CN111636017A - Semisolid forming aluminum alloy and preparation method thereof - Google Patents
Semisolid forming aluminum alloy and preparation method thereof Download PDFInfo
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C21/00—Alloys based on aluminium
- C22C21/02—Alloys based on aluminium with silicon as the next major constituent
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- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
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- B22D17/007—Semi-solid pressure die casting
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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
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- 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
- C22F1/043—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 silicon as the next major constituent
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Abstract
In order to solve the problem that the aluminum alloy material in the existing semi-solid forming technology is difficult to meet the requirements of mechanical strength and toughness of the material, the invention provides a semi-solid forming aluminum alloy which comprises the following components in percentage by mass: 5.5 to 6.5 percent of Si, 2.5 to 3.5 percent of Cu, 0.3 to 0.4 percent of Mg, not more than 0.03 percent of Mn, 0.05 to 0.2 percent of Fe, not more than 0.03 percent of Ni, not more than 0.05 percent of Zn, 0.02 to 0.2 percent of Ti, 0.001 to 0.004 percent of B, 0.01 to 0.05 percent of Sr, the balance of Al and other elements, and the total amount of the other elements is not more than 0.1 percent. Meanwhile, the invention also discloses a preparation method of the semi-solid forming aluminum alloy. The aluminum alloy provided by the invention has higher yield strength and tensile strength, and has good elongation after fracture on the premise of qualification of the yield strength and tensile strength.
Description
Technical Field
The invention belongs to the technical field of alloy materials, and particularly relates to a semisolid forming aluminum alloy and a preparation method thereof.
Background
The defects of shrinkage cavity, shrinkage porosity, cracks, segregation and the like are usually generated when the aluminum alloy casting is produced by the traditional casting process, and the traditional casting process has low production efficiency and high energy consumption and cannot meet the requirements in the fields of automobile engines, engine parts and the like. However, the semi-solid rheological technology has own unique advantages that (1) the semi-solid slurry flows in a laminar flow mode in the cavity, so that the semi-solid slurry has less entrainment in the process of filling the mold, and has smaller solidification shrinkage and thermal stress tendency, therefore, the casting is compact and can be strengthened by heat treatment; (2) the casting has fine crystal grains, no macrosegregation and more uniform performance; (3) the semi-solid rheological forming is easy to form near net, and the machining amount is reduced; (4) the semi-solid rheoforming slurry has low temperature, small thermal shock to the die and long service life.
Based on the technical process characteristics of semi-solid rheological technology, Al-Si-Mg alloys such as 356 and 357 and the like are used in semi-solid rheological forming at present, the tensile strength of the Al-Si-Mg alloys subjected to T6 heat treatment is 260-320MPa, the yield strength is 180-250MPa, and the elongation is 3-5%, so that the requirements of structural members of equipment such as vehicles, communication and the like on material strength and toughness cannot be met.
Disclosure of Invention
The invention provides a semisolid forming aluminum alloy and a preparation method thereof, aiming at the problem that an aluminum alloy material in the existing semisolid forming technology cannot meet the mechanical strength performance requirement and the toughness requirement of the material easily.
The technical scheme adopted by the invention for solving the technical problems is as follows:
in one aspect, the invention provides a semi-solid formed aluminum alloy, which comprises the following components in percentage by mass:
5.5 to 6.5 percent of Si, 2.5 to 3.5 percent of Cu, 0.3 to 0.4 percent of Mg, not more than 0.03 percent of Mn, 0.05 to 0.2 percent of Fe, not more than 0.03 percent of Ni, not more than 0.05 percent of Zn, 0.02 to 0.2 percent of Ti, 0.001 to 0.004 percent of B, 0.01 to 0.05 percent of Sr, the balance of Al and other elements, and the total amount of the other elements is not more than 0.1 percent.
Optionally, the content of Si is 5.7-6.2%, the content of Cu is 2.9-3.2%, the content of Mg is 0.35-0.4%, the content of Mn is not more than 0.02%, the content of Fe is 0.1-0.15%, the content of Ni is not more than 0.03%, the content of Zn is not more than 0.04%, the content of Ti is 0.06-0.15%, the content of B is 0.002-0.003%, the content of Sr is 0.02-0.03%, the balance is Al and other elements, and the total amount of the other elements is not more than 0.1%.
