Solid-solution pre-treatment method for improving strength and plasticity and toughness of aluminum lithium alloy thin sheet and heat treatment method thereof

A heat treatment method and aluminum-lithium alloy technology, which is applied in the field of aluminum-lithium alloys, can solve the problems that limit the wide application of aluminum-lithium alloys, low plasticity and toughness, and severe alloy anisotropy.

Active Publication Date: 2017-03-08
CENT SOUTH UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] With the development of application requirements and the improvement of metallurgical technology, aluminum-lithium alloys have experienced three stages of development, of which the first stage spans from the 1950s to the 1960s. The alloy was applied to the wing skin and tail level stabilizer of the early warning aircraft, achieving a weight reduction of 6%, but the level of plasticity and toughness was too low; the second stage spanned from the 1970s to the late 1980s, with 1420 Alloys are low-density, medium-strength, damage-resistant, and high-strength aluminum-lithium alloys, but there are problems with severe alloy anisotropy and low levels of plasticity and toughness; the third stage began in the 1990s, with high-strength weldable The 1460 al

Method used

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  • Solid-solution pre-treatment method for improving strength and plasticity and toughness of aluminum lithium alloy thin sheet and heat treatment method thereof
  • Solid-solution pre-treatment method for improving strength and plasticity and toughness of aluminum lithium alloy thin sheet and heat treatment method thereof
  • Solid-solution pre-treatment method for improving strength and plasticity and toughness of aluminum lithium alloy thin sheet and heat treatment method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] Al-Cu-Li aluminum alloy thin plate, containing 3.6% Cu, 1.0% Li and 0.12% Zr, the rest is Al, the thickness of the thin plate is 2mm, obtained by 70% cold deformation treatment.

[0080] The above-mentioned aluminum-lithium alloy is subjected to a solid solution pretreatment method of controlling the heating rate, and the temperature is raised from 20°C to 500°C with the furnace, and the heating rate is controlled at 2°C / min, and then directly carried out in the salt bath furnace heated to 500°C for 40 minutes. After the solution treatment at 500°C, place it in 5°C water for 5 minutes of quenching treatment. After the quenching treatment, perform 3% pre-deformation treatment, and then directly perform artificial aging treatment. The aging temperature is 150°C and the time is 16 hours. Heat treatment of Al-Li alloys.

[0081] A tensile mechanical property test was carried out, and the test results showed that the tensile strength was 591MPa, the yield strength was 570MPa, ...

Embodiment 2

[0083] Al-Cu-Li aluminum alloy thin plate, containing 3% Cu, 1.2% Li and 0.12% Zr, the rest is Al, the thickness of the thin plate is 5mm, obtained by 50% cold deformation treatment.

[0084] The above-mentioned aluminum-lithium alloy is subjected to a solid solution treatment method of controlling the heating rate. The temperature is raised from 25°C to 510°C with the furnace, and the heating rate is controlled at 4°C / min. After the solid solution treatment at 50°C, quenching treatment was carried out in 50°C water for 1 min. After the quenching treatment, 3% pre-deformation treatment was performed, and then artificial aging treatment was directly carried out. The aging temperature was 175°C, and the time was 12h. Heat treatment of Al-Li alloys.

[0085] A tensile mechanical property test was carried out, and the test results showed that the tensile strength was 567MPa, the yield strength was 544MPa, and the elongation was 8.6%.

Embodiment 3

[0087] Al-Cu-Li aluminum alloy thin plate, containing 3.6% Cu, 0.6% Li and 0.15% Zr, the rest is Al, the thickness of the thin plate is 6mm, obtained by 50% cold deformation treatment.

[0088] The above-mentioned aluminum-lithium alloy is subjected to a solid solution treatment method of controlling the heating rate. From 20 ° C to 500 ° C with the furnace, the heating rate is controlled at 7 ° C / min, and then directly in the salt bath furnace heated to 500 ° C for 40 minutes. After the solid solution treatment at 26°C, it was quenched in water at 26°C for 2.5 minutes. After the quenching treatment, it was subjected to 3% pre-deformation treatment, and then it was directly subjected to artificial aging treatment. The aging temperature was 150°C, and the time was 16 hours. Heat treatment of the aluminum-lithium alloy.

[0089] A tensile mechanical property test was carried out, and the test results showed that the tensile strength was 569MPa, the yield strength was 546MPa, a...

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Abstract

The invention provides a solid-solution pre-treatment method for improving strength and plasticity and toughness of an aluminum lithium alloy thin sheet. The method is characterized in that the solid-solution pretreatment is carried out on the aluminum lithium alloy in a temperature increase rate controlling manner, wherein the temperature increase rate of the solid-solution pre-treatment is 2 to 15 DEG C per minute; the initial temperature in temperature increase of the solid-solution pre-treatment is 20 to 25 DEG C, and the end temperature in the temperature increase of the solid-solution pre-treatment is 500 to 510 DEG C. According to the solid-solution treatment method, the aluminum lithium alloy is treated by temperature increase at the rate of 2 to 15 DEG C per minute, thus influencing the form and distribution of recrystallized grain to generate a textured structure form. Therefore, the comprehensive mechanical property of the aluminum lithium alloy thin sheet can be improved, and the strength and the plasticity and toughness can be improved.

Description

technical field [0001] The invention relates to the technical field of aluminum-lithium alloys, in particular to a solid-solution pretreatment method for improving the strong plasticity of aluminum-lithium alloy thin plates and a heat treatment method thereof. Background technique [0002] The strong plasticity of metal refers to the simultaneous improvement of the strength and plasticity of the material after cold processing or heat treatment. [0003] Al-Li alloys have become the most ideal structural materials for aerospace due to their low density and excellent mechanical properties. According to the application requirements of different aerospace backgrounds, designing aluminum-lithium alloys with different properties is the development direction of aluminum-lithium alloys. Use the comprehensive mechanical properties of materials or reduce the density of aluminum-lithium alloys through structural weight reduction, reduce rocket launch costs, increase thrust-to-weight r...

Claims

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Application Information

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IPC IPC(8): C22F1/057C22C21/12
CPCC22C21/12C22F1/002C22F1/057
Inventor 李劲风刘丹阳蔡文鑫郑子樵陈永来张绪虎许秀芝
Owner CENT SOUTH UNIV
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