Effect of Heat Treatment on Microstructure and Hardness of Mg-7Al-1Si-1Gd Alloy

Liu Jian; Wang Wuxiao; Zhang Sha; Zhang Dongjie

doi:10.15980/j.tzzz.2015.07.001

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Effect of Heat Treatment on Microstructure and Hardness of Mg-7Al-1Si-1Gd Alloy
Vol. 35, Issue 7, Pages: 673-676(2015)
Published： 2015 ，
DOI： 10.15980/j.tzzz.2015.07.001

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[1]刘健,王武孝,张莎,张东杰.热处理对Mg-7Al-1Si-1Gd合金组织及硬度的影响[J].特种铸造及有色合金,2015,35(07):673-676.

Liu Jian, Wang Wuxiao, Zhang Sha, et al. Effect of Heat Treatment on Microstructure and Hardness of Mg-7Al-1Si-1Gd Alloy. [J]. Special Casting & Nonferrous Alloys 35(7):673-676(2015)
[1]刘健,王武孝,张莎,张东杰.热处理对Mg-7Al-1Si-1Gd合金组织及硬度的影响[J].特种铸造及有色合金,2015,35(07):673-676. DOI： 10.15980/j.tzzz.2015.07.001.

Liu Jian, Wang Wuxiao, Zhang Sha, et al. Effect of Heat Treatment on Microstructure and Hardness of Mg-7Al-1Si-1Gd Alloy. [J]. Special Casting & Nonferrous Alloys 35(7):673-676(2015) DOI： 10.15980/j.tzzz.2015.07.001.

摘要

在不同的T4和T6热处理条件下

对Mg-7Al-1Si-1Gd合金的组织和硬度进行了研究。结果表明

T4（400℃×12h）固溶处理后β-Mg17Al12相几乎全部溶入α-Mg基体中

但Al2Gd相和汉字状Mg2Si相形貌几乎没有发生变化

因而合金的硬度变化很小。经400℃×12h+200℃×10h的T6处理后

β-Mg17Al12相沿晶界沉淀析出

呈层片状不连续分布

Mg2Si相由粗大汉字状变为细小的块状或棒状

合金硬度达到峰值

较铸态提高了12.45%。

Abstract

The microstructure evolution and hardness of Mg-7Al-1Si-1Gd alloys at different heat treatment conditions（T4and T6treatment）were investigated.The results show that after solution treatment（400 ℃×12h）

β-Mg17Al12 phase is dissolved mostly intoα-Mg

while Al2 Gd and coarse Chinese script Mg2 Si phases have little change

as a result

the increase of hardness can be ignored.After aging treatment（200 ℃ ×10h）

discontinuous lamellarβ-Mg17Al12 phase is precipitated out along grain boundaries

and Mg2 Si phases are evolved into small block-shaped or rod-like phases

and a peak hardness can be observed

which is increased by 12.45% compared with that of as-cast ones.