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Grain boundary structure in Al–Mg and Al–Mg–Sc alloys after equal-channel angular pressing

Published online by Cambridge University Press:  31 January 2011

Keiichiro Oh-ishi ,
Zenji Horita ,
David J. Smith  and
Terence G. Langdon
Keiichiro Oh-ishi
Affiliation:
Department of Materials Science and Engineering, Kyushu University, Fukuoka 812–8581, Japan
Zenji Horita
Affiliation:
Department of Materials Science and Engineering, Kyushu University, Fukuoka 812–8581, Japan
David J. Smith
Affiliation:
Center for Solid State Science and Department of Physics and Astronomy, Arizona State University, Tempe, Arizona 85287–1504
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

Samples of an Al–3% Mg alloy and an Al–3% Mg–0.2% Sc alloy were subjected to equal-channel angular pressing (ECAP) to reduce the grain size to approximately 0.2–0.3 μm. Some samples of each alloy were also annealed for 1 h at temperatures of either 423 or 673 K, respectively. High-resolution electron microscopy was used to examine the microstructure both before and after annealing. The grain boundaries after ECAP were wavy and faceted and in high-energy nonequilibrium configurations. These results were consistent with earlier observations of materials subjected to severe plastic deformation using high-pressure torsion. In addition, some grain boundaries in the Al–Mg–Sc alloy had a zigzag appearance after annealing at 673 K, where the straight portions of the boundary were identified as low-energy {111} planes. It is suggested these are mobile boundaries lying in a lowest energy configuration where mobility may be restricted by the presence of incoherent Al3Sc particles.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 2 , February 2001 , pp. 583 - 589
Copyright
Copyright © Materials Research Society 2001

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