Microstructure and Properties of Mg-Gd-Y-Zn-Zr Rare Earth Magnesium Alloys

Zhu Jia′nan; Li Zhiqing; Chen Hongmei; Hu Bingzhou

doi:10.15980/j.tzzz.2018.05.030

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Microstructure and Properties of Mg-Gd-Y-Zn-Zr Rare Earth Magnesium Alloys
Vol. 38, Issue 5, Pages: 571-574(2018)
Published： 2018 ，
DOI： 10.15980/j.tzzz.2018.05.030

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[1]朱嘉楠,李志清,陈洪美,胡冰周.Mg-Gd-Y-Zn-Zr稀土镁合金的组织性能[J].特种铸造及有色合金,2018,38(05):571-574.

Zhu Jia′nan, Li Zhiqing, Chen Hongmei, et al. Microstructure and Properties of Mg-Gd-Y-Zn-Zr Rare Earth Magnesium Alloys. [J]. Special Casting & Nonferrous Alloys 38(5):571-574(2018)
[1]朱嘉楠,李志清,陈洪美,胡冰周.Mg-Gd-Y-Zn-Zr稀土镁合金的组织性能[J].特种铸造及有色合金,2018,38(05):571-574. DOI： 10.15980/j.tzzz.2018.05.030.

Zhu Jia′nan, Li Zhiqing, Chen Hongmei, et al. Microstructure and Properties of Mg-Gd-Y-Zn-Zr Rare Earth Magnesium Alloys. [J]. Special Casting & Nonferrous Alloys 38(5):571-574(2018) DOI： 10.15980/j.tzzz.2018.05.030.

摘要

研究了Mg-Gd-Y-Zn-Zr合金中长周期堆垛有序结构（LPSO）对镁合金组织性能的影响。对铸态Mg-6Gd-2xYxZn-0.6Zr（质量分数

%）合金（x值取1、1.5、2、2.5

Y/Zn的质量比为2）进行X射线衍射分析、扫描电镜观察和能谱分析

拉伸试验和阻尼测试。结果表明

随着Y、Zn含量的增加

合金中镁基体减少、第二相增多

合金铸态相组成为Mg基体和Mg10（Gd

Y）Zn相。另外

组织得到细化

抗拉强度明显增加

塑性也有所提高

断裂机理由脆性解理断裂转变为准解理断裂。含有LPSO结构的镁合金的阻尼性能变化不能用单一的G-L理论解释。

Abstract

The effects of LPSO（Long Period Stacking Order）phase on the microstructure and properties of Mg-Gd-Y-Zn-Zr alloys were investigated.Mg-6 Gd-2 xY-xZn-0.6 Zr（x=1、1.5、2、2.5

constant value of Y/Zn）alloy was analyzed by XRD、SEM-EDS、tensile test and damping test.The results show that

with the increase of Y and Zn content

the magnesium matrix phase is decreased while the second phase is increased

and the as-cast alloy phase consists Mg matrix and Mg10（Gd

Y）Zn phase.As a result

the microstructure and ultimate tensile strength of the alloy are improved

and the plasticity is increased slightly.Moreover

the fracture mechanism of the alloy is changed from brittle cleavage fracture to quasi-cleavage fracture.And damping properties of LPSO-containing magnesium alloys could not be explained by single G-L theory.