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Aluminum-lithium alloy and forging method

A technology of aluminum-lithium alloy and alloy composition, which is applied in the field of metal material engineering, can solve the problems of residual original grain boundaries, unsuitability for manufacturing large and thick parts with a thickness of more than 40mm, and low elongation in the high direction, so as to improve the elongation in the high direction Effect

Active Publication Date: 2018-05-08
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Critically saturated alloying elements will produce a large number of grain boundary precipitated phases. These phases have a "pinning" effect in the plastic forming process, resulting in a large number of original grain boundary residues, resulting in low elongation in the high direction, which is not suitable for manufacturing large thickness specifications above 40mm parts

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0020] Alloy composition: 4.0%Cu, 0.8%Mg, 1.2%Li, 0.4%Ag, 0.10%Zr, 0.4%Mn, 0.4%Zn, Si≤0.08%, Fe≤0.10%, other impurities individually≤0.05%, total ≤0.15%, the balance is Al.

[0021] Homogenization treatment: heat the blank to 420°C, holding time for 2h; continue to heat up to 480°C, holding time for 38 hours; cool down to 200°C with the furnace, and air-cool to room temperature;

[0022] Ingot forging and blanking: the initial forging temperature is 380 °C, the final forging temperature is 350 °C, and the forging ratio is 3;

[0023] Low temperature forging: the initial forging temperature is 340℃, and the forging ratio is 2.6;

[0024] High temperature forging: the initial forging temperature is 400 °C, the final forging temperature is 380 °C, and the forging ratio is 4.

Embodiment 2

[0026] Alloy composition: 4.0%Cu, 0.4%Mg, 1.2%Li, 0.4%Ag, 0.10%Zr, 0.4%Mn, Si≤0.08%, Fe≤0.10%, other impurities individually≤0.05%, total amount≤0.15%, The remainder is Al.

[0027] Homogenization treatment: heat the blank to 420°C, holding time for 6h; continue to heat up to 490°C, holding time for 40 hours; cool to 200°C with the furnace, and air-cool to room temperature;

[0028] Ingot forging and blanking: the initial forging temperature is 400 °C, the final forging temperature is 300 °C, and the forging ratio is 3.3;

[0029] Low temperature forging: the initial forging temperature is 340℃, and the forging ratio is 2.6;

[0030] High temperature forging: the initial forging temperature is 410 °C, the final forging temperature is 380 °C, and the forging ratio is 4.2.

Embodiment 3

[0032] Alloy composition: 3.2%Cu, 1.2%Mg, 1.0%Li, 0.4%Ag, 0.10%Zr, 0.4%Mn, Si≤0.08%, Fe≤0.10%, other impurities individually≤0.05%, total amount≤0.15%, The remainder is Al.

[0033] Homogenization treatment: heat the blank to 430°C, holding time for 8h; continue to heat up to 500°C, holding time for 45 hours; cool to 200°C with the furnace, and air-cool to room temperature;

[0034] Ingot forging and blanking: the initial forging temperature is 420 °C, the final forging temperature is 350 °C, and the forging ratio is 4;

[0035] Low temperature forging: the initial forging temperature is 260℃, and the forging ratio is 2.7;

[0036] High temperature forging: the initial forging temperature is 420 °C, the final forging temperature is 380 °C, and the forging ratio is 4.5.

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Abstract

The invention belongs to the field of metallic material engineering and relates to an aluminum-lithium alloy material and a forging method thereof. The aluminum-lithium alloy material comprises the alloy components of, by mass, 3%-4.2% of Cu, 0.2%-1.4% of Mg; 0.6%-1.5% of Li, 0-1% of Ag, 0.06%-0.15% of Zr, 0.2%-0.6% of Mn, 0-0.8% of Zn, 0.08% of Si or the less, 0.10% of Fe or the less and the balance Al and other impurities, wherein the mass of one of the other impurities is smaller than or equal to 0.05%, and the total mass of the other impurities is smaller than or equal to 0.15%. The forging method comprises the following steps of homogenization treatment and forging. According to the aluminum-lithium alloy material and the forging method thereof, the situation that a large number of grain boundary precipitation phases are generated by critical saturated alloy elements, and thus a large number of original grain boundary residues are caused can be avoided, the high elongation rate isincreased, and the requirement for manufacturing workpieces with the large thickness specifications of 40 mm or above is met.

Description

technical field [0001] The invention belongs to the field of metal material engineering, and relates to an aluminum-lithium alloy material and a forging method thereof. Background technique [0002] Due to the addition of lithium element, aluminum-lithium alloy has obtained the characteristics of low density and high modulus, and has broad application prospects in aerospace, nuclear industry, transportation, sporting goods, weapons and other fields. In recent years, with the improvement of aluminum metallurgy equipment technology and basic metallurgical technology level, the development trend of aluminum alloy is high purity, high performance and high alloying. The 500MPa grade aluminum-lithium alloy has been maturely applied in advanced fighter aircraft, large passenger aircraft and space carrier equipment. The amount of alloying elements added in current Al-Li alloys approaches or exceeds the high-temperature critical saturated solid solubility of Al solid solution. Crit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/18C22F1/057
CPCC22C21/14C22C21/16C22C21/18C22F1/057
Inventor 冯朝辉王胜强何维维陆政
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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