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
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