Mg-RE(Nd,Y)-0.48Zn-0.52Zr合金显微组织及强韧化机理  

Microstructure and Strengthening-toughening Mechanism of Mg-RE(Nd, Y)-0.48Zn-0.52Zr Alloys

作　　者：董丽君[1,2] 夏长清[1] 吴安如[2,3] 高为国[2] 

机构地区：[1]中南大学材料科学与工程学院 [2]湖南工程学院机械工程学院 [3]北京科技大学新金属材料国家重点实验室

出　　处：《特种铸造及有色合金》2009年第10期901-904,共4页Special Casting & Nonferrous Alloys

基　　金：北京科技大学新金属材料国家重点实验室开放基金资助项目(2008Z-2);湖南省教育厅重点资助科研项目(08A010)

摘　　要：采用光学显微镜、扫描电镜及X射线衍射等对Mg-RE(Nd,Y)-0.48Zn-0.52Zr合金组织及相组成进行了分析。对2种合金的挤压态试样进行了室温力学性能及高温力学性能试验,并与T5热处理后进行比较。Mg-Nd-0.48Zn-0.52Zr合金在300℃时的抗拉强度为79.00MPa,Mg-Nd-Y-0.48Zn-0.52Zr合金在330℃时的抗拉强度为202.53MPa,试验结果表明,添加Y对提高合金高温抗拉强度有明显的作用。Microstructure and phase constituent of Mg-RE(Nd, Y)-0.48Zn-0.52Zr alloy were analyzed by OM (optical microscope), SEM (scanning electron microscope) and XRD (X-ray diffraction). Meanwhile, the mechanical properties at room temperature and at high temperature of two kinds of as-extruded samples were tested, and they were compared with those of extrusion +T5 heat treated ones. The results show that tensile strength of Mg-RE(Nd)-0.48Zn-0.52Zr reaches 79MPa at 300℃ while tensile strength of Mg-RE(Y)-0.48Zn-0.52Zr reaches 202.53MPa at 330℃. The Y element plays the obvious role in improving elevated tensile strength of the alloy.

关 键 词：Mg-RE(Nd Y)-0.48Zn-0.52Zr合金 显微组织 高温力学性能 

分 类 号：TG115.21[金属学及工艺—物理冶金]