Mg_(97)Ni_1Gd_1Nd_1合金的铸态组织及力学性能  

Microstructure and Mechanical Properties of As-cast Mg_(97)Ni_1Gd_1Nd_1 Alloy with Long Period Stacking Ordered Phase

作　　者：袁柯[1] 尹健[1] 戴斌煜[1] 

机构地区：[1]南昌航空大学航空制造工程学院

出　　处：《特种铸造及有色合金》2016年第1期83-86,共4页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(51101084);江西省自然科学基金资助项目(20151BAB216002)

摘　　要：采用金属型铸造制备了Mg_(97)Ni_1Gd_1Nd_1(摩尔分数)合金,并采用光学显微镜、X射线衍射仪(XRD)、扫描电镜(SEM)和力学试验等研究了合金的铸态组织和力学性能。结果表明,Mg_(97)Ni_1Gd_1Nd_1合金铸态组织主要由树枝状α-Mg和分布于枝晶间的长周期结构相组成;合金室温和300℃时的屈服强度、抗拉强度和伸长率分别为139 MPa、163 MPa、1.7%和131 MPa、192 MPa、6.7%,而300℃抗拉强度优于室温,呈现力学性能温度反常现象;合金室温压缩屈服强度、抗压强度和压缩塑性分别为159 MPa、364 MPa和14.9%,其压缩屈服强度高于拉伸强度,表现出室温屈服拉压不对称性。The microstructure and mechanical properties of as-cast Mg_97Ni_1Gd_1Nd_1 alloy were investigated using optical microscope（OM）,X-ray diffraction（XRD）,scanning electron microscope（SEM）and mechanical tests.The microstructure of as-cast Mg_（97）Ni_1Gd_1Nd_1 alloy is mainly composed ofα-Mg dendrites and interdendritic long period stacking ordered（LPSO）phases.The tensile yield strength,ultimate strength and elongation of the alloy reach 139 MPa,163 MPa and 1.7%,and 131 MPa,192 MPa and6.7%,at room temperature and at 300℃,respectively,showing an anomalous positive temperature dependence of the strength.The compressive yield strength,ultimate strength and plasticity of the alloy reach 159 MPa,364MPa and 14.9%,respectively,at room temperature,indicating a tension-compression asymmetry for as-cast Mg_97Ni_1Gd_1Nd_1 alloy.

关 键 词：镁合金 Mg-Ni-Gd-Nd LPSO相 

分 类 号：TG146.22[一般工业技术—材料科学与工程] TG113.12[金属学及工艺—金属材料]