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A kind of high specific strength and high specific modulus aluminum alloy and preparation method thereof

An aluminum alloy, high specific modulus technology, applied in the field of non-ferrous metal materials, can solve the problems of only 1.3% elongation, low strength and elastic modulus, low corrosion resistance, etc. Effects of specific strength and specific modulus

Active Publication Date: 2022-03-04
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

7XXX series aluminum alloy has high specific strength (180-208MPa.cm 3 / g), but its specific modulus is low (no more than 25GPa.cm 3 / g)
The specific strength of 2XXX series Al-Cu-Mg aluminum alloy (140-170MPa.cm 3 / g) and specific modulus (26-27GPa.cm 3 / g) are low, and the specific strength of the existing Al-Li alloy (180-220MPa.cm 3 / g) and specific modulus (27-30GPa.cm 3 / g), but its specific strength and specific modulus are further improved
[0003] SRIVATSAN et al. (Journal of Materials Science, 1996, 330-3313) prepared a high-lithium-content aluminum alloy by high-pressure sintering method. The specific modulus reached 31.4GPa.cm3 / g, but its specific strength was only 141MPa.cm 3 / g, and because of the high lithium content, processing is more difficult
In addition to alloys, researchers have also developed particle-reinforced aluminum matrix composites with high specific modulus. For example, Li Xiangfeng et al. developed in-situ self-generated TiB 2 The reinforced Al–3.3Cu–1.0Li composite material has an elastic modulus of 83GPa and a specific modulus of 30GPa.cm 3 / g, but the elongation is only 1.3% (Materials Science and Engineering: A, 2019, 742: 573-583)
And the in-situ self-generated 2wt.%TiB2 particle reinforced Al-12.5Si alloy matrix composite material, although its elastic modulus can reach 100GPa, specific modulus can reach 36GPa.cm3 / g, but its tensile strength is 380MPa, specific strength is lower than 140MPa.cm 3 / g, and the elongation is less than 2%, it cannot be used as a large-scale aerospace material component
A kind of ultra-high-strength aluminum-lithium alloy and preparation method thereof (Chinese patent, CN110423927 A) has proposed a kind of aluminum-lithium alloy of high copper and high zinc content, and its composition Cu4.3~5.2%, Li 0.8~1.2%, Mg 0.3~ 0.7%, Ag0.1~0.5%, Zn 0.81~1.5%, Mn 0.1~0.2%, Zr 0.1~0.2%, Sc 0.09~0.3%, Cu / Li mass fraction ratio 4.3~6.5, but the alloy is due to copper, Higher Zn content, resulting in a density greater than 2.72g / cm 3 , while the corrosion resistance is relatively lower than that of ordinary Al-Mg aluminum alloys
However, ordinary Al-Mg aluminum alloys have low strength and elastic modulus (the tensile strength is lower than 400MPa, and the elastic modulus is lower than 70GPa), which cannot meet the requirements of high specific strength and high specific modulus. Homogenization treatment prolongs the time, increases energy consumption and production cost

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  • A kind of high specific strength and high specific modulus aluminum alloy and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0030] The composition and weight percentage of the alloy are Al-3.5Mg-1.7Li-1.6Cu-0.1Zr-0.2Sc. The preparation method is as follows: under vacuum, put pure aluminum, pure magnesium, pure lithium, aluminum-zirconium master alloy, and aluminum-scandium master alloy into a smelting furnace to melt, degas and remove slag through argon gas, and cast it statically. The ingot is subjected to two-stage soaking treatment. The soaking process is: 350°C for 4 hours, and then heated to 500°C for 24 hours. After soaking, the ingot is extruded into a plate at 480°C. The hot extruded sheet alloy was kept at 520°C for 3h. After solution treatment, water-cooled to room temperature, pre-deformed by 5%, and then heated at 145°C for 36 hours to obtain the finished product. Its performance is shown in Table 1.

