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Low-cost high-strength high-modulus cast magnesium alloy and preparation method thereof

A technology for casting magnesium alloy, high strength and high modulus, applied in the field of metal material magnesium alloy, can solve the problems of high cost and difficult composition control of high modulus rare earth magnesium alloy, achieve low cost, reduce lattice constant, ensure strength and The effect of toughness

Pending Publication Date: 2022-04-12
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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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 solve the problems of high cost and difficult composition control of existing high modulus rare earth magnesium alloys, and propose a low-cost, high-strength, high-modulus cast magnesium alloy and its preparation method

Method used

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  • Low-cost high-strength high-modulus cast magnesium alloy and preparation method thereof
  • Low-cost high-strength high-modulus cast magnesium alloy and preparation method thereof
  • Low-cost high-strength high-modulus cast magnesium alloy and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0034] This embodiment provides a low-cost high-strength high-modulus cast magnesium alloy, which includes: 8.0% Zn, 7.0% li, 2.0% Al, 0.5% Mn, 0.5%. Cu, impurity element Fe 0.001%, impurity element Ni 0.0005%, and the remaining is Mg, i.e., the cast magnesium alloy is Mg-8Zn-7Li-2Al-0.5Cu-0.5 mn alloy.

[0035] The preparation method of the above MG-8ZN-7LI-2Al-0.5Cu-0.5Mn alloy includes:

[0036]S1: Pure Mg, Mg-20% li intermediate alloy, Mg-10% Mn intermediate alloy, pure Zn, pure Al and pure Cu bake at 150 ° C for 2 h;

[0037] S2: Pure Mg, Mg-20% li intermediate alloy, Mg-10% Mn MN, pure Zn, pure Al and pure Cu, in a vacuum sensitive smelting furnace crucible, and then the vacuum induction The smelting furnace crucible is placed in a vacuum inductive melting furnace. When the furnace is vacuum to the furnace, the vacuum is less than 1 Pa, and the furnace is charged with high purity argon to 0.4 atmospheric pressure, and then raise the vacuum to the furnace. The vacuum is less ...

Embodiment 2

[0046] This embodiment provides a low-cost high-strength high modulus cast magnesium alloy, and the difference from the first embodiment is that Cu is not included in the cast magnesium alloy of the present embodiment, and the total weight of the cast magnesium alloy. The cast magnesium alloy includes: 8.0% Zn, 7.0% li, 2.0% Al, 0.5% Mn, impurity element Fe 0.0009%, impurity element Ni 0.0004%, and the rest is Mg.

Embodiment 3

[0048] This embodiment provides a low-cost high-strength high modulus cast magnesium alloy, which includes: 7.0% Zn, 8.0% li, 4.0% Al, 0.5% Mn, impurity element. FE 0.0008%, the impurity element Ni is 0.0006%, the remaining is Mg, ie the cast magnesium alloy is Mg-7Zn-8Li-4Al-0.5 mn alloy.

[0049] The preparation method of the above Mg-7ZN-8Li-4Al-0.5 mn alloy is only in:

[0050] S4: Rhymes to the refined temperature of 750 ° C for refinement 12min; after the refining treatment is completed, in a metal mold having a diameter of 100 mm at 710 ° C, the alloy ingot is obtained.

[0051] S5: The alloy ingot was first solidified at 360 ° C for 48 h, and was quenched at 90 ° C to room temperature; then at 75 ° C for 4 h, it continued to heat up to 175 ° C for 24 h, air cooling to The MG-7ZN-8LI-4Al-0.5 mn alloy was obtained at room temperature.

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Abstract

The invention belongs to the field of metal material magnesium alloys, and discloses a low-cost high-strength high-modulus cast magnesium alloy and a preparation method thereof. According to the total weight of the cast magnesium alloy, the cast magnesium alloy comprises 3.0%-10.0% of Zn, 2%-10.0% of Li, 1%-6.0% of Al, 0.01%-3.0% of Mn, 0.01%-1.0% of Cu and an impurity element Filt. 0.005%, the impurity element of which is Nilt; 0.002%, and the balance of Mg. According to the preparation method, Zn, Li, Al, Cu, Mn and other rare-earth-free elements are adopted, a novel design method of the double-configuration high-modulus-nanophase reinforced high-strength high-modulus magnesium alloy is utilized, the modulus of the alloy is improved through micron-scale primary high-modulus second phase precipitation separated out of the alloy, a nanoscale secondary precipitation strengthening phase is regulated and controlled through a subsequent heat treatment process, the strength and toughness of the alloy are guaranteed, and the high-strength high-modulus magnesium alloy is obtained. Therefore, cooperative control of low cost, high modulus and high strength and toughness is achieved.

Description

Technical field [0001] The invention belongs to the magnesium alloy field of metal material, and more particularly to a low-cost high-strength high modulus cast magnesium alloy and preparation method. Background technique [0002] The elastic modulus of the magnesium alloy is usually around 40 GPa, which is prone to deformation in the complex service environment, causing the equipment function failure, so the research and development of high-modulus magnesium alloys is of great significance for its lightweight application in the supporting structure. In recent years, research on high-modulus magnesium alloys is increasingly concerned, the focus of research is to ensure that magnesium alloy toughness improves its modulus. Studies have shown that the precipitation phase of high-elastic modulus is conducive to improving the modulus of magnesium alloys, so the key to research and development of high modulus magnesium alloys is to select high modulus and have a good absorption of subs...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/00C22C23/04C22F1/06C21D1/18C22C1/03C22C1/06
Inventor 李应举杨院生罗天骄冯小辉黄秋燕郑策曹天慧
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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