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Bimodal Structured Bulk Nanocrystalline Al-7.5Mg Alloy

Published online by Cambridge University Press:  01 February 2011

Zonghoon Lee
Affiliation:
Department of Materials Science, University of Southern California, Los Angeles, CA 90089–0241, U.S.A.
David B. Witkin
Affiliation:
Department of Chemical Engineering and Materials Science, University of California at Irvine, Irvine, CA 92697–2575, U.S.A.
Enrique J. Lavernia
Affiliation:
Department of Chemical Engineering and Materials Science, University of California at Davis, Davis, CA 95616, U.S.A.
Steven R. Nutt
Affiliation:
Department of Materials Science, University of Southern California, Los Angeles, CA 90089–0241, U.S.A.
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Abstract

The microstructure, mechanical properties and deformation of bimodal structured nanocrystalline Al-7.5Mg alloy were investigated. Grain refinement was achieved by cryomilling of atomized Al-7.5Mg powders, and then cryomilled nanocrystalline powders blended with 15% and 30% unmilled coarse-grained powders were consolidated by hot isostatic pressing followed by extrusion to produce bulk nanocrystalline alloys. Bimodal bulk nanocrystalline Al-7.5Mg alloys, which were comprised of nanocrystalline grains separated by coarse-grain regions, show balanced mechanical properties of enhanced yield and ultimate strength and reasonable ductility and toughness compared to comparable conventional alloys and nanocrystalline metals.

Type
Research Article
Copyright
Copyright © Materials Research Society 2004

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