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Bimodal Structured Bulk Nanocrystalline Al-7.5Mg Alloy

Published online by Cambridge University Press:  01 February 2011

Zonghoon Lee ,
David B. Witkin ,
Enrique J. Lavernia  and
Steven R. Nutt
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
Information
MRS Online Proceedings Library (OPL) , Volume 791: Symposium Q – Mechanical Properties of Nanostructured Materials and Nanocomposites , 2003 , Q1.6
Copyright
Copyright © Materials Research Society 2004

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References

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