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Superplastic behavior of a fine-grained Mg–9Li material at low homologous temperature

Published online by Cambridge University Press:  31 January 2011

Eric M. Taleff ,
Oscar A. Ruano ,
Jeff Wolfenstine  and
Oleg D. Sherby
Eric M. Taleff
Affiliation:
Department of Mechanical Engineering, Stanford University, Stanford, California 94305-2205
Oscar A. Ruano
Affiliation:
Centro Nacional de Investigaciones MetalúArgicas, C.S.I.C., Av. de Gregorio del Amo 8, 28040 Madrid, Spain
Jeff Wolfenstine
Affiliation:
Department of Mechanical and Aerospace Engineering, University of California at Irvine, Irvine, California 92717
Oleg D. Sherby
Affiliation:
Department of Materials Science and Engineering, Stanford University, Stanford, California 94305-2205
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Abstract

A fine-grained ($\overline \iota$m) laminate containing 91.0 wt.% magnesium and 9.0 wt. % lithium was prepared by a foil metallurgy technique involving rolling and pressing at low homologous temperature (0.39–0.49 Tm). The processed material exhibits superplastic characteristics above 70 °C (0.40 Tm). The strain-rate-sensitivity exponent is about 0.5 and an elongation-to-failure of 450% was obtained at 100 °C (0.43 Tm). The activation energy for plastic flow in the superplastic region is 65 kJ/mole. This value of the activation energy is related to the expected activation energy for grain boundary diffusion.

Type
Articles
Information
Journal of Materials Research , Volume 7 , Issue 8 , August 1992 , pp. 2131 - 2135
Copyright
Copyright © Materials Research Society 1992

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References

1.Metenier, P., González-Doncel, G., Ruano, O. A., Wolfenstine, J., and Sherby, O. D., Mater. Sci. Engng. A125, 195 (1990).Google Scholar
2.Wolfenstine, J., González-Doncel, G., and Sherby, O. D., “Processing and Elevated Temperature Properties of Mg-9Li Laminates,” Metal and Ceramic Matrix Composites: Processing, Modeling and Mechanical Behavior, edited by Bhagat, R. B., Clauer, A. H., Kumar, P., and Ritter, A. M. (The Minerals, Metals and Materials Society, Warrendale, PA, 1990), pp. 263–270.Google Scholar
3.Ball, A. and Hutchinson, M. M., Met. Sci. J. 3, 1 (1969).Google Scholar
4.Sherby, O. D., Caligiuri, R. D., Kayali, E. S., and White, R. A., “Fundamentals of Superplasticity and its Applications,” Advances in Metal Processing, edited by Burke, J. J., Mehrabian, Robert, and Weiss, Volker (Plenum Press, New York, 1981), pp. 133–170.CrossRefGoogle Scholar
5.Barrett, C. R., Ardell, A. J., and Sherby, O. D., Trans. AIME 230, 200 (1964).Google Scholar
6.Hwang, J. C. M. and Balluffi, R. W., Scripta Metall. 12, 709 (1978).CrossRefGoogle Scholar
7.White, R. A., Ph.D. Dissertation, Stanford University (1978), Stanford, CA 94305.Google Scholar
8.Sherby, O. D. and Wadsworth, J., “Development and Characterization of Fine-Grain Superplastic Materials,” Deformation, Processing and Structure, edited by Krauss, G. (ASM, Metals Park, OH, 1984), pp. 355–389.Google Scholar
9.Köster, W., Z. Metallkd. 39, 1 (1948).Google Scholar