Effects of Y Content on Microstructure and Mechanical Properties of Mg-4Sm-0.6Zn-0.5Zr Alloy

Mao Hongkui; Bai Xiaoyu; Tian Yiqing; Yin Zhi; Wang Yu; Xu Hong; Sun Pengcheng; Ge Yingchun

doi:10.15980/j.tzzz.2022.02.013

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Effects of Y Content on Microstructure and Mechanical Properties of Mg-4Sm-0.6Zn-0.5Zr Alloy
Vol. 42, Issue 2, Pages: 194-199(2022)
Published： 2022 ，
DOI： 10.15980/j.tzzz.2022.02.013

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Mao Hongkui, Bai Xiaoyu, Tian Yiqing, et al. Effects of Y Content on Microstructure and Mechanical Properties of Mg-4Sm-0.6Zn-0.5Zr Alloy. [J]. Special Casting & Nonferrous Alloys 42(2):194-199(2022)
DOI：

Mao Hongkui, Bai Xiaoyu, Tian Yiqing, et al. Effects of Y Content on Microstructure and Mechanical Properties of Mg-4Sm-0.6Zn-0.5Zr Alloy. [J]. Special Casting & Nonferrous Alloys 42(2):194-199(2022) DOI： 10.15980/j.tzzz.2022.02.013.

摘要

研究了Y元素对Mg-4Sm-0.6Zn-0.5Zr合金组织及力学性能的影响。结果发现，Mg-4Sm-0.6Zn-0.5Zr合金主要由α-Mg基体、Mg

相、（Mg

Zn）

（Y

Sm）相、LPSO结构的Mg

YZn相组成。随着Y含量增加，晶粒逐渐细化，晶界共晶相数量增多，在晶界位置存在共晶次生LPSO相Mg

YZn。LPSO相与α-Mg基体共格，提高了镁合金的强度和硬度。随着Y含量增加，Mg-4Sm-0.6Zn-0.5Zr合金的力学性能不断提高，Y含量达到6.89%时，铸态Mg-4Sm-7Y-0.6Zn-0.5Zr合金的硬度（HV）、屈服强度、抗拉强度以及伸长率分别为95.6、118 MPa、193 MPa、10.5%。Mg-4Sm-0.6Zn-0.5Zr合金的断口和裂纹深度随着Y含量的增加逐渐变浅，台阶数目减少，由准解理脆性断裂转变为解理脆性断裂。

Abstract

The influences of Y element on the microstructure and mechanical properties of Mg-4 Sm-0.6 Zn-0.5 Zr alloy were investigated. The Mg-4 Sm-xY-0.6 Zn-0.5 Zr alloy is mainly composed of α-Mg matrix

phase

（Mg

Zn）

（Y

Sm） phase

and Mg

YZn phase with LPSO structure. With the increase of Y content

the grains are gradually refined and the amount of eutectic phases at the grain boundary is increased. There exists a eutectic secondary LPSO phase Mg

YZn at the grain boundary. The LPSO phase Mg

YZn is coherent with the α-Mg matrix

which improves the strength and hardness of the magnesium alloy.With the increase of Y content

the mechanical properties of Mg-4 Sm-0.6 Zn-0.5 Zr alloy is improved continously. With the Y content of 6.89%

the hardness

yield strength

tensile strength and elongation of the as-cast Mg-4 Sm-7 Y-0.6 Zn-0.5 Zr alloy reach up to 95.6 HV

118 MPa

193 MPa

10.5%

respectively. The structure of LPSO has an effect on the fracture behavior of magnesium alloy. The fracture mechanism of Mg-4 Sm-7 Y-0.6 Zn-0.5 Zr alloy is characterized by cleavage brittle fracture

and the fracture and crack depth gradually become shallower.