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Processing by Equal-Channel Angular Pressing: Potential for Achieving Superplasticity

Published online by Cambridge University Press:  10 February 2011

Minoru Furukawa,
Minoru Nemoto,
Zenji Horita and
Terence G. Langdon
Minoru Furukawa
Affiliation:
Department of Technology, Fukuoka University of Education, Munakata, Fukuoka 811-4192, Japan
Minoru Nemoto
Affiliation:
Department of Materials Science and Engineering, Faculty of Engineering, Kyushu University, Fukuoka 812-8581, JapanNow at Sasebo National College of Technology, 1-1 Okishin-cho, Sasebo 857-1193, Japan
Zenji Horita
Affiliation:
Department of Materials Science and Engineering, Faculty of Engineering, Kyushu University, Fukuoka 812-8581, Japan
Terence G. Langdon
Affiliation:
Departments of Materials Science and Mechanical Engineering, University of Southern California, Los Angeles, CA 90089-1453, U.S.A. langdon@usc.edu
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Abstract

Equal-channel angular (ECA) pressing is a processing procedure whereby a very severe plastic strain is imposed on a sample without any change in the cross-sectional dimensions of the material. This processing method leads to a substantial grain refinement, producing grains which are within the submicrometer or even the nanometer scale. This paper discusses the potential for using this method to prepare materials for superplasticity. The results demonstrate that it is possible to achieve superplastic deformation in selected materials subjected to ECA pressing and, in addition, there is the possibility of extending the superplastic region so that it occurs at very rapid strain rates.

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