Microstructure and mechanical properties of extruded Mg-6.5Gd-1.3Nd-0.7Y-0.3Zn alloy

查看全文 作　　者：[1,2]侯秀丽;[1]曹占义;[2]张蕾蕾;[2]房大庆;[3]徐世伟;[3]S.KAMADO;[2]王立民 机构地区：[1]Key Laboratory of Automobile Materials,Ministry of Education,Jilin University;[2]State Key Laboratory of Rare Earth Resource Utilization,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences;[3]Department of Mechanical Engineering,Nagaoka University of Technology 出　　处：《Transactions of Nonferrous Metals Society of China》索引2010年第20卷第B07期,共5页 基　　金：Projects(2006BA104B04-1,2006BAE04B07-3)supported by the National Science and Technology Supporting Program of China;Project(2007KZ05)supported by the Science and Technology Supporting Project of Changchun City,China;Project supported by the Open Subject of State Key Laboratory of Rare Earth Resource Utilization(2008);the'985 Project'of Jilin University,China 摘　　要：The Mg-6.5Gd-1.3Nd-0.7Y-0.3Zn alloy ingot and sheet were prepared by casting and hot extrusion techniques,and the microstructure,age hardening behavior and mechanical properties were investigated.The results show that the as-cast alloy mainly containsα-Mg solid solution and compounds of Mg5RE and Mg24RE5(RE=Gd,Y and Nd)phases.The grain size is refined after hot extrusion,and the Mg5RE and Mg24RE5 compounds are broken during the extrusion process.The extruded alloy exhibits remarkable age hardening response and excellent mechanical properties in the peak-aging state.The ultimate tensile strength,yield strength and elongation are 310 MPa,201 MPa and 5.8%at room temperature,and 173 MPa,133 MPa and 25.0%at 300℃,respectively. 关 键 词：力学性能 挤压铸造 显微组织 合金锭 镁 时效硬化 铸态合金 晶粒尺寸