Mechanical responses, texture and microstructural evolution of high purity aluminum deformed by equal channel angular pressing

查看全文 作　　者：[1,2,3]汪冰峰;[1]孙杰英;[1]邹金佃;VINCENT [2]Sherman;[1]李娟

机构地区：[1]School of Materials Science and Engineering, Central South University;[2]Departments of Mechanical and Aerospace Engineering and Nanoengineering, University of California;[3]Key Lab of Nonferrous Materials of Ministry of Education (Central South University)

出　　处：《Journal of Central South University》索引2015年第22卷第10期,共7页

基　　金：Project(12JJ2028)supported by the Hunan Provincial Natural Science Foundation of China;Project(201308430093)supported by the China Scholarship Council;Projects(201012200006,2013zzts185,2012zzts066)supported by the Freedom Explore Program of Central South University,China 摘　　要：Ultrafine-grained(UFG) high purity aluminum exhibits a variety of attractive mechanical properties and special deformation behavior. Equal channel angular pressing(ECAP) process can be used to easily and effectively refine metals. The microstructure and microtexture evolutions and grain boundary characteristics of the high purity aluminum(99.998%) processed by ECAP at room temperature are investigated by means of TEM and EBSD. The results indicate that the shear deformation resistance increases with repeated EACP passes, and equiaxed grains with an average size of 0.9 μm in diameter are formed after five passes. Although the orientations distribution of grains tends to evolve toward random orientations, and microtextures(80°, 35°, 0°),(40°, 75°, 45°) and(0°, 85°, 45°) peak in the sample after five passes. The grain boundaries in UFG aluminum are high-angle geometrically necessary boundaries. It is suggested that the continuous dynamic recrystallization is responsible for the formation of ultrafine grains in high purity aluminum. Microstructure evolution in the high purity aluminum during ECAP is proposed. 关键词：组织演变挤压变形高纯铝力学响应等通道转角挤压等径织构 ECAP

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Mechanical responses, texture and microstructural evolution of high purity aluminum deformed by equal channel angular pressing

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