Method for preparing isotropic high-strength wrought magnesium alloy

A deformed magnesium alloy, isotropic technology, applied in the field of metallurgy and plastic processing of metal materials, can solve the problems of poor plastic forming ability and plastic processing performance, inconsistent mechanical properties of magnesium alloy components, coarse structure of as-cast magnesium alloy, etc. The effect of increasing strengthening and elongation, eliminating anisotropy of mechanical properties, and increasing strain hardening rate

Active Publication Date: 2016-04-13
威海市哈能新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) Magnesium alloy has a typical close-packed hexagonal crystal structure, low symmetry, few slip systems, and poor plastic forming ability and plastic processing performance at low temperature (<250°C) (elongation is generally lower than 15%) , it is difficult to efficiently manufacture high-performance magnesium alloy products through low-temperature plastic deformation;
[0005] (2) It is easy to introduce strong {0002} basal texture after plastic processing, such as rolled plate texture and extruded wire texture, resulting in inconsistent mechanical properties of magnesium alloy components along all directions
The limitations of casting methods and a series of problems such as coarse structure, poor strength, high brittleness, and difficult plastic processing of as-cast magnesium alloys have greatly restricted the application and promotion of magnesium alloys.

Method used

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  • Method for preparing isotropic high-strength wrought magnesium alloy

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Put 1500g of pure magnesium ingot, 54g of pure zinc, and 36g of Mg-30wt.%Zr master alloy into a vacuum induction melting furnace, melt at 755°C under the protection of high-purity argon and keep it warm for 30min, then add 105g of Mg-30wt.%Y, 84gMg-30wt.%Gd and 21gMg-30wt.%Nd master alloys were kept for 2h, and finally cooled down to 690°C, left to stand for 15min, and poured. The obtained composition is Mg-3.0wt.%Zn-0.6wt.%Zr-3.5wt.%RE, and the total amount of impurity elements is less than 0.02wt.%. After that size); followed by a homogenization treatment at 455°C×24h under an argon protective atmosphere to homogenize the structure and eliminate segregation and solid-solution intergranular phases.

[0062] Turning to remove the oxide skin on the surface of the round ingot, and cut it into a Φ100mm×80mm extrusion test piece. After preheating at 200°C for 0.5h, extrude it into a Φ30mm magnesium alloy bar at one time. The extrusion ratio is 11, and the mold is preheated....

Embodiment 2

[0065] Put 1623g pure magnesium ingot, 99g pure zinc, 48gMg-30wt.% Zr master alloy into a vacuum induction melting furnace, melt at 720°C under the protection of high-purity argon and keep it warm for 25min, then add 24gMg-30wt.%Y and The 6gMg-30wt.%Nd master alloy was kept warm for 0.5h, and finally cooled down to 660°C, left to stand for 10min, and poured. The obtained composition is Mg-5.5wt.%Zn-0.8wt.%Zr-0.5wt.%RE, and the total amount of impurity elements is less than 0.02wt.%. After that size); followed by a homogenization treatment at 410°C×24h under an argon protective atmosphere to homogenize the structure and eliminate segregation and solid-solution intergranular phases.

[0066] Turning to remove the oxide skin on the surface of the round ingot, and cut it into an extrusion test piece of Φ100mm×80mm. After preheating at 100°C for 0.5h, extrude it into a magnesium alloy bar of Φ30mm at one time. The extrusion ratio is 11, and the mold is preheated. The temperature i...

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Abstract

The invention discloses a method for preparing isotropic high-strength wrought magnesium alloy. The method comprises the steps that firstly, magnesium alloy prepared from 3.0-5.5 wt.% of Zn, 0.6-0.8 wt.% of Zr, 0.5-3.5 wt.% of RE, less than 0.02 wt.% of all impurities and the balance Mg is provided, wherein RE is selected from one or more of Y, Gd and Nd; secondly, the magnesium alloy is subjected to low-temperature pre-squeezing, wherein the workpiece squeezing temperature is minus 200 DEG C; thirdly, the magnesium alloy subjected to pre-squeezing is subjected to isothermal reciprocating squeezing, wherein the squeezing temperature ranges from 200 DEG C to 350 DEG C, and the total accumulated dependent variable ranges from 5 to 12; fourthly, the magnesium alloy subjected to isothermal reciprocating squeezing is directly subjected to multi-stage aging treatment, and thus the isotropic high-strength wrought magnesium alloy is obtained.

Description

technical field [0001] The present application generally relates to the field of metallurgy and plastic working of metallic materials. More specifically, the present application relates to methods of making isotropic high strength wrought magnesium alloys. Background technique [0002] Due to the urgent need for energy conservation and environmental protection, structural lightweight is an important goal and direction for the development of many national defense and national economic and industrial fields such as aerospace, automobiles, electronics, and communications. Wrought magnesium alloys show very good application prospects due to their light weight, high strength, excellent electromagnetic shielding and shock resistance. Therefore, it is extremely important to realize the large-scale application of wrought magnesium alloys in the field of lightweight structural parts. and broad application prospects. [0003] However, at present, the mainstream processing method of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/04C22F1/06
CPCC22C23/04C22F1/06
Inventor 张文丛陈文振张立新
Owner 威海市哈能新能源科技有限公司
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