Microstructure and mechanical properties of extruded Mg-8.5Gd-2.3Y-1.8Ag-0.4Zr alloy  

挤压Mg-8.5Gd-2.3Y-1.8Ag-0.4Zr合金的显微组织与力学性能(英文)

作　　者：周浩[1] 王渠东[1,2] 陈杰[1] 叶兵[1,2] 郭炜[1] 

机构地区：[1]上海交通大学轻合金精密成型国家工程研究中心,上海200240 [2]上海交通大学金属基复合材料国家重点实验室,上海200240

出　　处：《Transactions of Nonferrous Metals Society of China》2012年第8期1891-1895,共5页中国有色金属学报（英文版）

基　　金：Projects (50674067, 51074106) supported by the National Natural Science Foundation of China;Project (2009AA033501) supported by the High-Tech Research and Development Program of China;Project (09JC1408200) supported by the Science and Technology Commission of Shanghai Municipality, China

摘　　要：The microstructure, age hardening behavior and mechanical properties of an Mg-8.5Gd-2.3Y-1.8Ag-0.4Zr alloy prepared by casting and hot extrusion techniques were investigated. The solution-treated （T4 temper） alloys were extruded at 400, 450 and 500 °C with an extrusion ratio of 10：1, respectively. Optimized mechanical properties were obtained by extrusion at 400 °C followed by T5 treatment under the combined effects of grain refinement and precipitation strengthening. The alloy exhibits a grain size of about 5.0 μm, initial and peak microhardness of HV 109 and HV 129, respectively. The tensile yield strength, ultimate tensile strength and elongation at room temperature are 391 MPa, 430 MPa and 5.2%, respectively.研究铸态和挤压态Mg-8.5Gd-2.3Y-1.8Ag-0.4Zr合金的显微组织、时效强化和力学性能。铸锭在T4处理后分别于400、450和500°C进行挤压,挤压比为10:1。在细晶强化和析出强化的共同作用下,于400°C挤压的样品经T5处理后可以得到最优的力学性能,所得的晶粒尺寸约为5.0μm,其初始和峰值硬度分别为HV109和HV129。室温下的拉伸屈服强度、抗拉强度和伸长率分别达到391MPa、430MPa和5.2%。

关 键 词：Mg-Gd-Y-Ag-Zr alloy EXTRUSION age hardening microstructure mechanical property 

分 类 号：TG379[金属学及工艺—金属压力加工]