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Heat treatment method for spray-formed aluminum-lithium alloy

A heat treatment method and technology of aluminum-lithium alloy, applied in the direction of improving process efficiency, improving energy efficiency, etc., can solve the problems of coarse grains in the core, segregation of smelting and casting technology, etc., to improve the density, improve the comprehensive performance, increase the position The effect of wrong density

Pending Publication Date: 2022-05-24
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the preparation process of aluminum-lithium alloy is mainly the traditional semi-continuous casting method, but the smelting and casting technology has problems such as serious segregation and coarse core grains.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Using the method for improving the comprehensive performance of the aluminum-lithium alloy involved in the present invention, the alloy composition and weight percentage are: Cu 3.89%, Li 1.01%, Mg 0.47%, Ag 0.31%, Zr 0.12%, Fe 0.04%, Si 0.06% , and the spray-formed sheet with the balance of Al is subjected to solution treatment, the solution temperature is 510 ° C, and the temperature is kept for 2 hours. After the heat preservation, water quenching is performed. The quenched alloy was stretched and cold deformed by a stretching machine, and the deformation amount was 4%, and then the aging treatment was carried out, and the aging temperature was 165 °C, and the temperature was kept for 27 h. After the insulation is completed, take out and cool to room temperature. After the heat treatment, the tensile test is carried out on the material. The tensile test is carried out in accordance with GB / T 228.1-2010 "Tensile Test of Metal Materials". The tensile rate is 3mm / s, and...

Embodiment 2

[0019] The spray-formed aluminum-lithium alloy plate with the same alloy composition as in Example 1 was used for solution treatment. The solution temperature was 510°C, and the temperature was kept for 2 hours. After the heat preservation, water quenching was performed. The transfer time was limited to 10s until the alloy was quenched. through. The quenched alloy was stretched and cold deformed by a stretching machine, and the deformation amount was 6%, and then the aging treatment was carried out, and the aging temperature was 175 °C, and the temperature was kept for 18 h. After the insulation is completed, take out and cool to room temperature. After the heat treatment, the tensile test is carried out on the material. The tensile test is carried out in accordance with GB / T 228.1-2010 "Tensile Test of Metal Materials". The tensile rate is 3mm / s, and the tensile strength, yield strength and elongation of the material are measured. , and the test results are shown in Table 1....

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Abstract

The invention discloses a heat treatment method for spray-formed aluminum-lithium alloy, and belongs to the technical field of heat treatment of aluminum-lithium alloy. The alloy component Cu is 3.7 to 4.0 percent; 0.8% to 1.2% of Li; 0.25 to 0.80 percent of Mg; 0.25 to 0.60 percent of Ag; 0.08% to 0.16% of Zr; the aluminum alloy comprises, by weight, 0.15%-0.15% of Fe, 0.12%-0.12% of Si, 0.15%-0.15% of And the spray-formed aluminum-lithium alloy ingot blank is subjected to hot extrusion deformation at a certain temperature, and after being formed into a plate, the plate is rapidly cooled to the room temperature. And then the extruded plate is subjected to solid solution quenching, cold deformation and artificial aging treatment. And cold deformation before aging inhibits cubic sigma phase precipitation, so that more T1 and theta'strengthening phases are fine and densely distributed. Experiments show that the process provided by the invention improves the mechanical properties of the alloy.

Description

technical field [0001] The invention belongs to the technical field of heat treatment of aluminum-lithium alloys, and in particular relates to a heat treatment method for spray-forming aluminum-lithium alloys. Background technique [0002] With the development of my country's aerospace industry, material weight reduction has become the eternal pursuit of scientific and technological personnel. Lithium is the lightest metal element found so far. Adding 1% of lithium to aluminum alloy can reduce the density of the alloy by 3% and increase the elastic modulus by 6%. Therefore, the research on aluminum-lithium alloys has always attracted much attention. . At present, the aluminum-lithium alloy has been developed to the third generation, with low density, high modulus, good strength and toughness matching, low anisotropy, and good stress corrosion resistance and machinability, which is better than composite materials and traditional aluminum alloys. More significant competitive...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/057B22F3/115B22D23/00B22F3/24C21D8/00C22C21/16
CPCC22F1/057C22F1/002B22F3/115B22D23/003B22F3/24C21D8/00C22C21/14C22C21/16B22F2003/248Y02P10/25
Inventor 黄晖高文静文胜平魏午高坤元吴晓蓝荣莉
Owner BEIJING UNIV OF TECH
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