CN111218591A - Preparation method of high-strength and high-toughness 7XXX aluminum alloy section for new energy automobile power system - Google Patents
Preparation method of high-strength and high-toughness 7XXX aluminum alloy section for new energy automobile power system Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C21/00—Alloys based on aluminium
- C22C21/10—Alloys based on aluminium with zinc as the next major constituent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/002—Extruding materials of special alloys so far as the composition of the alloy requires or permits special extruding methods of sequences
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C31/00—Control devices, e.g. for regulating the pressing speed or temperature of metal; Measuring devices, e.g. for temperature of metal, combined with or specially adapted for use in connection with extrusion presses
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- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/002—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working by rapid cooling or quenching; cooling agents used therefor
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
- C22F1/053—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with zinc as the next major constituent
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Abstract
The invention discloses a preparation method of a high-strength and high-toughness 7XXX aluminum alloy section for a new energy automobile power system, which comprises the following steps: alloy smelting and casting, secondary homogenization treatment and extrusion, online quenching of an extruder, stretching and time-effect heat treatment, and process parameters matched with the process steps. The invention realizes the 7XXX aluminum alloy which is suitable for a new energy automobile power system and has excellent comprehensive performance by adjusting the homogenization treatment process, the hot extrusion process and the heat treatment process of the alloy ingot, and the aluminum alloy produced by the method has the tensile strength of over 400MPa, the elongation of over 13 percent and the intergranular corrosion resistance grade of 1 grade.
Description
Technical Field
The invention relates to the technical field of aluminum alloy materials, and particularly relates to a preparation method of a high-strength and high-toughness 7XXX aluminum alloy section for a new energy automobile power system.
Background
With the increase of the understanding depth of the energy-saving and environment-friendly concept, the light weight of the automobile industry is more important, especially the new energy automobile industry. According to measurement and calculation, the weight of the automobile is reduced by 10%, and the endurance mileage of the new energy automobile can be improved by 5.5%. Therefore, the method is suitable for new energy automobiles, and the development of the high-strength and high-toughness aluminum alloy material is the most effective way for reducing the weight of the automobile.
The aluminum alloy used in the power system of the new energy automobile is basically the traditional 6061 and 6082, and the tensile strength of the two alloys is between 280 and 310 MPa. If the strength of the 7-series aluminum alloy exceeds 400MPa, a weight reduction effect of 17% can be achieved without a significant increase in the cost thereof.
In conclusion, it is very significant to develop a preparation method of an aluminum alloy profile which is suitable for the new energy automobile industry, low in cost and excellent in comprehensive performance.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the preparation method of the high-strength and high-toughness 7XXX aluminum alloy section for the new energy automobile power system, the preparation of the high-strength and high-toughness 7 series aluminum alloy section can be realized through the method, the cost is low, the comprehensive performance is excellent, and the method is very suitable for being used for new energy automobile power battery system components.
The invention is realized by the following technical scheme.
A high-strength and high-toughness 7XXX aluminum alloy section for a new energy automobile power system is composed of the following raw materials in percentage by mass: zn3.0-5.5%, Mg0.5-0.95%, Si0.5-0.6%, Fe0.01-0.6%, Cu0.2-0.3%, Mn0.05-0.3%, Cr0.01-0.1%, Ti0.15-0.25%, Zr0.25-0.3%, and the balance of Al.
Furthermore, the sum of the contents of Zn, Mg and Zr is between 4.2 and 6.5 percent.
