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An investigation of grain boundaries in submicrometer-grained Al-Mg solid solution alloys using high-resolution electron microscopy

Published online by Cambridge University Press:  31 January 2011

Zenji Horita ,
David J. Smith ,
Minoru Furukawa ,
Minoru Nemoto ,
Ruslan Z. Valiev  and
Terence G. Langdon
Zenji Horita
Affiliation:
Department of Materials Science and Engineering, Faculty of Engineering 36, Kyushu University, Fukuoka 812, Japan
David J. Smith
Affiliation:
Center for Solid State Science and Department of Physics and Astronomy, Arizona State University, Tempe, Arizona 85287
Minoru Furukawa
Affiliation:
Department of Technology, Fukuoka University of Education, Munakata, Fukuoka 811-41, Japan
Minoru Nemoto
Affiliation:
Department of Materials Science and Engineering, Faculty of Engineering 36, Kyushu University, Fukuoka 812, Japan
Ruslan Z. Valiev
Affiliation:
Institute for Metals Superplasticity Problems, Russian Academy of Sciences, Ufa 450001, Russia
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

High-resolution electron microscopy was used to examine the structural features of grain boundaries in Al–1.5% Mg and Al–3% Mg solid solution alloys produced with submicrometer grain sizes using an intense plastic straining technique. The grain boundaries were mostly curved or wavy along their length, and some portions were corrugated with regular or irregular arrangements of facets and steps. During exposure to high-energy electrons, grain boundary migration occurred to reduce the number of facets and thus to reduce the total boundary energy. The observed features demonstrate conclusively that the grain boundaries in these submicrometer-grained materials are in a high-energy nonequilibrium configuration.

Type
Articles
Information
Journal of Materials Research , Volume 11 , Issue 8 , August 1996 , pp. 1880 - 1890
Copyright
Copyright © Materials Research Society 1996

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