-cast material, so as to solve the scientific problem that the heat conduction performance and the mechanical performance are difficult to be comprehensively balanced, give full play to the multi-component composite modification effect, improve the form and distribution of a second phase in the alloy, reduce melt impurities, reduce the potential difference between a matrix and a second phase electrode, finally realize the improvement of the heat conduction performance and the annealing softening resistance of the alloy, more obviously improve the corrosion resistance of the alloy, realize the good matching of the excellent heat conduction performance, the annealing softening resistance and the corrosion resistance, meet the multi-component requirement of the manufacturing of a heating device in the 5G era, and expand the application space of casting Al-Si alloy.
The embodiments of the present invention are not limited to the embodiments described above, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and they are included in the scope of the present invention.
Claims (10)
1. The utility model provides a high heat conduction corrosion-resistant cast aluminum alloy of anti annealing softening which characterized in that: the composition of the alloy comprises Al, a main component and a trace element component; the contents of the components are as follows by weight percent:
the main components and the contents thereof are as follows:
6～9％Si，0.6～1.0％Fe，0.5～1.2％Mg，0.2～0.5％Er，0.2～0.5％Y；
the trace element components and the contents thereof are as follows:
0.03～0.06％B，0.025～0.05％Ti，0.0025～0.005％C，0.02～0.05％Sr；
the balance being Al.
2. The method of making an annealing-softening resistant, high thermal conductivity, corrosion resistant cast aluminum alloy of claim 1, wherein: the method comprises the following steps:
1) melting aluminum alloy: melting aluminum and aluminum alloy containing more than one of Si, Fe and Mg elements, standing and preserving heat to obtain aluminum alloy melt; the aluminum alloy melt contains Si, Fe and Mg elements;
2) and (3) boronizing the melt: adding the aluminum alloy containing B into the aluminum alloy melt, carrying out boronization treatment, standing and preserving heat to obtain a boronized aluminum alloy melt;
3) alloying treatment of the melt rare earth: adding more than one aluminum alloy containing Er and Y into the boronized aluminum alloy melt, alloying, standing and cooling to obtain a multi-element aluminum alloy melt; the multi-element aluminum alloy melt contains Er and Y elements;
4) adding an aluminum titanium carbon refiner into the multi-element aluminum alloy melt, refining the melt, standing and preserving heat to obtain a refined melt;
5) modification treatment of the melt: adding Sr-containing aluminum alloy into the refined melt, modifying, standing and cooling to obtain modified melt;
6) melt refining and deslagging: adding refining agent and deslagging agent into the melt after modification treatment, carrying out refining deslagging treatment, and casting and forming.
3. The method of making an annealing-softening resistant, high thermal conductivity, corrosion resistant cast aluminum alloy of claim 2, wherein: the temperature of the boronizing treatment in the step 2) is 720-750 ℃, and the time of the boronizing treatment in the step 2) is 2-5 min;
the temperature of the alloying treatment in the step 3) is 720-750 ℃, and the time of the alloying treatment is 5-10 min;
the temperature of the melt refining treatment in the step 4) is 700-720 ℃, and the time of the melt refining treatment is 2-5 min:
the temperature of modification treatment in the step 5) is 700-720 ℃, and the time of modification treatment is 2-5 min;
and 6) annealing the cast casting formed in the step 6), wherein the annealing temperature is 220-280 ℃, and the annealing time is 2-6 h.
4. The method of making an annealing-softening resistant, high thermal conductivity, corrosion resistant cast aluminum alloy of claim 2, wherein: the standing and cooling in the step 3) means standing and cooling to 700-720 ℃;
the step 5) of standing and cooling refers to standing and cooling to 680-700 ℃;
the melting temperature in the step 1) is 720-750 ℃.
5. The method of making an annealing-softening resistant, high thermal conductivity, corrosion resistant cast aluminum alloy of claim 2, wherein: standing and insulating for 5-30 min in the step 1);
standing and preserving heat for 5-30 min in the step 2);
and (4) standing and heat preservation for 5-30 min.
6. The method of making an annealing-softening resistant, high thermal conductivity, corrosion resistant cast aluminum alloy of claim 2, wherein: the aluminum alloy containing more than one of Si, Fe and Mg in the step 1) is an Si-containing aluminum alloy, an Fe-containing aluminum alloy or an Mg-containing aluminum alloy;
the B-containing aluminum alloy in the step 2) is Al-3B intermediate alloy;
the aluminum alloy containing more than one of Er and Y in the step 3) is Al-20Er intermediate alloy and Al-20Y intermediate alloy;
the aluminum-titanium-carbon refiner in the step 4) is an Al-5Ti-C refiner;
the Sr-containing aluminum alloy in the step 5) is Al-10Sr intermediate alloy.
7. The method of making an annealing-softening resistant, high thermal conductivity, corrosion resistant cast aluminum alloy of claim 6, wherein: the Si-containing aluminum alloy, the Fe-containing aluminum alloy and the Mg-containing aluminum alloy are intermediate alloys of Al-20Si, Al-20Fe and Al-10Mg respectively.
8. The method of making an annealing-softening resistant, high thermal conductivity, corrosion resistant cast aluminum alloy of claim 2, wherein: after the aluminum alloy is completely melted in the step 1), uniformly stirring, and then standing and preserving heat; stirring for 5-10 min;
the boronizing treatment in the step 2) is stirring at 720-750 ℃ for 2-5 min;
the alloying treatment in the step 3) is stirring for 5-10 min at 720-750 ℃;
the melt refining treatment in the step 4) is stirring for 2-5 min at 700-720 ℃;
the modification treatment in the step 5) is stirring for 2-5 min at 700-720 ℃;
the temperature of the refining deslagging treatment in the step 6) is 680-700 ℃.
9. The method of making an annealing-softening resistant, high thermal conductivity, corrosion resistant cast aluminum alloy of claim 2, wherein: adding a refining agent and a deslagging agent in the step 6), and standing for 4-6 min;
and the refining deslagging is realized by adding YT-J-1 type refining agent and YT-D-4 type deslagging agent by a nitrogen blowing method.
10. Use of an annealing-softening resistant, high thermal conductivity, corrosion resistant cast aluminum alloy according to claim 1, wherein: the annealing softening resistant high-heat-conductivity corrosion-resistant cast aluminum alloy is used in the field of heat dissipation.
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