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Influence of stacking fault energy on microstructural development in equal-channel angular pressing

Published online by Cambridge University Press:  31 January 2011

Shogo Komura ,
Zenji Horita ,
Minoru Nemoto  and
Terence G. Langdon
Shogo Komura
Affiliation:
Department of Materials Science and Engineering, Faculty of Engineering, Kyushu University, Fukuoka 812–8581, Japan
Zenji Horita
Affiliation:
Department of Materials Science and Engineering, Faculty of Engineering, Kyushu University, Fukuoka 812–8581, Japan
Minoru Nemoto
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, California 90089–1453
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Abstract

Equal-channel angular (ECA) pressing is a procedure having the capability of introducing an ultrafine grain size into a material. Experiments were conducted to examine the effect of the low stacking fault energy in pure Cu on microstructural development during ECA pressing at room temperature. The results show that the low 0stacking fault energy and the consequent low rate of recovery lead to a very slow evolution of the microstructure during pressing. Ultimately, a stable grain size of −0.27 μm was established in pure Cu but the microstructure was not fully homogeneous even after pressing to a total strain of ∼10. It is shown by static annealing that the as-pressed grains are stable up to ∼400 K, but at higher temperatures there is grain growth. These results lead to the conclusion that a low stacking fault energy is especially favorable for the introduction of an exceptionally small grain size using the ECA pressing procedure.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 10 , October 1999 , pp. 4044 - 4050
Copyright
Copyright © Materials Research Society 1999

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