Microstructural evolution of AZ61 magnesium alloy predeformed by ECAE during semisolid isothermal treatment  

等径道角挤压预变形AZ61镁合金在半固态等温处理中的微观组织演变(英文)

作　　者：姜巨福[1,2] 林鑫[2] 王迎[3] 曲建俊[3] 罗守靖[1] 

机构地区：[1]哈尔滨工业大学材料科学与工程学院,哈尔滨150001 [2]西北工业大学凝固技术国家重点实验,西安710072 [3]哈尔滨工业大学机电工程学院,哈尔滨150001

出　　处：《Transactions of Nonferrous Metals Society of China》2012年第3期555-563,共9页中国有色金属学报（英文版）

基　　金：Project(51075099) supported by the National Natural Science Foundation of China;Project(E201038) supported by Natural Science Foundation of the Heilongjiang Province,China;Project(20090460884) supported by the China Postdoctoral Science Foundation; Project(SKLSP201121) supported by the Fund of the State Key Laboratory of Solidification Processing in NWPU,China;Project (2011RFQXG010) supported by the Harbin City Young Scientists Foundation,China;Project(LBH-T1102) supported by the Specially Postdoctoral Science Foundation of Heilongjiang Province,China

摘　　要：The microstructural evolution of AZ61 magnesium alloy predeformed by equal channel angular extrusion（ECAE） during semisolid isothermal treatment（SSIT） was investigated by means of optical metalloscopy and image analysis equipment.The process involved application of ECAE to as-cast alloy at 310 ℃ to induce strain prior to heating in the semisolid region for different time lengths.The results show that extrusion pass,isothermal temperature and processing route have an influence on microstructural evolution of predeformed AZ61 magnesium alloy during SSIT.With the increase of extrusion pass,the solid particle size is reduced gradually.When isothermal temperature increases from 530 ℃ to 560 ℃,the average particle size increases from 22 μm to 35 μm.When isothermal temperature is 575 ℃,the average particle size decreases.The particle size of microstructure of AZ61 magnesium alloy predeformed by ECAE at BC during SSIT is the finest.利用金相显微镜和图像分析设备对等径道角挤压预变形AZ61镁合金在半固态等温处理中的微观组织演变进行研究。先利用等径道角挤压对AZ61镁合金铸坯在310℃进行应变诱导,然后将其在半固态进行不同时间的等温处理。研究结果表明:挤压道次、等温处理温度和变形路径影响预变形AZ61镁合金在半固态等温处理中的微观组织演变过程。在将等温处理温度从530℃升高至560℃的过程中,合金的平均晶粒尺寸从22μm增大到35μm。当等温处理温度为575℃时,平均晶粒尺寸减小。当等径道角挤压的变形路径为BC时,预变形AZ61镁合金在半固态等温处理中获得的微观组织晶粒尺寸最小。

关 键 词：AZ61 magnesium alloy semisolid isothermal treatment equal channel angular extrusion microstructural evolution 

分 类 号：TG379[金属学及工艺—金属压力加工]