Preparation and thixoforging of semisolid billet of AZ80 magnesium alloy  

作　　者：姜巨福 王迎 曲建俊 杜之明 罗守靖 

机构地区：[1]School of Materials Science and Engineering,Harbin Institute of Technology [2]Postdoctoral Mobile Station of Mechanical Engineering,Harbin Institute of Technology [3]School of Mechatronics Engineering,Harbin Institute of Technology [4]Postdoctoral Mobile Station of Mechanics,Harbin Institute of Technology

出　　处：《Transactions of Nonferrous Metals Society of China》2010年第9期1731-1736,共6页中国有色金属学报（英文版）

基　　金：Project(50605015) supported by the National Natural Science Foundation of China;Project(HITQNJS.2008.012) supported by Development Program for Outstanding Young Teachers in Harbin Institute of Technology,China;Projects(20090460884,20080440849) supported by China Postdoctoral Science Foundation;Project(LBH-Q08104) supported by the Postdoctoral Foundation of Heilongjiang Province,China

摘　　要：Semisolid billet of AZ80 magnesium alloy was prepared by new strain induced melt activated (new SIMA) process and thixoforging experiment was performed.The results show that after as-cast AZ80 magnesium alloy is processed by equal channel angular extrusion, microstructure is refined well due to heavy dynamic recrystallization occurring in severe plastic deformation.Compared with semisolid isothermal treatment and conventional SIMA, semisolid billet with fine and spheroidal grains are achieved in new SIMA.Thixoforging process of semisolid billet prepared by new SIMA has many advantages such as good surface quality of final component, high ability to fill cavity and net-shape.The fine and spheroidal grains and high mechanical properties such as tensile strength of 298 MPa and elongation of 28% can be developed in final part thixoforged.Semisolid billet of AZ80 magnesium alloy was prepared by new strain induced melt activated （new SIMA） process and thixoforging experiment was performed. The results show that after as-cast AZ80 magnesium alloy is processed by equal channel angular extrusion, microstructure is refined well due to heavy dynamic recrystallization occurring in severe plastic deformation. Compared with semisolid isothermal treatment and conventional SIMA, semisolid billet with fine and spheroidal grains are achieved in new SIMA. Thixoforging process of semisolid billet prepared by new SIMA has many advantages such as good surface quality of final component, high ability to fill cavity and net-shape. The fine and spheroidal grains and high mechanical properties such as tensile strength of 298 MPa and elongation of 28% can be developed in final part thixoforged.

关 键 词：AZ80 magnesium alloy semi-solid forming THIXOFORGING semisolid billet strain induced melt activation 

分 类 号：TG249.9[金属学及工艺—铸造]