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Grain growth behavior of a nanostructured 5083 Al–Mg alloy

Published online by Cambridge University Press:  31 January 2011

V. L. Tellkamp ,
S. Dallek ,
D. Cheng  and
E. J. Lavernia
V. L. Tellkamp
Affiliation:
University of California—Irvine, Chemical, Biochemical and Materials Science Department, Irvine, California 92697
S. Dallek
Affiliation:
Naval Surface Warfare Center, Carderock Division, Code 683, 9500 MacArthur Boulevard, West Bethesda, Maryland 20817-5700
D. Cheng
Affiliation:
University of California—Irvine, Chemical, Biochemical and Materials Science Department, Irvine, California 92697
E. J. Lavernia
Affiliation:
University of California—Irvine, Chemical, Biochemical and Materials Science Department, Irvine, California 92697
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Abstract

A nanostructured 5083 Al–Mg alloy powder was subjected to various thermal heat treatments in an attempt to understand the fundamental mechanisms of recovery, recrystallization and grain growth as they apply to nanostructured materials. A low-temperature stress relaxation process associated with reordering of the grain boundaries was found to occur at 158 °C. A bimodal restructuring of the grains occurred at 307 °C for the unconstrained grains and 381 °C for the constrained grains. An approximate activation energy of 5.6 kJ/mol was found for the metastable nanostructured grains, while an approximate activation energy of 142 kJ/mol was found above the restructuring temperature.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 4 , April 2001 , pp. 938 - 944
Copyright
Copyright © Materials Research Society 2001

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