Homogenizing deformation heat treatment method for rapidly refining and homogenizing as-cast aluminum-lithium alloy

A technology of deformation heat treatment and homogenization treatment, applied in the direction of improving process efficiency, etc., can solve the problems of grain growth and limited control of component particles, and achieve the effects of short treatment time, low temperature and reasonable design

Active Publication Date: 2022-01-07
TAIYUAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a homogenized deformation heat treatment method that quickly realizes uniform composition and grain refinement of the as-cast aluminum-lithium alloy, so as to solve the problem that the conventional homogenization heat treatment process of aluminum-lithium alloy ingot requires high temperature and long time treatment, and the crystal grain The technical problems of severe growth and limited regulation of component particles

Method used

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  • Homogenizing deformation heat treatment method for rapidly refining and homogenizing as-cast aluminum-lithium alloy
  • Homogenizing deformation heat treatment method for rapidly refining and homogenizing as-cast aluminum-lithium alloy
  • Homogenizing deformation heat treatment method for rapidly refining and homogenizing as-cast aluminum-lithium alloy

Examples

Experimental program
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Effect test

Embodiment 1

[0038] A rapid refinement and homogeneous refrigeration method of homogeneous refrigeration treatment, as follows:

[0039] 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%, and the Mn is 0.3% and the margin is aluminum. Pure magnesium block, pure lithium, Al-50Cu intermediate alloy, Al-5ZR intermediate alloy, Al-20mN intermediate alloy and pure aluminum block ratio feedstock.

[0040]Step 2: Solmetry: Add the pure aluminum block, aluminum copper, aluminum zirconia alloy, and aluminum manganese intermediate alloy, and the aluminum manganese intermediate alloy is added to the graphite crucible, and the mass ratio of 1: 4 is covered with a high-purity ratio of 1: 4. AR gas protection gas, in the well-type resistance furnace, 730 ° C Sollow 20 ~ 30 min; after melting, the slag is made, the pure magnesium and pure lithium wrapped with an aluminum foil are added, and the cover is sprinkled with the cover (mass ratio 1 : 4 high purif...

Embodiment 2

[0052] A rapid refinement and homogeneous refrigeration method of homogeneous refrigeration treatment, as follows:

[0053] Step one to step five as in Example 1.

[0054] Step Six: The sheet sample obtained by the step 5 was subjected to 540 ° C × 1.5H level homogenization treatment in the tube heating furnace, and the homogenization treatment was completed, and the final sheet was obtained.

[0055] Tissue the aluminum lithium alloy sheet, Figure 5 The gold phase microstructure image after homogenization of this Example 2, and the second phase remaining on the partial crystal boundary, which is continuous or intermittent distribution, and the grain boundary is coarse figure 2 And the grain size has grown sharply.

Embodiment 3

[0057] A rapid refinement and homogeneous refrigeration method of homogeneous refrigeration treatment, as follows:

[0058] Step one to step five as in Example 1.

[0059] Step Six: The sheet sample obtained by step 5 was subjected to 350 ° C × 1H 1 homogenization treatment in the tube heating furnace.

[0060] Step 7: The sheet obtained by the step six is ​​warmed to the secondary homogenization temperature, and the 520 ° C × 1H secondary homogenization treatment is performed, and the second-stage homogenization treatment is completed, and the final plate is obtained.

[0061] Tissue the aluminum lithium alloy sheet, Image 6 For this embodiment 3 homogenized gold phase microstructure image, the grain boundary is relatively clear, the second phase is substantially reluctant to the substrate, the solid solution is better, but the grain size is much larger than figure 2 .

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Abstract

The invention discloses a homogenizing deformation heat treatment method for rapidly refining and homogenizing an as-cast aluminum-lithium alloy. The homogenizing deformation heat treatment method for rapidly refining and homogenizing the as-cast aluminum-lithium alloy comprises the following steps of 1, preparing an aluminum-lithium alloy cast ingot: preparing the aluminum-lithium alloy cast ingot through common gravity casting smelting, and cutting the aluminum-lithium alloy cast ingot into a plate; 2, carrying out primary homogenization treatment: carrying out heat preservation at the primary homogenization treatment temperature; 3, carrying out rolling deformation: after primary homogenization is finished, carrying out rolling deformation on the plate rapidly; and 4, carrying out secondary homogenization treatment: raising the temperature of the deformed sample from the primary temperature to a secondary temperature, and carrying out heat preservation. According to the homogenizing deformation heat treatment method for rapidly refining and homogenizing the as-cast aluminum-lithium alloy provided by the invention, the aluminum-lithium alloy is short in homogenization treatment time, low in temperature, uniform in component and fine in grain; the technical problems that a conventional homogenization treatment process needs high-temperature and long-time heat preservation, grain growth and coarsening are serious after homogenization treatment, and component particles are difficult to regulate and control are solved; and the method has an engineering practical value for preparation and industrial production of the high-performance aluminum-lithium alloy.

Description

Technical field [0001] The present invention belongs to the field of the aluminum lithium alloy, and is specifically a homogeneous beam-type heat treatment method for rapid refinement and homogenization of the cast aluminum lithium alloy. Background technique [0002] The aluminum lithium alloy has the advantages of low density, high elastic modulus, high ratio strength and strength, anti-fatigue, corrosion resistance, and is widely used in the aerospace industry. However, high Li content aluminum lithium alloy has a crystallographic texture, and the co-surface slip caused by the co-surface slip, the short-lived toughness, and the cleavage toughness are low, the formability is poor, and the intensity is highly limited. Wide applications in the field of lightweight. [0003] Aluminum alloy cast matrix, uniform heat treatment and subsequent processing jointly determine the microstructure and mechanical properties of the final alloy. The original tissue of the cast aluminum lithium ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/057C22C1/03C22C1/06C22C21/16
CPCC22F1/057C22C21/16C22C1/026C22C1/03C22C1/06Y02P10/20
Inventor 边丽萍冀宏亮王涛梁伟任忠凯陈鹏马晋遥
Owner TAIYUAN UNIV OF TECH
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