Microstructures and tensile properties of as-extruded Mg-Sn binary alloys  

作　　者：陈冬 任玉平 郭运 裴文利 赵宏达 秦高梧 

机构地区：[1]Key Laboratory for Anisotropy and Texture of Materials of Ministry of Education,Northeastern University(Shenyang)

出　　处：《Transactions of Nonferrous Metals Society of China》2010年第7期1321-1325,共5页中国有色金属学报（英文版）

基　　金：Project(2008S089)supported by the Key Laboratory Program of Liaoning Province,China;Project(2007010303025)supported by the Shenyang Talents Supporting,China;Project(50731002)supported by the National Natural Science Foundation of China

摘　　要：The microstructure and mechanical properties of Mg-xSn （x-3, 7 and 14, mass fraction, %） alloys extruded indirectly at 300 ℃ were investigated by means of optical microscopy, scanning electron microscopy and tensile test. The grain size of the a-Mg matrix decreases from 220, 160 and 93 μm after the homogenization treatment to 28, 3 and 16 μm in the three alloys after extrusion, respectively. The results show that the grain refinement is most remarkable in the as-extruded Mg-7Sn alloy. At the same time, the amount of the Mg2Sn particles remarkably increases in the Mg-7Sn alloy with very uniform distribution in the a-Mg matrix. In contrast, the Mg2Sn phase inherited from the solidification with a large size is mainly distributed along grain boundary in the Mg-14Sn alloy. The tensile tests at room temperature show that the ultimate tensile strength of the as-extruded Mg-7Sn alloy is the highest, i.e., 255 MPa, increased by 120% as compared with that of as-cast samples.The microstructure and mechanical properties of Mg-xSn(x=3,7 and 14,mass fraction,%) alloys extruded indirectly at 300℃ were investigated by means of optical microscopy,scanning electron microscopy and tensile test.The grain size of theα-Mg matrix decreases from 220,160 and 93μm after the homogenization treatment to 28,3 and 16μm in the three alloys after extrusion,respectively.The results show that the grain refinement is most remarkable in the as-extruded Mg-7Sn alloy.At the same time,the amount of the Mg2Sn particles remarkably increases in the Mg-7Sn alloy with very uniform distribution in theα-Mg matrix.In contrast,the Mg2Sn phase inherited from the solidification with a large size is mainly distributed along grain boundary in the Mg-14Sn alloy.The tensile tests at room temperature show that the ultimate tensile strength of the as-extruded Mg-7Sn alloy is the highest,i.e.,255 MPa,increased by 120%as compared with that of as-cast samples.

关 键 词：Mg-Sn alloy EXTRUSION tensile property MICROSTRUCTURE 

分 类 号：TG379[金属学及工艺—金属压力加工]