Optionally, in the aluminum alloy, the content of Mn is 0.01-0.03%, the content of Ni is 0.01-0.03%, and the content of Zn is 0.02-0.05%.
Optionally, the other element includes one or both of Cr and Sn.
Optionally, the mass percentage of a single element of the other elements is not more than 0.05%.
In another aspect, the present invention also provides a semi-solid formed aluminum alloy, comprising the following steps:
weighing raw materials in required proportion according to the proportion of each element in the aluminum alloy, and adding the raw materials into a smelting furnace for smelting;
after refining and degassing treatment, casting to obtain an aluminum alloy ingot;
melting and deslagging the aluminum alloy cast ingot, filling inert gas into the graphite rotor which rotates, purifying the melt, pouring the melt into a crucible, and eccentrically rotating the crucible to prepare aluminum alloy semi-solid slurry;
and die-casting the aluminum alloy semi-solid slurry.
Optionally, the die-cast aluminum alloy is subjected to T4 heat treatment, wherein the heat treatment temperature is set to 467-.
Optionally, the die-cast aluminum alloy is subjected to T6 heat treatment, wherein the heat treatment temperature is set to 467-.
Optionally, the aluminum alloy has a tensile strength greater than 310MPa, a yield strength greater than 215MPa, and a post-fracture elongation greater than 17.0% after a T4 heat treatment.
Optionally, the aluminum alloy has a tensile strength greater than or equal to 390MPa, a yield strength greater than or equal to 310MPa, and a post-fracture elongation greater than or equal to 7.0% after a T6 heat treatment.
According to the semi-solid forming aluminum alloy provided by the invention, the requirements of mechanical strength property and toughness enhancement of the material are improved by adjusting the proportion control of each strengthening element in the aluminum alloy, and the advantages of the semi-solid forming technology are exerted, furthermore, the semi-solid forming aluminum alloy provided by the invention has better thermal stability, can be used for preparing accessories of automobile engines such as a turbocharging impeller, a cylinder cover, a crankcase of an internal combustion engine and the like, and can be used for preparing parts with high strength requirements due to high mechanical strength of the aluminum alloy so as to improve the safety of products and reduce the weight of the parts.
Drawings
FIG. 1 is a process diagram of the heat treatment of T4 and T6 provided by the present invention;
FIG. 2 is an optical metallographic representation of an aluminum alloy provided by the present invention before heat treatment in T4 and T6;
FIG. 3 is an optical metallographic representation of the aluminum alloy provided by the present invention after heat treatment of T4 and T6.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects solved by the present invention more apparent, the present invention is further described in detail below with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The embodiment of the invention provides a semi-solid forming aluminum alloy which comprises the following components in percentage by mass:
5.5 to 6.5 percent of Si, 2.5 to 3.5 percent of Cu, 0.3 to 0.4 percent of Mg, not more than 0.03 percent of Mn, 0.05 to 0.2 percent of Fe, not more than 0.03 percent of Ni, not more than 0.05 percent of Zn, 0.02 to 0.2 percent of Ti, 0.001 to 0.004 percent of B, 0.01 to 0.05 percent of Sr, the balance of Al and other elements, and the total amount of the other elements is not more than 0.1 percent.
According to the semi-solid forming aluminum alloy provided by the invention, the requirements of mechanical strength property and toughness enhancement of the material are improved by adjusting the proportion control of each strengthening element in the aluminum alloy, and the advantages of the semi-solid forming technology are exerted, furthermore, the semi-solid forming aluminum alloy provided by the invention has better thermal stability, can be used for preparing accessories of automobile engines such as a turbocharging impeller, a cylinder cover, a crankcase of an internal combustion engine and the like, and can be used for preparing parts with high strength requirements due to high mechanical strength of the aluminum alloy so as to improve the safety of products and reduce the weight of the parts.
In some embodiments of the invention, the Si content is 5.7-6.2%, the Cu content is 2.9-3.2%, the Mg content is 0.35-0.4%, the Mn content is not more than 0.02%, the Fe content is 0.1-0.15%, the Ni content is not more than 0.03%, the Zn content is not more than 0.04%, the Ti content is 0.06-0.15%, the B content is 0.002-0.003%, the Sr content is 0.02-0.03%, the balance is Al and other elements, the total amount of which is not more than 0.1%.
