Influence of Si,Ca addition on elevated temperature properties of AZ91 magnesium alloy
The effect of Si,Ca addition on microstructures and elevated temperature (150℃) properties of as cast magnesium alloys were investigated. The results show that the microstructures of as cast alloys with addition of Si,Ca are refined and a kind of new phase,Mg2Si,is formed 0.24% Si and 0.081% Ca was added to refine Mg2Si. The Si,Ca elements can improve the elevated temperature me chanical properties of the investigated alloys. The ultimate tensile strength and elongation at 150℃ of AZ91-0.24Si alloys were 102 MPa,that has increased 40% than AZ91. After the addition of 0.081% Ca,the ultimate tensile strength and elongation at 150℃ were in creased to 117.7 MPa and 2.1% ,respectively. The high temperature creep resistant properties(150℃,50 MPa,100 h) of alloy was evidently improved by added Si,Ca elements. The improvement of elevated temperature mechanical properties are as a result of the crys tal boundary strength of the Mg2Si phase functionary.
magnesium alloy AZ91 Si Ca elevated temperature properties
QI Wenjun ZHENG Feiyan WANG Shuncheng
Guangzhou Research Institute of Non-Ferrous Metals,Guangzhou 510651,China
国际会议
The 10th China-Russia System on Advanced Materials and Technologies(第十届中俄新材料新工艺研讨会)
浙江嘉兴
英文
306-309
2009-10-20（万方平台首次上网日期，不代表论文的发表时间）