A homogenization deformation heat treatment method for rapid refinement and homogenization of as-cast aluminum-lithium alloy

A deformation heat treatment and homogenization treatment technology, applied in the direction of improving process efficiency, can solve the problems of limited control of component particles and grain growth, and achieve the effect of short treatment time, fine grain size and low temperature

Active Publication Date: 2022-05-17
TAIYUAN UNIV OF TECH
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  • Abstract
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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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  • A homogenization deformation heat treatment method for rapid refinement and homogenization of as-cast aluminum-lithium alloy
  • A homogenization deformation heat treatment method for rapid refinement and homogenization of as-cast aluminum-lithium alloy
  • A homogenization deformation heat treatment method for rapid refinement and homogenization of as-cast aluminum-lithium alloy

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Embodiment 1

[0038] A homogenization deformation heat treatment method for rapid refinement and homogenization of cast aluminum-lithium alloy, 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%, Mn is 0.3% and the balance is aluminum. The proportioning raw materials of pure magnesium block, pure lithium particle, Al-50Cu master alloy, Al-5Zr master alloy, Al-20Mn master alloy and pure aluminum block are weighed.

[0040]Step 2: Smelting: Add pure aluminum block, aluminum-copper master alloy, aluminum-zirconium master alloy, and aluminum-manganese master alloy into the graphite crucible, sprinkle high-purity LiF-LiCl flux with a mass ratio of 1:4 on the surface to cover and Introduce Ar gas protection gas, melt in a well-type resistance furnace at 730°C for 20-30 minutes; remove slag after melting, add pure magnesium and pure lithium wrapped in aluminum foil, and sprinkle covering agent (mass ratio: 1 :4 high-purity L...

Embodiment 2

[0052] A homogenization deformation heat treatment method for rapid refinement and homogenization of cast aluminum-lithium alloy, as follows:

[0053] Step one to step five are the same as embodiment 1.

[0054] Step 6: The plate sample obtained in step 5 is subjected to a first-level homogenization treatment at 540° C. for 1.5 h in a tubular heating furnace, and water quenched after the homogenization treatment to obtain the final plate.

[0055] Microstructure characterization of aluminum-lithium alloy plates, Figure 5 It is the metallographic microstructure image after the homogenization treatment in Example 2, the second phase remains on some grain boundaries, and is distributed continuously or intermittently, and the grain boundaries are thicker than figure 2 And the grain size also increases sharply.

Embodiment 3

[0057] A homogenization deformation heat treatment method for rapid refinement and homogenization of cast aluminum-lithium alloy, as follows:

[0058] Step one to step five are the same as embodiment 1.

[0059] Step 6: The plate sample obtained in Step 5 is subjected to primary homogenization treatment at 350°C×1h in a tubular heating furnace.

[0060] Step 7: Heat the plate obtained in step 6 to the secondary homogenization temperature with the furnace, perform secondary homogenization treatment at 520° C. for 1 hour, and water quench after the secondary homogenization treatment to obtain the final plate.

[0061] Microstructure characterization of aluminum-lithium alloy plates, Image 6 This is the metallographic microstructure image after the homogenization treatment in Example 3, the grain boundaries are relatively clear, the second phase basically dissolves back into the matrix, and the solid solution effect is better, but the grain size is much larger than figure 2 ....

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Abstract

The invention discloses a homogenization deformation heat treatment method for rapid refinement and homogenization of as-cast aluminum-lithium alloy, comprising: step 1, preparing aluminum-lithium alloy ingot: preparing aluminum-lithium alloy ingot by ordinary gravity casting and smelting, and aluminum Lithium alloy ingots are cut into plates; step 2, primary homogenization treatment: heat preservation at the temperature of the primary homogenization treatment; step 3, rolling deformation: after the primary homogenization is completed, the plate is quickly rolled and deformed; Step 4, secondary homogenization treatment: the deformed sample is heated from the primary temperature to the secondary temperature for heat preservation. The invention realizes the rapid preparation method of aluminum-lithium alloy homogenization treatment with short time, low temperature, uniform composition and fine grains, and solves the problem of conventional homogenization treatment process requiring high temperature for long time heat preservation and grain growth and coarsening after homogenization treatment Serious and difficult to control the technical problems of component particles, it has engineering practical value for the preparation and industrial production of high-performance aluminum-lithium alloys.

Description

technical field [0001] The invention belongs to the field of deformation heat treatment of aluminum-lithium alloys, in particular to a homogenization deformation heat treatment method for rapid refinement and homogenization of cast aluminum-lithium alloys. Background technique [0002] Aluminum-lithium alloy has the advantages of low density, high elastic modulus, high specific strength and specific stiffness, fatigue resistance, corrosion resistance, etc., and is widely used in the aerospace industry. 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, short transverse toughness and low fracture toughness, poor formability, and insufficient strength, which greatly limit their applications. Wide application in lightweight field. [0003] The original as-cast microstructure, homogenization heat treatment and subsequent processing of Al-Li alloy determ...

Claims

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Application Information

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Patent Type & Authority Patents(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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