The addition of Si forms a eutectic silicon phase which is mainly precipitated with Al in a binary eutectic form. On one hand, the silicon phase is distributed at the grain boundary, so that the slippage of dislocation can be hindered, and the strength of the aluminum alloy is improved. On the other hand, Si has a large latent heat of solidification, and can form an Al and Si eutectic liquid phase with Al, thereby improving the fluidity of the alloy.
On one hand, the Cu element is introduced to play a role in solid solution strengthening, and on the other hand, the Cu element and Al form Al2Cu strengthening phase, Al2After the Cu strengthening phase is subjected to solid solution and aging treatment, the Cu strengthening phase is dispersed in an aluminum matrix, so that the alloy strength is improved.
Mg forms Al with Al, Cu and Si5Cu2Mg8Si6The strengthening effect of solid solution can be improved to a certain extent, and the strength of the aluminum alloy is improved.
The Fe element is mainly from a smelting tool. On one hand, Fe is a harmful element and can form a needle-shaped or sheet-shaped AlFeSi phase with Al and Si to crack a matrix, thereby reducing the performance of the alloy. On the other hand, Fe element has certain help for forming, and iron with certain content can help demoulding to reduce the phenomenon of sticking to the mould.
The Ti element is a grain refining element and can form heterogeneous nucleation particles, thereby achieving the effect of refining grains.
The B element is a grain refining element and can form TiB with Ti element2The particles can become nucleation particles, so that the nucleation rate is improved, and the grains are refined.
A part of Si element can form a eutectic silicon phase which is distributed with Al phase, and the shape of the eutectic silicon phase determines the performance of the alloy to a great extent. The addition of Sr can change the growth mode of eutectic silicon, change the shape of silicon into a fine worm shape, change Si into fine spherical particles after solution treatment, and improve the mechanical property of the material.
The α -Al matrix is the phase that precipitates the earliest when the alloy solidifies. Before the die casting, the solid phase in the semi-solid slurry is alpha-Al, which is obtained by controlling the temperature of the slurry and adjusting the content of the solid phase in the slurry. The alpha-Al phase is a matrix phase of the aluminum alloy.
After the semi-solid slurry is filled, fine secondary alpha-Al can be separated out when the semi-solid slurry is rapidly solidified in a cavity.
In some embodiments of the present invention, the aluminum alloy has a Mn content of 0.01 to 0.03%, a Ni content of 0.01 to 0.03%, and a Zn content of 0.02 to 0.05%.
In some embodiments of the invention, the other element comprises one or both of Cr and Sn.
Cr and Sn are impurity elements, and the introduction of impurities is minimized in the aluminum alloy, and in a more preferable embodiment, the aluminum alloy does not include the above-mentioned other elements.
In some embodiments of the invention, the mass percentage of individual elements of the other elements is no greater than 0.05%.
The embodiment of the invention also provides a semi-solid forming aluminum alloy, which comprises the following operation steps:
weighing raw materials in required proportion according to the proportion of each element in the aluminum alloy, and adding the raw materials into a smelting furnace for smelting;
after refining and degassing treatment, casting to obtain an aluminum alloy ingot;
melting and deslagging the aluminum alloy cast ingot, filling inert gas into the graphite rotor which rotates, purifying the melt, pouring the melt into a crucible, and eccentrically rotating the crucible to prepare aluminum alloy semi-solid slurry;
and die-casting the aluminum alloy semi-solid slurry.
In a more preferable embodiment of the invention, raw materials are weighed according to the ratio of elements in the aluminum alloy, wherein 99.95% of high-purity aluminum ingot, 99.9% of pure silicon, 99.95% of magnesium ingot, 99.5% of copper block, iron powder or wire, rod-shaped Al-5Ti-1B and rod-shaped Al-10Sr are selected as raw materials for proportioning. The furnace temperature is raised to 760-800 ℃, the pure aluminum ingot is heated and melted, and then the pure silicon, the iron powder or the iron wire and the copper block are added into the melt for melting. After the raw materials are completely melted, regulating the furnace temperature to 680-720 ℃, and adding magnesium ingot and Al-5Ti-1B, Al-10Sr into the melt for melting; and then stirring the melt by using a bionic turbulent flow permanent magnetic stirring method to uniformly distribute solute elements in the melt, and casting the melt into ingots after refining, degassing and purifying.
