Effects of Rare Earth Er on Microstructure and Propeties of In-situ Mg<sub>2</sub>Si/AZ91 Composites

Cui Ce; Yao Junping; Zhang Lei; Sun Zhong

doi:10.15980/j.tzzz.2017.11.022

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Effects of Rare Earth Er on Microstructure and Propeties of In-situ Mg₂Si/AZ91 Composites
Vol. 37, Issue 11, Pages: 1238-1241(2017)
Published： 2017 ，
DOI： 10.15980/j.tzzz.2017.11.022

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[1]崔策,尧军平,张磊,孙众.Er对原位自生Mg_2Si/AZ91复合材料组织和性能影响[J].特种铸造及有色合金,2017,37(11):1238-1241.

Cui Ce, Yao Junping, Zhang Lei, et al. Effects of Rare Earth Er on Microstructure and Propeties of In-situ Mg₂Si/AZ91 Composites. [J]. Special Casting & Nonferrous Alloys 37(11):1238-1241(2017)
[1]崔策,尧军平,张磊,孙众.Er对原位自生Mg_2Si/AZ91复合材料组织和性能影响[J].特种铸造及有色合金,2017,37(11):1238-1241. DOI： 10.15980/j.tzzz.2017.11.022.

Cui Ce, Yao Junping, Zhang Lei, et al. Effects of Rare Earth Er on Microstructure and Propeties of In-situ Mg₂Si/AZ91 Composites. [J]. Special Casting & Nonferrous Alloys 37(11):1238-1241(2017) DOI： 10.15980/j.tzzz.2017.11.022.

摘要

研究了不同含量稀土Er对原位自生Mg

Si/AZ91复合材料组织和性能的影响

并讨论其变质机理。结果表明

适量的Er能有效细化原位自生Mg

Si/AZ91复合材料基体的晶粒尺寸

同时改变初生Mg

Si相在基体中的大小、形貌和分布。当Er加入量为0.5%

基体组织细化效果最为显著

其晶粒由250μm细化至180μm

初生Mg

Si相由粗大汉字状转变为短棒状

大小由50μm缩减至20μm

合金的抗拉强度和伸长率也分别由168MPa和1.8%提升至190MPa和2.7%。

Abstract

Influence of varied rare earth Er content on microstructure and properties of the in situ Mg

Si/AZ91 composites was investigated

and its modification mechanism was described.The results reveal that the proper amount of Er can refine effectively the matrix grain size and change the size

morphology and distribution of the reinforcing particles Mg

Si phase in the matrix.With 0.5% Er addition

matrix grain size is refined from 250μm to 180μm

and primary Mg

Si phase is transformed from coarse Chinese script into short rod structure with decrease of size from 50μm to 20μm.Meanwhile

the tensile strength and elongation of the alloy are increased from 168 MPa and 1.8% to 190 MPa and 2.7%

respectively.