Significance of adiabatic heating in equal-channel angular pressing

作     者：Yamaguchi, D Horita, Z Nemoto, M Langdon, TG 

作者机构：Kyushu Univ Fac Engn Dept Mat Sci & Engn Fukuoka 8128581 Japan Univ So Calif Dept Mat Sci & Mech Engn Los Angeles CA 90089 USA 

出 版 物：《SCRIPTA MATERIALIA》 (材料学刊)

年 卷 期：1999年第41卷第8期

页      面：791-796页

核心收录：

学科分类：0806[工学-冶金工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：JRCM Super-Aluminum Project of the Japan Research and Development Center for Metals National Science Foundation, NSF, (DMR-9625969, INT-9602919) Japan Society for the Promotion of Science, KAKEN Ministry of Education, Culture, Sports, Science and Technology, MEXT New Energy and Industrial Technology Development Organization, NEDO Light Metal Educational Foundation 

主　　题：adiabatic heating aluminum extrusion microstructure 

摘      要：Equal-channel angular (ECA) pressing is a procedure in which a material is subjected to an increase plastic strain by pressing a sample through a special die. Adiabatic heating was measured during equal-channel angular pressing using samples of pure Al and three Al-based alloys. At a pressing speed of 18 mm s-1, there is an abrupt increase in the temperature on passing through the shearing plane and the magnitude of this temperature increase scales approximately with the ultimate tensile stress of the material. There is no significant adiabatic heating when using a pressing speed of 0.18 mm s-1 although the as-pressed microstructure at this speed is essentially identical to that attained at a pressing speed of 18 mm s-1.