Firstly, heating the cast ingot to 760-780 ℃ for melting, then reducing the temperature of the melt to 720 ℃, and carrying out slag removing treatment; and blowing high-purity argon into the melt by using a graphite rotor, wherein the blowing time is 20-40 minutes, the rotor rotating speed is 400-600r/min, and standing for 20-40 minutes. The melt temperature was then adjusted downward to 680 ℃. And pouring a certain amount of melt into a cup-shaped steel crucible by using a quantitative spoon, wherein the casting temperature is 610-670 ℃, the eccentric rotation is 60-300s, and the rotation speed is 60-240r/min, so as to prepare the semi-solid slurry. And finally, transferring the slurry into a pressure chamber of a die-casting machine, wherein the slurry is injected at a speed of 0.1-1m/s and a specific pressure of 20-60MPa, the solidification pressure maintaining pressure is 60-120MPa, and the solidification pressure maintaining time is 15-60 s.
In some embodiments of the invention, the T4 heat treatment is performed on the die-cast aluminum alloy, the heat treatment temperature is set to 467-.
More preferably, the die-cast aluminum alloy is subjected to T4 heat treatment, wherein the heat treatment temperature is set to 470 ℃ for 4h, and then the heat treatment temperature is set to 510 ℃ for 2h and 40 min.
In some embodiments of the invention, the T6 heat treatment is performed on the die-cast aluminum alloy, the heat treatment temperature is set to 467-.
More preferably, the die-cast aluminum alloy is subjected to T6 heat treatment, the heat treatment temperature is set to 470 ℃ firstly, the treatment time is 4 hours, then the heat treatment temperature is set to 510 ℃, the treatment time is 2 hours and 40 minutes, the room-temperature standing time is more than 12 hours, and the artificial aging at 170 ℃ is carried out.
In the natural aging stage, a large number of GP zones are formed, the GP zones form a second phase which is coherent with the matrix in the subsequent artificial aging stage, and compared with the alloy which does not undergo the natural aging stage, the dispersion degree of the internal second phase is larger, so that the alloy has higher strength.
The heat treatment process diagram of T4 and T6 is shown in FIG. 1, the morphology of the eutectic phase of the alloy before heat treatment is shown in FIG. 2, the eutectic phase is vermicular, and the vermicular eutectic silicon is a continuous phase and can crack the matrix to a certain extent.
As shown in fig. 3, after the solution treatment, the strengthening phase is dissolved in α -Al in a solid solution, the eutectic silicon is spherical, the spherical eutectic silicon is dispersed, and the slippage of dislocations is hindered at the grain boundary, thereby increasing the strength of the material.
In some embodiments of the invention, the aluminum alloy has a tensile strength greater than 310MPa, a yield strength greater than 215MPa, and a post-fracture elongation greater than 17.0% after a T4 heat treatment.
In some embodiments of the invention, the aluminum alloy has a tensile strength greater than or equal to 390MPa, a yield strength greater than or equal to 310MPa, and a post-fracture elongation greater than or equal to 7.0% after a T6 heat treatment. The present invention will be further illustrated by the following examples.
Table 1 elemental composition in each example
Example 1
This example is used to illustrate the aluminum alloy and the method of making the same disclosed in the present invention, and includes the following steps:
weighing raw materials according to the required proportion as shown in Table 1, wherein 99.95% of high-purity aluminum ingot, 99.9% of pure silicon, 99.95% of magnesium ingot, 99.5% of copper block, iron powder or iron wire, rod-shaped Al-5Ti-1B and rod-shaped Al-10Sr are selected as raw materials to be proportioned. The furnace temperature is raised to 760-800 ℃, the pure aluminum ingot is heated and melted, and then the pure silicon, the iron powder or the iron wire and the copper block are added into the melt for melting. After the raw materials are completely melted, regulating the furnace temperature to 680-720 ℃, and adding magnesium ingot and Al-5Ti-1B, Al-10Sr into the melt for melting; and then stirring the melt by using a bionic turbulent flow permanent magnetic stirring method to uniformly distribute solute elements in the melt, and casting the melt into ingots after refining, degassing and purifying.
