Mg-12Gd-5Y-1Sm-0.5Zr合金的显微组织和力学性能  

Microstructure and mechanical properties of Mg-12Gd-5Y-1Sm-0. 5Zr alloy

作　　者：陈志[1] 李全安[1] 刘文建[1] 宋晓杰[1] 

机构地区：[1]河南科技大学材料科学与工程学院,河南洛阳471023

出　　处：《金属热处理》2013年第9期71-74,共4页Heat Treatment of Metals

基　　金：国家自然科学基金(51171059);河南省基础与前沿技术研究计划项目(102300410018);河南省高校科技创新团队支持计划(2012IRTSTHN008)

摘　　要：利用X射线衍射仪、光学显微镜、扫描电镜和精密万能电子拉伸试验机对铸态、时效态高强耐热Mg-12Gd-5Y-1Sm-0.5Zr(wt%)合金的显微组织和力学性能进行了研究。结果表明,合金的铸态组织主要由α-Mg固溶体和沿晶界分布的树枝状的第二相组成,经固溶时效处理后,晶界隐约可见,沿晶界仍有部分第二相析出,晶内有弥散分布的析出相产生。时效态合金的室温(25℃)和高温(200、250和300℃)抗拉强度先升高后降低,在250℃达到最大值243 MPa。Mierostructures and mechanical properties of Mg-12Gd-SY-1Sm-0.5Zr （w t% ） alloy were investigated by XRD, OM, SEM and electronic universal tensile tester. The results show that the microstructures of as-cast Mg-12Gd-5Y-1Sm-0.5Zr （wt%） alloy consist of ct-Mg solid solution and the second phase which distributes around grain boundary. After solution and aging treatment, the grain boundary of alloy becomes visible and any precipitated phase still distributes around grain boundary, a little precipitated phase dispersive distributes within the grain. The tensile strength of aged alloy increases at first, and then decreases at room and elevated temperature（200,250 and 300 ℃ ）, and reaches the maximum value 243 MPa at 250 ℃.

关 键 词：Mg-12Gd-5Y-1Sm-0 5ZR合金 显微组织 力学性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]