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Bimodal Microstructure and Mechanical Properties of Cryomilled Nanocrystalline Al-7.5Mg

Published online by Cambridge University Press:  11 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 and mechanical properties consisting of tensile behavior and hardness of bulk nanocrystalline Al-7.5Mg alloy were investigated. Grain refinement was achieved by cryomilling of atomized Al-7.5Mg powders, and then nanocrystalline powders blended with 15% and 30% coarse-grained Al-7.5Mg powders were consolidated by hot isostatic pressing (HIP) followed by extrusion to produce bulk nanocrystalline Al-7.5Mg alloys. Bimodal structures, which enhance ductility and toughness of nanocrystalline metals, were produced that consisted of nanocrystalline grains and elongated coarse-grain bands. Examination of indentation revealed unusual deformation mechanisms and interactions between the coarse-grain bands and nanocrystalline regions. The ductile coarse-grain bands underwent extensive plastic deformation near indentation, while nanocrystalline regions exhibited limited deformation.

Type
Research Article
Copyright
Copyright © Materials Research Society 2003

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References

1. Hayes, R.W., Rodriguez, R. and Lavernia, E.J., Acta Mater., 2001, Vol. 49, pp. 4055–68.CrossRefGoogle Scholar
2. Lee, Z., Rodriguez, R., Lavernia, E.J. and Nutt, S.R., Ultrafine Grained Materials II, edited by Zhu, Y.T., Langdon, T.G., Mishra, R.S., Semiatin, S.L., Saran, M.J., and Lowe, T.C., TMS, Seattle, WA, 2002, pp. 653–59.Google Scholar
3. Lee, Z., Rodriguez, R., Hayes, R. W., Lavernia, E. J. and Nutt, S. R.: Metall. Mater. Trans. A, 2002, accepted.Google Scholar
4. Witkin, D., Lee, Z., Nutt, S. R. and Lavernia, E. J.: submitted in Scripita Mater.Google Scholar
5. Sun, X.K., Cong, H.T., Sun, M. and Yang, M.C.: Metall. Mater. Trans. A, 2000, Vol. 31A, pp. 1017–24.CrossRefGoogle Scholar

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