Heating the cast ingot to 760-780 ℃ for melting, then reducing the temperature of the melt to 720 ℃, and carrying out slag removing treatment; and blowing high-purity argon into the melt by using a graphite rotor, wherein the blowing time is 20-40 minutes, the rotor rotating speed is 400-600r/min, and standing for 20-40 minutes. The melt temperature was then adjusted downward to 680 ℃. And pouring a certain amount of melt into a cup-shaped steel crucible by using a quantitative spoon, wherein the casting temperature is 610-670 ℃, the eccentric rotation is 60-300s, and the rotation speed is 60-240r/min, so as to prepare the semi-solid slurry. And finally, transferring the slurry into a pressure chamber of a die-casting machine, wherein the slurry is injected at a speed of 0.1-1m/s and a specific pressure of 20-60MPa, the solidification pressure maintaining pressure is 60-120MPa, and the solidification pressure maintaining time is 15-60 s.
Respectively carrying out T4 heat treatment and T6 heat treatment on the die-cast aluminum alloy, wherein the T6 heat treatment is firstly carried out at the temperature of 470 ℃ for 4 hours, and then is carried out at the temperature of 510 ℃ for 2 hours and 40 minutes; after the solid solution of T6 heat treatment, the room temperature is kept for more than 12h, and then artificial aging at 170 ℃ is carried out.
Example 2
Example 2 is provided to illustrate the aluminum alloy and the method of manufacturing the same disclosed in the present invention, including most of the operating steps of example 1, except that:
the aluminum alloy components shown in the embodiment 2 in the table 1 are adopted, the mass of various required intermediate alloys or metal simple substances is calculated according to the mass content of the aluminum alloy components, and then the various intermediate alloys or metal simple substances are melted, mixed and cast into aluminum alloy ingots by a semi-solid forming technology. And then carrying out T6 heat treatment on the die-cast aluminum alloy to obtain the aluminum alloy.
Comparative example 1
The comparative example is used for comparatively explaining the aluminum alloy and the preparation method thereof disclosed by the invention, and comprises the following components in percentage by mass:
the 356 aluminum alloy is adopted for comparison, wherein the Si content is 6.5-7.5%, the Mg content is 0.25-0.45%, the Ti content is less than 0.2%, the Zn content is less than 0.05%, the Fe content is less than 0.09%, the Cu content is less than 0.05%, and the Mn content is less than 0.05%.
Comparative example 2
The comparative example is used for comparatively explaining the aluminum alloy and the preparation method thereof disclosed by the invention, and comprises the following components in percentage by mass:
the 357 aluminum alloy is adopted for comparison, wherein the content of Si is 6.5-7.5%, the content of Mg is 0.4-0.7%, the content of Ti is 0.04-0.2%, the content of Zn is less than 0.05%, the content of Fe is less than 0.2%, the content of Cu is less than 0.2%, and the content of Mn is less than 0.1%.
Comparative examples 3 to 4
Comparative examples 3 to 4 are used for comparative illustration of the aluminum alloy and the preparation method thereof disclosed by the invention, and comprise the following components in percentage by mass:
the aluminum alloy components shown in comparative examples 3-4 in the table 1 are adopted, the mass of various required intermediate alloys or metal simple substances is calculated according to the mass content of the aluminum alloy components, and then the various intermediate alloys or metal simple substances are melted, mixed and cast into aluminum alloy ingots by a semi-solid forming technology. And then carrying out T6 heat treatment on the die-cast aluminum alloy to obtain the aluminum alloy.
Performance testing
The following performance tests were performed on the aluminum alloys prepared in the above examples 1 to 2 and comparative examples 1 to 4:
and (3) testing tensile strength: GBT 228.1-2010 is adopted to test yield strength, tensile strength and elongation.
The test results obtained are filled in table 2.
TABLE 2
As can be seen from the test results of table 2:
the test results of comparative examples 1-2 and comparative examples 1-4 show that, compared with comparative examples 1-4 provided by the present invention, the aluminum alloy provided by the present invention has both better yield strength and tensile strength, and further has good elongation rate under the requirement of ensuring mechanical properties. The aluminum alloy provided by the invention has the requirements of improving the mechanical strength property and enhancing the toughness, exerts the advantages of the semi-solid forming technology and meets the requirements of industrial application on the strength and the toughness of the aluminum alloy.
