Microstructure and Mechanical Properties of Mg-Gd-Ag-Zr Alloys

Zhao Zheng1; Wang Qudong1; Ding Wenjiang1

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Microstructure and Mechanical Properties of Mg-Gd-Ag-Zr Alloys
Vol. 29, Issue 5, Pages: 477-479(2009)
Published： 2009 ，
DOI：

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[1]赵政,王渠东,丁文江.Mg-Gd-Ag-Zr合金的组织与力学性能[J].特种铸造及有色合金,2009,29(05):477-479+391-392.

Zhao Zheng1, Wang Qudong1, Ding Wenjiang1. Microstructure and Mechanical Properties of Mg-Gd-Ag-Zr Alloys. [J]. Special Casting & Nonferrous Alloys 29(5):477-479(2009)
[1]赵政,王渠东,丁文江.Mg-Gd-Ag-Zr合金的组织与力学性能[J].特种铸造及有色合金,2009,29(05):477-479+391-392. DOI：

Zhao Zheng1, Wang Qudong1, Ding Wenjiang1. Microstructure and Mechanical Properties of Mg-Gd-Ag-Zr Alloys. [J]. Special Casting & Nonferrous Alloys 29(5):477-479(2009) DOI：

摘要

对Mg-18.6Gd-1.9Ag-0.24Zr合金铸态、T4态和T6态的显微组织和力学性能进行了研究。结果表明

该合金铸态时由α-Mg与分布在晶界的Mg5Gd相组成;T4态时由过饱和α-Mg固溶体和H2Gd相组成;峰值时效态的析出相为β′相。该合金具有明显的时效强化效果

在200、225、250℃温度下的时效处理结果发现

随着时效温度的升高

合金的峰值时效硬度下降

到达峰值硬度的时间大为缩短。其中200℃下的峰值时效硬度（HV）最高

达到了134。合金经过200℃的峰值时效处理后具有最高的室温力学性能

屈服强度、抗拉强度和伸长率分别为291.0MPa、383.5MPa和1.17%。

Abstract

Microstructure and mechanical properties of Mg-18.6Gd-1.9Ag-0.24Zr alloy in as-cast

T4 and T6 conditions were investigated by OM（optical microscope）and SEM（scanning electron microscope）.The results indicate that microstructure of the as-cast alloy consists of approximately α-Mg equiaxed dendrite and Mg5Gd phase distributed along grain boundary

and it is composed of supersaturated α-Mg phase and H2Gd phase in T4 solution treatment condition

and precipitated β’ phase in peak-aged alloy can be observed.Effects of different aged temperatures

such as 200

225

250 ℃

on hardness of the alloy were investigated.The results show that with increasing in aging temperature

peak-aged hardness of the alloy is decreased

and peak-aged time is shortened greatly

exhibiting distinctly aging strengthening effects

in which maximum peak-aged hardness of HV134 can be obtained at 200 ℃.The yield strength

tensile strength and elongation of the peak-aged treated alloy at 200 ℃ reach 291.0 MPa

383.5 MPa and 1.17%