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Short-process preparation method of high-toughness aluminum-lithium alloy sheet

An aluminum-lithium alloy, short-process technology, which is applied in the field of short-process preparation of high-strength and tough aluminum-lithium alloy sheets, can solve the problems of low strength, poor plasticity, toughness and formability, and high manufacturing costs of aluminum-lithium alloy sheets, and shorten the peak aging time , Excellent comprehensive mechanical properties, solve the effect of low strength

Active Publication Date: 2021-06-18
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a short-process preparation method of rolling forming and deformation cryogenic heat treatment strengthening of aluminum-lithium alloy to solve the problems of low strength, poor ductility and formability, complicated process and high manufacturing cost of aluminum-lithium alloy sheet Technical challenges to achieve low-cost preparation of high-performance Al-Li alloy sheets

Method used

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  • Short-process preparation method of high-toughness aluminum-lithium alloy sheet
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  • Short-process preparation method of high-toughness aluminum-lithium alloy sheet

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Embodiment 1

[0043] Step 1: According to the mass percentage of elements: Li is 1.5%, Cu is 2.8%, Mg is 0.25%, Zr is 0.12%, Mn is 0.3% and the balance is aluminum. Weigh pure magnesium block, pure lithium grain, Al-50Cu master alloy, Al-5Zr master alloy, Al-20Mn master alloy and pure aluminum block as raw materials;

[0044] Step 2: Add pure aluminum blocks, aluminum-copper master alloys, aluminum-zirconium master alloys, and aluminum-manganese master alloys into the graphite crucible, add high-purity LiF-LiCl flux with a mass percentage of 1:4 to cover, and pass into the melting furnace Ar gas protection gas for melting, smelting in a well-type resistance furnace at a temperature of 730°C for 0.5h, after the aluminum and aluminum intermediate alloys are melted and slag removed, add pure magnesium and pure lithium wrapped in aluminum foil, in an Ar gas protection atmosphere Keep it warm at 730°C for 0.5h. When adding magnesium and lithium, use graphite rods to press into the bottom of the ...

Embodiment 2

[0054] Step 1: According to the mass percentage of elements: Li is 1.5%, Cu is 2.8%, Mg is 0.25%, Zr is 0.12%, Mn is 0.3% and the balance is aluminum. Weigh pure magnesium block, pure lithium grain, Al-50Cu master alloy, Al-5Zr master alloy, Al-20Mn master alloy and pure aluminum block as raw materials;

[0055] Step 2: Add pure aluminum blocks, aluminum-copper master alloys, aluminum-zirconium master alloys, and aluminum-manganese master alloys into the graphite crucible, add high-purity LiF-LiCl flux with a mass percentage of 1:4 to cover, and pass into the melting furnace Ar gas shielding gas for melting, smelting in a well-type resistance furnace at a temperature of 720°C for 0.3h, after the aluminum and aluminum intermediate alloys are melted and slag removed, add pure magnesium and pure lithium wrapped in aluminum foil, and in Ar gas protective atmosphere Keep warm at 720°C for 0.3h, when adding magnesium and lithium, use graphite rods to press into the bottom of the mol...

Embodiment 3

[0065] Step 1: According to the mass percentage of elements: Li is 1.5%, Cu is 2.8%, Mg is 0.25%, Zr is 0.12%, Mn is 0.3% and the balance is aluminum. Weigh pure magnesium block, pure lithium grain, Al-50Cu master alloy, Al-5Zr master alloy, Al-20Mn master alloy and pure aluminum block as raw materials;

[0066] Step 2: Add pure aluminum blocks, aluminum-copper master alloys, aluminum-zirconium master alloys, and aluminum-manganese master alloys into the graphite crucible, add high-purity LiF-LiCl flux with a mass percentage of 1:4 to cover, and pass into the melting furnace Ar gas protection gas for melting, smelting in a well-type resistance furnace at a temperature of 740°C for 0.5h, after the aluminum and aluminum intermediate alloys are melted and slag removed, add pure magnesium and pure lithium wrapped in aluminum foil, and in an Ar gas protection atmosphere Keep it warm at 740°C for 0.5h. When adding magnesium and lithium, use graphite rods to press into the bottom of ...

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Abstract

The invention discloses a short-process preparation method of a high-toughness aluminum-lithium alloy sheet, and belongs to the field of aluminum-lithium alloy rolling forming and deformation heat treatment. According to the method, a 2197 aluminum-lithium alloy cast ingot is prepared through smelting by adopting flux and argon protection and a common gravity casting method, and the high-strength and high-toughness sheet with the thickness of 1-1.5 mm is formed through three-pass rolling (the total rolling reduction is 75%) by adopting deformation, deep cooling and heat treatment regulation and control methods. According to the method, short-process preparation of small-pass and large-rolling-reduction rolling forming and structure property regulation and control is directly carried out on the aluminum-lithium alloy cast ingot, the technical problems that the aluminum-lithium alloy is poor in plasticity and toughness, serious in anisotropy, insufficient in strength and difficult in sheet forming are solved, and the defects that a conventional aluminum-lithium alloy plate thermal mechanical treatment is complex in process, long in production process, low in yield and high in manufacturing cost are overcome.

Description

technical field [0001] The invention relates to the fields of rolling forming and deformation heat treatment of aluminum-lithium alloys, in particular to a short-process preparation method of high-strength and toughness aluminum-lithium alloy thin plates. Background technique [0002] Aluminum-lithium alloys have the advantages of low density, high elastic modulus, high specific strength and specific stiffness, fatigue resistance, and corrosion resistance. Replacing conventional aluminum alloys with aluminum-lithium alloys can reduce the structural mass by 10% to 15%, and increase the rigidity by 15% to 20%. It is an ideal aerospace structural material. However, Al-Li alloys with high Li content have problems such as crystallographic texture, anisotropy of mechanical properties caused by coplanar sliding of precipitated phases, low short transverse toughness and fracture toughness, poor formability, and insufficient strength, which greatly limit their development. It is wid...

Claims

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Application Information

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IPC IPC(8): C22C21/16C22C1/03C22F1/057C21D9/00B21B1/22B21B3/00
CPCC22C21/16C22C1/026C22C1/03C22F1/002C22F1/057C21D9/0081B21B1/22B21B3/00B21B2001/225B21B2003/001
Inventor 边丽萍冀宏亮刘洋峰王涛梁伟赵兴国刘先文
Owner TAIYUAN UNIV OF TECH
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