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High-specific-modulus aluminum alloy and preparation method thereof

A technology of aluminum alloy and high specific modulus, applied in the field of new metal structural materials, can solve the problem of low specific modulus

Active Publication Date: 2021-04-27
CENT SOUTH UNIV
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  • Summary
  • 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, while Al-Li alloy has a relatively high specific strength (180-220MPa.cm 3 / g) and specific modulus (27-31GPa.cm 3 / g), but its specific modulus has been further improved

Method used

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  • High-specific-modulus aluminum alloy and preparation method thereof

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Embodiment 1

[0024] The composition of the alloy and its weight percentage are Al-3Li-5.3Mn-0.1Zr. Raw materials are added in the form of pure aluminum, pure lithium, Al-10Mn alloy and Al-4Zr alloy. Alloy smelting is smelted and cast in a vacuum melting furnace, and then hot-extruded into a 12mm plate. After solution treatment, the alloy is water quenched at room temperature and aged at 145°C for 48 hours. The density, modulus and specific modulus of the material are listed in Table 1.

Embodiment 2

[0026] The composition of the alloy and its weight percentage are Al-2.5Li-1Mn-0.3Zr. Raw materials are added in the form of pure aluminum, pure lithium, Al-10Mn alloy and Al-4Zr alloy. The alloy is smelted and cast in a vacuum melting furnace, and then hot-rolled into a 15mm plate. After the alloy is solution treated, it is water quenched at room temperature and aged at 150°C for 40 hours. The density, modulus and specific modulus of the material are listed in Table 1.

Embodiment 3

[0028] The composition of the alloy and its weight percentage are Al-3Li-7Mn-0.05Zr. Raw materials are added in the form of pure aluminum, pure lithium, Al-10Mn alloy and Al-4Zr alloy. The alloy is smelted and cast in a vacuum melting furnace, and then hot-rolled into a 15mm plate. After the alloy is solution treated, it is water quenched at room temperature and aged at 150°C for 40 hours. The density, modulus and specific modulus of the material are listed in Table 1.

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Abstract

The invention relates to a high-specific-modulus aluminum alloy. The alloy is prepared from, by mass, 2%-4% of Li, 1%-7% of Mn, 0.05%-0.3% of Zr, 0.0%-0.3% of Ti, 0.0%-0.3% of Sc and the balance of Al. Li and Mn are necessary elements for improving the modulus of the aluminum alloy, and Zr, Ti and Sc are grain control elements. The preparation method comprises the following steps of weighing the components according to a designed aluminum alloy component proportion, smelting in a vacuum smelting furnace, casting, molding, and carrying out thermal deformation to form a bar or a plate. The aluminum alloy with high modulus and high specific modulus is prepared by adopting a smelting casting and deformation heat treatment method and controlling the contents of alloy elements (Li and Mn) with increased modulus and the grain control elements Zr, Ti and Sc. An aluminum-manganese-lithium alloy with modulus higher than that of the existing aluminum alloy is prepared, the preparation process is simple, and the alloy can be used as a light structural material with high specific stiffness.

Description

technical field [0001] The invention relates to a high specific modulus aluminum alloy and a preparation method thereof, belonging to new metal structural materials. Background technique [0002] As the backbone material of air, land and water vehicles, aluminum alloy is cost-effective and widely used. High-modulus aluminum alloy plays a decisive role in achieving weight reduction, efficiency increase and long life, and is indispensable. High modulus is a common feature of high-performance aluminum alloys. Under similar strength conditions, greatly increasing the elastic modulus of aluminum alloys to increase the specific modulus is the main development direction for achieving weight reduction and efficiency enhancement of vehicles. [0003] High-performance aluminum alloys for aviation mainly include Al-Zn-Mg-Cu aluminum alloys of the 7XXX 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),...

Claims

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Application Information

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IPC IPC(8): C22C21/00C22C1/03C22F1/04
CPCC22C21/00C22C1/03C22C1/026C22F1/04C22F1/002
Inventor 肖代红刘文胜黄兰萍
Owner CENT SOUTH UNIV
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