A preparation method of a high-toughness 7XXX aluminum alloy section for a new energy automobile power system is characterized by comprising the following steps:
1) alloy smelting: setting the furnace temperature at 750-840 ℃, adding a remelting aluminum ingot, a Zn ingot and Mn, Fe, Si, Cu, Cr, Ti and Zr into the smelting furnace in sequence according to the proportion, adding an Mg ingot when the furnace burden is completely molten and the melt temperature reaches 700-750 ℃, and sampling, analyzing and adjusting components after stirring; after the components are qualified, heating the furnace burden to 750-800 ℃, adding a refining agent, and introducing protective atmosphere to perform degassing and deslagging for 15-38 min; standing and pouring the obtained alloy liquid into an ingot, wherein the casting speed is 65-80 mm/min;
2) homogenizing: placing the ingot obtained in the step 1) in a homogenizing heat treatment furnace for primary homogenizing treatment, wherein the temperature of the primary homogenizing treatment is 540-550 ℃, and the heat preservation time is 2-4 h; then, carrying out primary extrusion on the cast ingot, wherein the aluminum alloy cast ingot is preheated, the preheating temperature is 440-460 ℃, the tool and the die are preheated, the preheating temperature is 460-470 ℃, the extrusion cylinder is preheated, the preheating temperature is 420-430 ℃, the extrusion ratio is controlled to be 2-5, and the extrusion speed is controlled to be 7-8 m/min; then, carrying out secondary homogenization treatment on the obtained extruded section, wherein the treatment temperature is 525-540 ℃, and the heat preservation time is 1-3 h;
3) extruding and online quenching: preheating the section obtained in the step 2), wherein the preheating temperature is 460-470 ℃, preheating a tool and a die, the preheating temperature is 450-460 ℃, preheating an extruder, the preheating temperature is 420-430 ℃, controlling the extrusion ratio and the section outlet speed, ensuring the extrusion outlet temperature to be 470-480 ℃, then directly carrying out water-cooling on-line quenching on the extruded section, and the temperature after quenching is less than 100 ℃;
4) stretching and heat treatment: firstly, stretching the aluminum alloy extruded section obtained in the step 3) to a stretching ratio of 0.2-0.5%, and then carrying out secondary artificial aging; wherein the primary aging temperature is 180-200 ℃, the heat preservation time is 30-120 min, the secondary aging temperature is 115-125 ℃, and the heat preservation time is 2-4 h.
Further, the mass of the refining agent in the step 1) accounts for 0.2-0.3% of the mass of the melt (namely the sum of all aluminum alloy furnace charges and the refining agent) in the smelting furnace.
Further, the extrusion ratio in the step 3) is 20-45.
Further, the outlet speed of the section bar in the step 3) is 5-7 m/min.
Further, the refining agent in the step 1) is sodium nitrate.
Furthermore, the high-strength and high-toughness 7XXX aluminum alloy for the new energy automobile power system obtained by the method has the tensile strength of over 400Mpa, the elongation of over 13 percent and the intergranular corrosion resistance grade of 1 grade.
By controlling the process steps and process parameters in the preparation of the alloy section, the invention finally realizes the aluminum alloy section which has low cost, excellent comprehensive performance, high toughness and is suitable for a new energy automobile power system.
The homogenization treatment adopts a mode of two-stage homogenization and one-time extrusion to treat the ingot, the most important purpose is to ensure the uniform distribution of the alloy elements in the ingot, and on one hand, the temperature of the first-stage homogenization treatment is higher, so that the uniform distribution of the alloy elements can be effectively promoted; on the other hand, after the primary extrusion, the alloy is in a severe plastic deformation state, and the grain refinement is obvious, so that the secondary homogenization at a lower temperature for a shorter time can ensure the complete and uniform distribution of elements in the ingot, and simultaneously reduce the homogenization treatment time, and although the one-step extrusion process is added, the extrusion ratio is low, and the cost of the material is slightly increased.
The online quenching process is an important means for realizing the excellent performance and the cost control of the alloy, and the online quenching process adopts water cooling, and has the main purposes of: firstly, the water-cooling quenching speed is high, so that the alloy elements can form supersaturated solid solution in the aluminum alloy matrix; secondly, although the residual stress of the quenched section is larger, the invention adds a stretching treatment process, and can effectively reduce the adverse effect caused by the residual stress.
The aging process is an important step for realizing the excellent performance of the alloy, the corrosion resistance of the 7xxx aluminum alloy is poorer, the alloy performance is improved by adjusting the precipitation sequence and the precipitation phase form of the alloy in a general method, and the alloy has excellent comprehensive performances of high toughness, corrosion resistance and the like through a primary aging process at a higher temperature and a secondary aging process at a lower temperature.
