Microstructure and mechanical properties of AZ91 magnesium alloy with minor additions of Sm, Si and Ca elements

论文摘要

The effects of Sm, Si and Ca on the microstructure and mechanical property of AZ91 magnesium alloy were investigated by means of optical microscopy（OM）, differential scanning calorimetry（DSC）, scanning electronic microscopy（SEM）, X-ray diffraction（XRD） and tensile testing. The results indicated that the addition of 1.5 wt.% Sm with or without 0.8 Si/Ca led to a decrease in the volume fraction of the β-Mg17 Al12 phase and the formation of the intermetallic compounds of Al-Sm, Mg2 Si, Mg Al Ca and Al2 Ca. The microstructure of AZ91 alloy was significantly refined and distribution became discrete with additions of Sm and Ca; the average grain size of the α-Mg matrix was reduced from 239.7 ± 16.9 μm to 66.34 ± 5.10 μm. The AZ91-Sm-Ca alloy exhibited a good combination of yield strength at 135 MPa, ultimate tensile strength at 199 MPa and elongation at 4.32%, which was ascribed to grain refinement strengthening. Furthermore, the T6 treated AZ91-Sm-Ca alloy possessed yield strength of 154 MPa and elongation of 7.1%, which was due to grain refinement strengthening and reduction in discontinuous precipitates.

论文目录

1 Experimental procedures

2 Results and discussion

2.1 Microstructure of as-cast alloys

2.2 Microstructures of solid solution alloys

2.3 Microstructures of aged alloys

2.4 Tensile properties

3 Conclusions

文章来源

类型: 期刊论文

作者: Redeemina Comfort Bonnah,Yu Fu,Hai Hao

来源: China Foundry 2019年05期

年度: 2019

分类: 工程科技Ⅰ辑

专业: 金属学及金属工艺

单位: Key Laboratory of Solidification Control and Digital Preparation Technology, School of Materials Science and Engineering, Dalian University of Technology

基金: financially supported by the National Key Research and Development Program of China(2016YFB0701204)

分类号: TG146.22

页码: 319-325

总页数: 7

文件大小: 3231K

下载量: 22

Microstructure and mechanical properties of AZ91 magnesium alloy with minor additions of Sm, Si and Ca elements

论文摘要

论文目录

文章来源

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