等径角挤压6061铝合金半固态等温压缩变形行为  

Semi-solid Isothermal Compression Behavior of ECAE-Formed 6061 Aluminum Alloy

作　　者：高虎[1] 闫冬[1] 纪兴华[2,3] 孙召瑞[2] 陈刚[3] 

机构地区：[1]枣庄科技职业学院机械工程系 [2]莱芜职业技术学院,莱芜市粉末冶金先进制造重点实验室 [3]哈尔滨工业大学材料科学与工程学院

出　　处：《特种铸造及有色合金》2014年第7期710-712,共3页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(51175018);莱芜市高新区创新发展资助项目;校教师科研基金资助项目(201308JC10;201308JX13)

摘　　要：采用Bc路径对6061铝合金进行了4道次等径角挤压，研究了在应变速率为0．05～0．50S-1、等温处理温度为603～629℃条件下的半固态等温压缩特性，分析了变形温度及应变速率对真应力-真应变曲线的影响。结果表明，等温压缩过程中，6061铝合金的流动应力随变形温度的升高而降低，随应变速率的增加而升高；在变形过程中出现固一液偏析现象，变形较大时固一液偏析现象较明显。纪兴华。6061 aluminum alloy was successfully processed by four-pass equal channel angular extrusion （ECAE） through Be routes. Isothermal compression behavior was tested at strain rates ranging from 0.05 to 1 s-1 and deformation temperate at 603～629 ℃. The true stress-strain curves were analyzed and semi-solid isothermal compression mechanism was described. Influences of deformation temperature and strain rate on the curves were analyzed. The results show that during the isothermal compression, solid-liquid separation occurs, and the flow stress of 6061 aluminum alloy is decreased with increasing in deformation temperature and increased with increasing in strain rates.

关 键 词：6061铝合金 等径角挤压 半固态 等温压缩 

分 类 号：TG379[金属学及工艺—金属压力加工]