The invention has the beneficial effects that:
the invention realizes the 7XXX aluminum alloy which is suitable for a new energy automobile power system and has excellent comprehensive performance by adjusting the homogenization treatment process, the hot extrusion process and the heat treatment process of the alloy ingot, and the aluminum alloy produced by the method has the tensile strength of over 400MPa, the elongation of over 13 percent and the intergranular corrosion resistance grade of 1 grade.
The preparation method adopts a novel homogenization heat treatment system, obviously reduces the homogenization treatment time and effectively improves the homogenization effect of the alloy.
The invention obviously reduces the residual stress of the alloy by adding the stretching and secondary aging processes, and ensures the excellent comprehensive excellent performances of high toughness, corrosion resistance and the like of the alloy.
The aluminum alloy prepared by the invention has simple process and low cost, and is suitable for batch production.
Drawings
FIG. 1 is a drawing property curve diagram of a high-strength and high-toughness extrusion-molded aluminum alloy material product for a new energy automobile power system.
Detailed Description
The invention will be described in further detail below with reference to the drawings and examples.
FIG. 1 is a tensile property curve of a high-strength and high-toughness extrusion-molded aluminum alloy material product for a new energy automobile power system, which is prepared in one embodiment, and it can be seen from FIG. 1 that the tensile strength of an aluminum alloy section prepared by the method exceeds 400MPa, and the aluminum alloy section can meet the requirements of most industries; further, the elongation exceeds 13%, and the steel sheet has excellent ductility and is suitable for extrusion molding.
Example 1
In the embodiment, the high-strength and high-toughness 7XXX aluminum alloy for the new energy automobile power system and the preparation method thereof comprise the following raw materials in parts by weight: zn 3%, Mg0.95%, Si0.5%, Fe0.4%, Cu0.2%, Mn0.3%, Cr0.05%, Ti0.25%, Zr0.25%, and the balance of Al.
1) Alloy smelting: setting the furnace gas temperature at 800 ℃, sequentially adding prepared remelting aluminum ingot, Zn ingot, Mn, Fe, Si, Cu, Cr, Ti and Zr according to the block weight and size, adding Mg ingot when furnace burden is completely melted and the melt temperature reaches 700 ℃, and sampling, analyzing and adjusting components after stirring; after the components are qualified, heating the furnace burden to 760 ℃, adding 0.2 percent of refining agent (sodium nitrate), and introducing protective atmosphere (nitrogen) to perform degassing and deslagging for 38 min; and after standing, casting the obtained alloy liquid into ingots at the casting speed of 70 mm/min.
2) Homogenizing: placing the ingot obtained in the step 1) in a homogenizing heat treatment furnace for primary homogenizing treatment, wherein the specific treatment scheme is as follows: firstly, the temperature of primary homogenization treatment is 545 ℃, and the heat preservation time is 3 hours; the ingot was then subjected to a primary extrusion: firstly, preheating an aluminum alloy ingot, a tool and a die and an extrusion container, wherein the preheating temperature is 450 ℃, 465 ℃ and 425 ℃, the extrusion ratio is 5, and the extrusion speed is 7 m/min; then, the extruded section is subjected to secondary homogenization treatment, the heat treatment temperature is 525 ℃, and the heat preservation time is 2 hours.
3) Extruding and online quenching: extruding the aluminum alloy section obtained in the step 2), and controlling the technological parameters as follows: preheating the aluminum alloy section, the tool and the die and the extruder obtained in the step 2), wherein the preheating temperature is 465 ℃, 455 ℃ and 430 ℃, the extrusion ratio is 20, the extrusion speed is 6m/min, and the extrusion outlet temperature is guaranteed to be 475 ℃. Then the extruded section is directly subjected to water cooling on-line quenching, and the temperature after quenching is 80 ℃.
4) Stretching and heat treatment: stretching the extruded material of the alloy obtained in the step 3) at a stretching rate of 0.2%, and then carrying out secondary artificial aging. The primary aging system is 190 ℃, the heat preservation time is 1h, the secondary aging system is 120 ℃, and the heat preservation time is 4 h.
