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Deformation Mechanisms and Ductility of Nanostructured Al Alloys

Published online by Cambridge University Press:  15 March 2011

Bing Q. Han ,
Farghalli A. Mohamed  and
Enrique J. Lavernia
Bing Q. Han
Affiliation:
Department of Chemical Engineering and Materials Science, University of California, Davis, CA 95616
Farghalli A. Mohamed
Affiliation:
Department of Chemical Engineering and Materials Science, University of California, Irvine, CA 92697
Enrique J. Lavernia
Affiliation:
Department of Chemical Engineering and Materials Science, University of California, Davis, CA 95616
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Abstract

Low tensile ductility is one of the critical challenges facing the science and technology of nanostructured materials. As an example, despite the fact that high strength is frequently observed in bulk nanostructured Al alloys, ductility and work hardening are often observed to decrease with decreasing grain size. In the present study, the tensile ductility of bulk nanostructured aluminum alloys processed via severe plastic deformation and consolidation of mechanically milled powders is analyzed. Adding coarse grains to the nanostructured matrix is proposed as an approach to improve ductility.

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