Effects of Sr Addition on Microstructure and Mechanical Properties of As-cast Mg-5.5Zn-1.2Y-0.6Zr Alloys

Cui Hongwei; Zhang Tiantian; Jia Qiurong; Cui Xiaoli; Chen Hongmei; Yu Hui; Zhai Shenbao; Chai Shaochun

doi:10.15980/j.tzzz.2017.11.002

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Effects of Sr Addition on Microstructure and Mechanical Properties of As-cast Mg-5.5Zn-1.2Y-0.6Zr Alloys
Vol. 37, Issue 11, Pages: 1165-1170(2017)
Published： 2017 ，
DOI： 10.15980/j.tzzz.2017.11.002

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[1]崔红卫,张甜甜,贾秋荣,崔晓丽,陈洪美,余晖,翟慎宝,柴韶春.Sr添加对Mg-5.5Zn-1.2Y-0.6Zr镁合金组织和力学性能的影响[J].特种铸造及有色合金,2017,37(11):1165-1170.

Cui Hongwei, Zhang Tiantian, Jia Qiurong, et al. Effects of Sr Addition on Microstructure and Mechanical Properties of As-cast Mg-5.5Zn-1.2Y-0.6Zr Alloys. [J]. Special Casting & Nonferrous Alloys 37(11):1165-1170(2017)
[1]崔红卫,张甜甜,贾秋荣,崔晓丽,陈洪美,余晖,翟慎宝,柴韶春.Sr添加对Mg-5.5Zn-1.2Y-0.6Zr镁合金组织和力学性能的影响[J].特种铸造及有色合金,2017,37(11):1165-1170. DOI： 10.15980/j.tzzz.2017.11.002.

Cui Hongwei, Zhang Tiantian, Jia Qiurong, et al. Effects of Sr Addition on Microstructure and Mechanical Properties of As-cast Mg-5.5Zn-1.2Y-0.6Zr Alloys. [J]. Special Casting & Nonferrous Alloys 37(11):1165-1170(2017) DOI： 10.15980/j.tzzz.2017.11.002.

摘要

基于改善稀土镁合金性能的目的

利用XRD、OM、FESEM、EDS、万能拉伸试验机等检测手段

研究了不同Sr加入量对Mg-5.5Zn-1.2Y-0.6Zr（ZWK611）合金的微观组织和力学性能的影响。结果表明

铸态ZWK611合金中添加微量Sr（0.08%）

晶粒得到明显细化

第二相数量显著增多

合金的抗拉强度和伸长率比未添加Sr的合金分别提高了10.1%和21.8%

达到246.1 MPa和14.5%。但随着Sr加入量进一步增加

合金的力学性能反而下降

其主要原因是晶粒粗化、第二相强化作用弱化以及W相增多。

Abstract

The effects of Sr addition on the microstructural evolution and mechanical properties of Mg-5.5 Zn-1.2 Y-0.6 Zr（ZWK611）alloys were investigated systematically using XRD

FESEM

EDS and tensile tests.The results reveal that trace addition of Sr（0.08%）can refine grain size in the ZWK611 with the increase of second particles

so tensile strength and elongation of the alloy reach 246.1 MPa and14.5%

compared with those of alloy without Sr addition

increased by 10.1%and 21.8%

respectively.However

with further increasing in Sr addition

mechanical properties of the ZWK611 are decreased

which may be attributed to the combined effects of grain coarsening and decrease of the second phases strengthening as well as more W phases generation.