Microstructural evolution in high purity aluminum processed by ECAP

被引：217
作者：
Kawasaki, Megumi [1 ,2 ]
Horita, Zenji [3 ]
Langdon, Terence G. [1 ,2 ,4 ]
机构：
[1] Univ So Calif, Dept Aerosp & Mech Engn, Los Angeles, CA 90089 USA
[2] Univ So Calif, Dept Mat Sci, Los Angeles, CA 90089 USA
[3] Kyushu Univ, Fac Engn, Dept Mat Sci & Engn, Fukuoka 8190395, Japan
[4] Univ Southampton, Sch Engn Sci, Mat Res Grp, Southampton SO17 1BJ, Hants, England
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2009年 / 524卷 / 1-2期
基金：
美国国家科学基金会;
关键词：
Aluminum; Equal-channel angular pressing; Grain boundary misorientations; Microstructure; Ultrafine grains; GRAIN-REFINEMENT; CHANNEL; PRINCIPLES; TEXTURE; STRAIN; TOOL;
D O I：
10.1016/j.msea.2009.06.032
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
High purity (99.99%) aluminum was processed by equal-channel angular pressing (ECAP) through 1-12 passes and examined using orientation imaging microscopy. The results reveal two distinct processing regimes: from I to 4 passes the microstructure evolves from elongated subgrains to an essentially equiaxed array of ultrafine grains and from 4 to 12 passes there is no measurable change in the average grain size and grain aspect ratio. The boundary misorientation angle and the fraction of high-angle boundaries increase rapidly up to 4 passes and at a slower rate from 4 to 12 passes. Anomalously large grains were visible in the central region of the billet pressed through 12 passes due to dynamic recovery and grain growth. The results suggest optimum processing is achieved by pressing through 4-8 passes. (C) 2009 Elsevier B.V. All rights reserved.
引用
收藏
页码：143 / 150
页数：8
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