Example 2
In the embodiment, the high-strength and high-toughness 7XXX aluminum alloy for the new energy automobile power system and the preparation method thereof comprise the following raw materials in parts by weight: zn 4%, Mg0.8%, Si0.6%, Fe0.01%, Cu0.2%, Mn0.05%, Cr0.1%, Ti0.15%, Zr0.3%, and the balance of Al.
1) Alloy smelting: setting the temperature of furnace gas at 840 ℃, adding prepared remelting aluminum ingot, Zn ingot and Mn, Fe, Si, Cu, Cr, Ti and Zr intermediate alloy in sequence according to the block weight and size, adding Mg ingot when furnace burden is completely melted and the melt temperature reaches 750 ℃, and sampling, analyzing and adjusting components after stirring; after the components are qualified, heating the furnace burden to 750 ℃, adding 0.3 percent of refining agent (sodium nitrate), and introducing protective atmosphere (nitrogen) to perform degassing and deslagging for 15 min; and after standing, casting the obtained alloy liquid into ingots at the casting speed of 65 mm/min.
2) Homogenizing: placing the ingot obtained in the step 1) in a homogenizing heat treatment furnace for homogenizing treatment, wherein the specific treatment scheme is as follows: firstly, homogenizing at 540 ℃ for 4 h; then, carrying out primary extrusion on the cast ingot, firstly preheating the aluminum alloy cast ingot, the tool and the die and the extrusion cylinder, wherein the preheating temperature is 460 ℃, 470 ℃ and 430 ℃, the extrusion ratio is 2, and the extrusion speed is 8 m/min; then, the extruded section is subjected to secondary homogenization treatment, the heat treatment temperature is 530 ℃, and the heat preservation time is 1 h.
3) Extruding and online quenching: extruding the aluminum alloy section obtained in the step 2), and controlling the technological parameters as follows: preheating the aluminum alloy section, the tool and the die and the extruder in the step 2), wherein the preheating temperature is 460 ℃, 460 ℃ and 420 ℃, the extrusion ratio is 45, the extrusion speed is 7m/min, and the temperature of an extrusion outlet is ensured to be 470 ℃. Then the extruded section is directly subjected to water cooling on-line quenching, and the temperature after quenching is 80 ℃.
4) Stretching and heat treatment: stretching the extruded material of the alloy obtained in the step 3) at a stretching rate of 0.4%, and then carrying out secondary artificial aging. The primary aging system is 200 ℃, the heat preservation time is 30min, the secondary aging system is 115 ℃, and the heat preservation time is 3 h.
Example 3
In the embodiment, the high-strength and high-toughness 7XXX aluminum alloy for the new energy automobile power system and the preparation method thereof comprise the following raw materials in parts by weight: zn 5%, Mg0.5%, Si0.55%, Fe0.2%, Cu0.2%, Mn0.3%, Cr0.1%, Ti0.15%, Zr0.25%, and the balance of Al.
1) Alloy smelting: setting the furnace gas temperature of a smelting furnace to 750 ℃, sequentially adding prepared remelted aluminum ingots, Zn ingots and intermediate alloys of Mn, Fe, Si, Cu, Cr, Ti and Zr according to the block weight and the size, adding Mg ingots when furnace burden is completely melted and the melt temperature reaches 725 ℃, and sampling, analyzing and adjusting components after stirring; after the components are qualified, heating the furnace burden to 800 ℃, adding 0.25% of refining agent (sodium nitrate), and introducing protective atmosphere (nitrogen) to perform degassing and deslagging for 25 min; and after standing, casting the obtained alloy liquid into ingots at the casting speed of 80 mm/min.
2) Homogenizing: placing the ingot obtained in the step 1) in a homogenizing heat treatment furnace for homogenizing treatment, wherein the specific treatment scheme is as follows: firstly, homogenizing at 550 ℃ for 2 h; then, carrying out primary extrusion on the cast ingot, preheating the aluminum alloy cast ingot, the tool and the die and the extrusion cylinder, wherein the preheating temperature is 440 ℃, 460 ℃ and 430 ℃, the extrusion ratio is 4, and the extrusion speed is 7 m/min; then, the extruded section is subjected to secondary homogenization treatment, the heat treatment temperature is 540 ℃, and the heat preservation time is 3 hours.