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, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The semi-solid forming aluminum alloy is characterized by comprising the following components in percentage by mass:
5.5 to 6.5 percent of Si, 2.5 to 3.5 percent of Cu, 0.3 to 0.4 percent of Mg, not more than 0.03 percent of Mn, 0.05 to 0.2 percent of Fe, not more than 0.03 percent of Ni, not more than 0.05 percent of Zn, 0.02 to 0.2 percent of Ti, 0.001 to 0.004 percent of B, 0.01 to 0.05 percent of Sr, the balance of Al and other elements, and the total amount of the other elements is not more than 0.1 percent.
2. The aluminum alloy of claim 1, wherein the aluminum alloy comprises the following components in percentage by mass:
5.7 to 6.2 percent of Si, 2.9 to 3.2 percent of Cu, 0.35 to 0.4 percent of Mg, not more than 0.02 percent of Mn, 0.1 to 0.15 percent of Fe, not more than 0.03 percent of Ni, not more than 0.04 percent of Zn, 0.06 to 0.15 percent of Ti, 0.002 to 0.003 percent of B, 0.02 to 0.03 percent of Sr, the balance of Al and other elements, and the total amount of the other elements is not more than 0.1 percent.
3. The aluminum alloy of claim 1, wherein the aluminum alloy has a Mn content of 0.01-0.03%, a Ni content of 0.01-0.03%, and a Zn content of 0.02-0.05%.
4. The aluminum alloy of claim 1, wherein the other elements include one or both of Cr and Sn.
5. The aluminum alloy of claim 4, wherein individual elements of the other elements are not greater than 0.05% by mass of the aluminum alloy.
6. A method of producing a semi-solid formed aluminium alloy according to any one of claims 1 to 5, comprising the steps of:
weighing raw materials in required proportion according to the proportion of each element in the aluminum alloy, and adding the raw materials into a smelting furnace for smelting;
after refining and degassing treatment, casting to obtain an aluminum alloy ingot;
melting and deslagging the aluminum alloy cast ingot, filling inert gas into the graphite rotor which rotates, purifying the melt, pouring the melt into a crucible, and eccentrically rotating the crucible to prepare aluminum alloy semi-solid slurry;
and die-casting the aluminum alloy semi-solid slurry.
7. The aluminum alloy as recited in claim 6, wherein the die-cast aluminum alloy is subjected to T4 heat treatment, the heat treatment temperature is set to 467- > 472 ℃ and the treatment time is set to 3.5h-4.5h, and then the heat treatment temperature is set to 508- > 512 ℃ and the treatment time is set to 2h30min-2h50 min.
8. The aluminum alloy as recited in claim 6, wherein the aluminum alloy obtained by die casting is subjected to T6 heat treatment, the heat treatment temperature is set to 467- > DEG C, the treatment time is set to 3.5-4.5 h, the heat treatment temperature is set to 508- > 512 ℃, the treatment time is set to 2h 30-2 h50min, then the aluminum alloy is opened, immersed in water or a high-cooling medium at room temperature for rapid cooling, the aluminum alloy is placed at room temperature for 12-24h, and finally the treatment temperature is set to 167- > 174 ℃, and artificial aging is performed for 9.5-10.5 h.
9. The aluminum alloy of claim 7, wherein the aluminum alloy has been subjected to a T4 heat treatment having a tensile strength greater than 310MPa, a yield strength greater than 215MPa, and a post fracture elongation greater than 17.0%.
10. The aluminum alloy of claim 8, wherein the aluminum alloy has been subjected to a T6 heat treatment having a tensile strength greater than or equal to 390MPa, a yield strength greater than or equal to 310MPa, and a post-fracture elongation greater than or equal to 7.0%.
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| WO2022122410A1 (en) * | 2020-12-07 | 2022-06-16 | Norsk Hydro Asa | A high temperature stable alsicu alloy |
| CN115786783A (en) * | 2022-12-30 | 2023-03-14 | 中国重汽集团济南动力有限公司 | Semisolid die-casting aluminum alloy and application thereof |
| CN115896553A (en) * | 2021-08-31 | 2023-04-04 | 通用汽车环球科技运作有限责任公司 | Aluminum alloy for casting high strength and high conductivity parts |
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| CN115786783A (en) * | 2022-12-30 | 2023-03-14 | 中国重汽集团济南动力有限公司 | Semisolid die-casting aluminum alloy and application thereof |
| CN115786783B (en) * | 2022-12-30 | 2024-04-05 | 中国重汽集团济南动力有限公司 | Semi-solid die-casting aluminum alloy and application thereof |
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