钐含量对镁合金微观组织和力学性能的影响  

Effect of Samarium Addition on the Microstructure and Mechanical Properties of As-Cast AM60 Magnesium Alloy

作　　者：华群[1] 胡志[1,2] 揭小平[1] 闫洪[1] 饶远生[1] 

机构地区：[1]南昌大学机电工程学院,江西南昌330031 [2]江西省科学院江西省铜钨新材料重点实验室,江西南昌330031

出　　处：《铸造》2013年第10期1003-1006,共4页Foundry

基　　金：国家自然科学基金资助项目(51165032);江西省教育厅资助项目(GJJ11269);江西省高等学校科技创新团队资助项目(00008713);江西省铜钨新材料重点实验室开放基金项目(2011-TW-03);江西省自然科学基金资助项目(20122BAB216017)

摘　　要：借助光学显微镜、扫描电镜和电子万能试验机研究AM90合金中加入钐(Sm)后的显微组织和力学性能,并分析Sm对合金显微组织和力学性能的影响。结果表明:AM90-xSm合金是由α-Mg、β-Mg17Al12和Al2Sm金属间化合物组成。随着Sm含量的增加,β-Mg17Al12相的尺寸减小,AM90-xSm合金的晶粒得到细化。当Sm含量为2.0%时,屈服强度和极限抗拉强度分别达到最大值147 MPa和168 MPa。当Sm含量为1.0%时伸长率达到最大值,进一步增加Sm的含量时合金的伸长率有所降低。The microstructure and mechanical properties of AM90 magnesium alloy with the addition of Sm was investigated by means of OM, SEM and electronic universal testing machine. The results show that the microstructure of the AM60-xSm alloys consists of α-Mg, β-Mg17Al12 phase and A12Sm intermetallic compound. The dimensions of the β-Mg17Al12 phase in the AM60-xSm alloys both decreased with increasing Sm content. The maximum values of the yield strength and the ultimate tensile strength were 147 MPa and 168 MPa, respectively, for the alloy with 2 wt.% Sm. Maximum elongation of AM60-xSm was achieved with 1 wt.% Sm addition. However, the elongation of the as-cast alloys was reduced with further addition of Sm.

关 键 词：镁合金 SM 显微组织 力学性能 

分 类 号：TG146.22[一般工业技术—材料科学与工程]