3) Extruding and online quenching: extruding the aluminum alloy section obtained in the step 2), and controlling the technological parameters as follows: preheating the aluminum alloy section obtained in the step 2), a tool and a die and an extruder, wherein the preheating temperature is 470 ℃, 450 ℃ and 425 ℃, the extrusion ratio is 30, the extrusion speed is 5m/min, and the extrusion outlet temperature is guaranteed to be 480 ℃. And then directly carrying out water-cooling on-line quenching on the section bar obtained by extrusion, wherein the temperature after quenching is 80 ℃.
4) Stretching and heat treatment: the extruded material of the alloy obtained in the step 3) is firstly stretched, the stretching ratio is 0.5%, and then secondary artificial aging is carried out. The primary aging system is 180 ℃, the heat preservation time is 2h, the secondary aging system is 125 ℃, and the heat preservation time is 2 h.
Comparative example 1
The difference from example 1 is: the homogenization heat treatment is a two-stage homogenization process but primary extrusion is not performed.
Comparative example 2
The difference from example 1 is: the temperature of the first-stage aging process is lower, the temperature of the second-stage aging process is higher, and the specific process comprises the following steps: the primary aging system is 120 ℃, the heat preservation time is 1h, the secondary aging system is 190 ℃, and the heat preservation time is 4 h.
Comparative example 3
The difference from example 1 is: the aging regime is still secondary aging but not tensile.
The results of comparing the overall properties of the alloys of examples 1-3 and comparative examples 1-3 are shown in the table. Examples 1-3 are in accordance with the embodiments of the present invention, and it can be seen that the mechanical properties and intergranular corrosion properties of the alloy are excellent, the overall performance is good, and the rationality of the present scheme is also reflected. The comparison result between the comparative example 1 and the example 1 shows that the alloy of the invention is unreasonably subjected to a two-stage homogenization process without one-time extrusion, the mechanical property is reduced, and the intergranular corrosion resistance is reduced, so that the performance of the alloy can be fully exerted only through two-stage homogenization treatment and one-time extrusion. The comparison result between the comparative example 2 and the example 1 shows that the alloy performance of the first-stage aging process at a lower temperature and the second-stage aging process at a higher temperature is slightly reduced, and the intercrystalline corrosion resistance is also reduced, so that the reasonable double-stage aging process can obviously improve the intercrystalline corrosion resistance of the alloy. The comparison result between the comparative example 3 and the example 1 shows that although the comprehensive properties of the alloy which is not stretched are not changed greatly, the residual stress of the alloy product after water-cooling quenching is overlarge in the subsequent processing process, so that the product is deformed and then scrapped.
TABLE 1 Overall Properties of examples 1-3 and comparative examples 1-3
| Examples | Tensile strength MPa | Yield strength MPa | Elongation percentage% | Grade of intergranular corrosion |
| 1 | 404 | 362 | 14 | 1 |
| 2 | 402 | 368 | 13 | 1 |
| 3 | 408 | 372 | 13 | 1 |
| Comparative example | Tensile strength MPa | Yield strength MPa | Elongation percentage% | Grade of intergranular corrosion |
| 1 | 370 | 331 | 9.9 | 2-3 |
| 2 | 398 | 352 | 12 | 2-3 |
| 3 | 400 | 359 | 13 | 1 |
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention. It should be noted that other equivalent modifications can be made by those skilled in the art in light of the teachings of the present invention, and all such modifications can be made as are within the scope of the present invention.
