Method for preparing isotropic high-strength wrought magnesium alloy

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 ...

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.

Images