Preparation method of fine crystalline superplastic heat-resistance magnesium alloy

A magnesium alloy and superplastic technology, applied in the field of metal materials, can solve the problems of unsatisfactory improvement of the particle distribution of the second phase, increased preparation costs, complicated processing procedures, etc., achieve broad industrial application prospects, refine matrix grains, The effect of increasing the rate of superplastic molding

Inactive Publication Date: 2010-06-30
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

However, these compounds are coarse in size and unevenly distributed in the as-cast state. Therefore, to obtain superplasticity, it is necessary not only to refine the grains, but also to break the coarse heat-resistant phase and make it uniformly distributed or dissolved into the matrix.
Although traditional thermal processing (extrusion and rolling) and strong plastic deformation processes (equal channel angular extrusion and high-pressure torsion) can effectively refine the grains, the effect on improving the particle distribution of the second phase is not ideal, especially the processing procedure Complicated, increasing the preparation cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Using a 6 mm thick Mg-6Zn-1Y-0.5Zr extruded sheet for friction stir processing, a grain size of 5 μm, a W phase ( Mg 3 Zn 3 Y 2 ) fine-grained structure with fine particles and uniform distribution. The superplastic tensile test shows that good superplastic properties are obtained in the temperature range of 400-450°C, and at 450°C, 3×10 -3 the s -1 A maximum superplasticity of 640% was achieved at a higher strain rate.

Embodiment 2

[0013] Using a 6 mm thick Mg-10Gd-3Y-0.5Zr as-cast plate for friction stir processing, a uniform fine-grained structure with a grain size of 4.5 microns was obtained under the parameters of tool speed 800 rpm and travel speed 100 mm / min . The superplastic tensile test shows that good superplastic properties are obtained in the temperature range of 400-450°C, and at 425°C and 3×10 -3 the s -1 A maximum superplasticity of 550% was achieved at a higher strain rate.

Embodiment 3

[0017] Friction stir machining was performed using 6 mm thick Mg-4Zn-0.7Y cast sheet to obtain a grain size of 4 μm, phase I (Mg 3 Zn 6 Y) A fine-grained structure with fine particles and uniform distribution. The superplastic tensile test shows that at 350°C, 3×10 -3 the s -1 A maximum superplasticity of 650% is achieved at a higher strain rate.

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Abstract

The invention relates to a preparation method of fine crystalline superplastic heat-resistance magnesium alloy, which is characterized by comprising the following steps of: processing heat-resistance magnesium alloy containing a bulky second phase with uneven distribution by adopting a stirring friction processing technique, thinning the crystal grains of a magnesium matrix, crushing a heat-resistance phase and enabling the heat-resistance phase to be evenly distributed in the matrix so as to form a fine crystalline superplastic structure.

Description

technical field [0001] The invention relates to metal materials, and in particular provides a method for preparing a fine-grain superplastic heat-resistant magnesium alloy, which is suitable for processing heat-resistant magnesium alloys containing coarse and unevenly distributed second phases. Background technique [0002] Superplasticity is a phenomenon in which the plasticity of a material increases significantly at a specific temperature and strain rate. For materials with poor plasticity, superplasticity is a very important molding process for overall industrial parts, and it is widely used in industrial fields such as automobiles and aviation. . Magnesium alloy has a close-packed hexagonal structure, which has low plasticity and poor formability, so superplastic forming is very important for magnesium alloys. There are two main prerequisites for obtaining structural superplasticity. The first is that the grain size is generally less than 10 microns. The second is that...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/06
Inventor 马宗义肖伯律谢广明
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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