Claims (7)
1. A preparation method of a high-strength and high-toughness 7XXX aluminum alloy section for a new energy automobile power system comprises the following raw materials in percentage by mass: zn3.0% -5.5%, Mg0.5% -0.95%, Si0.5% -0.6%, Fe0.01% -0.6%, Cu0.2% -0.3%, Mn0.05% -0.3%, Cr0.01% -0.1%, Ti0.15% -0.25%, Zr0.25% -0.3%, and the balance of Al;
characterized in that the method comprises the steps of:
1) alloy smelting: setting the furnace temperature at 750-840 ℃, adding remelting aluminum ingot, Zn ingot and Mn, Fe, Si, Cu, Cr, Ti and Zr according to the proportion in sequence, adding Mg ingot when the furnace burden is completely molten and the melt temperature reaches 700-750 ℃, and sampling, analyzing and adjusting components after stirring; after the components are qualified, heating the furnace burden to 750-800 ℃, adding a refining agent, and introducing protective atmosphere to perform degassing and deslagging for 15-38 min; standing and pouring the obtained alloy liquid into an ingot, wherein the casting speed is 65-80 mm/min;
2) homogenizing: placing the ingot obtained in the step 1) in a homogenizing heat treatment furnace for primary homogenizing treatment, wherein the temperature of the primary homogenizing treatment is 540-550 ℃, and the heat preservation time is 2-4 h; then, carrying out primary extrusion on the cast ingot, wherein the aluminum alloy cast ingot is preheated, the preheating temperature is 440-460 ℃, the tool and the die are preheated, the preheating temperature is 460-470 ℃, the extrusion cylinder is preheated, the preheating temperature is 420-430 ℃, the extrusion ratio is controlled to be 2-5, and the extrusion speed is controlled to be 7-8 m/min; then, carrying out secondary homogenization treatment on the obtained extruded section, wherein the treatment temperature is 525-540 ℃, and the heat preservation time is 1-3 h;
3) extruding and online quenching: preheating the section obtained in the step 2), wherein the preheating temperature is 460-470 ℃, preheating a tool and a die, the preheating temperature is 450-460 ℃, preheating an extruder, the preheating temperature is 420-430 ℃, controlling the extrusion ratio and the section outlet speed, ensuring the extrusion outlet temperature to be 470-480 ℃, then directly carrying out water-cooling on-line quenching on the extruded section, and the temperature after quenching is less than 100 ℃;
4) stretching and heat treatment: firstly, stretching the aluminum alloy extruded section obtained in the step 3) to a stretching ratio of 0.2-0.5%, and then carrying out secondary artificial aging; wherein the primary aging temperature is 180-200 ℃, the heat preservation time is 30-120 min, the secondary aging temperature is 115-125 ℃, and the heat preservation time is 2-4 h.
2. The method as claimed in claim 1, wherein the mass of the refining agent in the step 1) accounts for 0.2-0.3% of the mass of the melt in the smelting furnace.
3. The method of claim 1, wherein the extrusion ratio in step 3) is 20 to 45.
4. The method as claimed in claim 1, wherein the profile outlet speed in the step 3) is 5-7 m/min.
5. The method as claimed in claim 1, wherein the refining agent in step 1) is sodium nitrate.
6. The method according to claim 1, characterized in that the sum of the contents of Zn, Mg and Zr is between 4.2% and 6.5%.
7. The method as claimed in any one of claims 1 to 6, wherein the obtained high-toughness 7XXX aluminum alloy for the new energy automobile power system has the tensile strength of over 400MPa, the elongation of over 13 percent and the intergranular corrosion resistance grade of 1.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111575616A (en) * | 2020-06-03 | 2020-08-25 | 苏州华尔铝业有限公司 | Preparation method of aluminum alloy section |
| CN113814657A (en) * | 2021-09-03 | 2021-12-21 | 福建祥鑫股份有限公司 | Aluminum-based composite material hot extrusion molding and heat treatment process thereof |
| WO2023165032A1 (en) * | 2022-03-02 | 2023-09-07 | 山东裕航特种合金装备有限公司 | Online quenching-based easily-extruded ultra-high-strength aluminum alloy, and manufacturing method therefor and application thereof |