Embodiment 2

[0032] The composition and weight percentage of the alloy are Al-3.5Mg-1.7Li-1.6Cu-0.1Zr-0.2Sc. The preparation method is as follows: under vacuum, put pure aluminum, pure magnesium, pure lithium, aluminum-zirconium master alloy, and aluminum-scandium master alloy into a smelting furnace to melt, degas and remove slag through argon gas, and cast it statically. The ingot is subjected to two-stage soaking treatment. The soaking process is: 350°C for 4 hours, and then heated to 500°C for 24 hours. The soaked ingot is hot-rolled at 450°C to form a plate, which is annealed at 400°C and then cold-rolled into a thin plate. The thin sheet alloy was kept at 510°C for 2h. After solution treatment, water-cooled to room temperature, pre-deformed by 5%, and then heated at 180°C for 4 hours to obtain the finished product. Its performance is shown in Table 1.

Embodiment 3

[0034] The composition and weight percentage of the alloy are Al-3.0Mg-2.5Li-2.0Cu-0.2Zr-0.1Sc-0.1Mn. The preparation method is as follows: under vacuum, put pure aluminum, pure magnesium, pure lithium, aluminum-zirconium master alloy, and aluminum-scandium master alloy into a smelting furnace to melt, degas and remove slag through argon gas, and cast it statically. The ingot is subjected to two-stage soaking treatment. The soaking process is: 300°C for 4 hours, then heated to 480°C for 12 hours. The soaked ingots were extruded into plates at 460°C. The hot extruded sheet alloy was kept at 480°C for 5h. After solution treatment, water-cooled to room temperature, pre-deformed by 10%, and then heated at 150°C for 50 hours to obtain the finished product. Its performance is shown in Table 1.

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Abstract

The invention relates to a high specific strength and high specific mold aluminum alloy and a preparation method thereof. The alloy includes the following components in mass percentage: Mg 3-6%, Li 1.5-2.5%, Cu 0.05-2.0%, Zr 0.08-0.2%, Zn 0.4-0.8%, Mn 0.0-0.2%, Sc 0.0 ~0.2%, the balance is Al. The preparation method is as follows: according to the designed distribution ratio of the aluminum alloy components, each component is weighed, and an ingot is formed by vacuum melting and casting, and then undergoes double-stage soaking treatment, hot extrusion or rolling, solid solution and isothermal aging heat treatment. Adopted in the present invention, the content and ratio of the main elements (Mg, Li) are controlled, the content of the trace strengthening elements (Cu, Zn) and the grain control elements (Zr, Mn, Sc) are controlled on the composition, and the two-stage equalization is adopted on the process. The synergistic treatment of thermal annealing process, solid solution process, pre-deformation and aging treatment process conditions finally obtains an aging-strengthened aluminum alloy with excellent performance. The obtained aluminum alloy has superior specific strength and specific modulus.

Description

technical field [0001] The invention relates to a high specific strength and high specific mold aluminum alloy and a preparation method thereof, belonging to the field of nonferrous metal materials. Background technique [0002] High-performance aluminum alloys for aerospace mainly include Al-Zn-Mg-Cu aluminum alloys of the 7XXXX series and Al-Cu-Mg and Al-Li alloys of the 2XXXX series. 7XXX series aluminum alloy has high specific strength (180-208MPa.cm 3 / g), but its specific modulus is low (no more than 25GPa.cm 3 / g). The specific strength of 2XXX series Al-Cu-Mg aluminum alloy (140-170MPa.cm 3 / g) and specific modulus (26-27GPa.cm 3 / g) are low, and the specific strength of the existing Al-Li alloy (180-220MPa.cm 3 / g) and specific modulus (27-30GPa.cm 3 / g), but its specific strength and specific modulus are further improved. [0003] SRIVATSAN et al. (Journal of Materials Science, 1996, 330-3313) prepared a high-lithium-content aluminum alloy by high-pressure s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/06C22C1/03C22F1/047
CPCC22C21/06C22C1/03C22F1/047
Inventor 肖代红刘文胜王新凯吴名冬黄兰萍颜宁
Owner CENT SOUTH UNIV