等通道转角挤压纯铝的组织结构  

MICROSTRUCTURE OF PURE ALUMINUM WORKED BY EQUAL CHANNEL ANGULAR EXTRUSION

作　　者：赵润娴[1] 张建[1] 王志奇[1] 毕大森[1] 崔宏祥[1] 

机构地区：[1]天津理工学院,天津300191

出　　处：《有色金属》2002年第2期8-11,共4页Nonferrous Metals

基　　金：天津市高校科技发展基金资助项目 (990 3 0 8)

摘　　要：研究等通道转角挤压方法挤压纯铝的组织结构。纯铝试样经过ECAE挤压 ,在通道转角处产生大的剪切塑性变形 ,使晶粒细化。ECAE前原始晶粒尺寸为 2 μm ,一次挤压后晶粒尺寸约为 1 2 μm ,多次挤压后晶粒不断细化 ,8次后尺寸达到0 .3 μm。同时 ,纯铝随挤压道次增加硬度提高 ,但挤压 3～ 4次后硬度趋于饱和。ECAE技术不仅能够控制晶粒尺度 。The microstructure of pure aluminum extruded by equal channel angular extrusion (ECAE) is investigated. The grain size of pure aluminum is decreased with the increase of ECAE times because of the large plastic shear deformation. The initial grain size is about 2μm and it becomes to about 1.2μm for one passage and 0.3μm for 8 passages.The hardness of pure aluminum is raised as extrusion times increase in four passages, while extrusion time is more than 4, it is not obvious to fine grain. The grain size and properties of materials can be improved by ECAE.

关 键 词：等通道转角挤压 纯铝 组织结构 亚晶 

分 类 号：TG379[金属学及工艺—金属压力加工] TG146.21[一般工业技术—材料科学与工程]