| CN118028635A (en) * | 2024-02-01 | 2024-05-14 | 宁波环球铝业科技有限公司 | Production method of special 7006A aluminum alloy material |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3642542A (en) * | 1970-02-25 | 1972-02-15 | Olin Corp | A process for preparing aluminum base alloys |
| JPH08225874A (en) * | 1995-02-14 | 1996-09-03 | Furukawa Electric Co Ltd:The | Aluminum alloy extruded material for automobile structural member and its production |
| JPH09249951A (en) * | 1996-03-12 | 1997-09-22 | Nippon Light Metal Co Ltd | Production of aluminum forged product having fine structure |
| JP2010159489A (en) * | 2008-12-09 | 2010-07-22 | Sumitomo Light Metal Ind Ltd | Method for molding 7,000 series aluminum alloy material, and formed product molded by the same |
| CN103993205A (en) * | 2014-04-16 | 2014-08-20 | 池州市光明塑钢有限公司 | High-elongation aluminum alloy section bar and making method thereof |
| CN105441749A (en) * | 2014-09-30 | 2016-03-30 | 黄晓艺 | Seven-series aluminum alloy material and preparation treatment process thereof |
| CN105821353A (en) * | 2016-06-14 | 2016-08-03 | 湖南大学 | Ageing heat-treatment process for improving Al-Zn-Mg strength |
| CN106319308A (en) * | 2016-11-23 | 2017-01-11 | 马鞍山市新马精密铝业股份有限公司 | Manufacturing method of 7000-series aluminum alloy section for vehicular bodies |
| CN108179333A (en) * | 2017-12-29 | 2018-06-19 | 福建祥鑫股份有限公司 | A kind of press quenching high-performance extrusion forming aluminum alloy materials and preparation method thereof |
-
2020
- 2020-02-28 CN CN202010127757.2A patent/CN111218591B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3642542A (en) * | 1970-02-25 | 1972-02-15 | Olin Corp | A process for preparing aluminum base alloys |
| JPH08225874A (en) * | 1995-02-14 | 1996-09-03 | Furukawa Electric Co Ltd:The | Aluminum alloy extruded material for automobile structural member and its production |
| JPH09249951A (en) * | 1996-03-12 | 1997-09-22 | Nippon Light Metal Co Ltd | Production of aluminum forged product having fine structure |
| JP2010159489A (en) * | 2008-12-09 | 2010-07-22 | Sumitomo Light Metal Ind Ltd | Method for molding 7,000 series aluminum alloy material, and formed product molded by the same |
| CN103993205A (en) * | 2014-04-16 | 2014-08-20 | 池州市光明塑钢有限公司 | High-elongation aluminum alloy section bar and making method thereof |
| CN105441749A (en) * | 2014-09-30 | 2016-03-30 | 黄晓艺 | Seven-series aluminum alloy material and preparation treatment process thereof |
| CN105821353A (en) * | 2016-06-14 | 2016-08-03 | 湖南大学 | Ageing heat-treatment process for improving Al-Zn-Mg strength |
| CN106319308A (en) * | 2016-11-23 | 2017-01-11 | 马鞍山市新马精密铝业股份有限公司 | Manufacturing method of 7000-series aluminum alloy section for vehicular bodies |
| CN108179333A (en) * | 2017-12-29 | 2018-06-19 | 福建祥鑫股份有限公司 | A kind of press quenching high-performance extrusion forming aluminum alloy materials and preparation method thereof |
Cited By (5)
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|---|---|---|---|---|
| CN111575616A (en) * | 2020-06-03 | 2020-08-25 | 苏州华尔铝业有限公司 | Preparation method of aluminum alloy section |
| CN113814657A (en) * | 2021-09-03 | 2021-12-21 | 福建祥鑫股份有限公司 | Aluminum-based composite material hot extrusion molding and heat treatment process thereof |
| CN113814657B (en) * | 2021-09-03 | 2022-09-13 | 福建祥鑫轻合金制造有限公司 | Aluminum-based composite material hot extrusion molding and heat treatment process thereof |
| WO2023165032A1 (en) * | 2022-03-02 | 2023-09-07 | 山东裕航特种合金装备有限公司 | Online quenching-based easily-extruded ultra-high-strength aluminum alloy, and manufacturing method therefor and application thereof |
| CN118028635A (en) * | 2024-02-01 | 2024-05-14 | 宁波环球铝业科技有限公司 | Production method of special 7006A aluminum alloy material |
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Denomination of invention: A Preparation Method of High Strength and Toughness 7XXX Aluminum Alloy Profile for New Energy Vehicle Power System Effective date of registration: 20220923 Granted publication date: 20200915 Pledgee: China Exim Bank Fujian branch Pledgor: FUJIAN XIANGXIN SHARES Co.,Ltd. Registration number: Y2022350000122 |