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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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