Affiliation:
1. University of Strathclyde
Abstract
The conventional consensus has it that the magnitude of the strain rate sensitivity observed in superplastic materials is linked with grain boundary sliding. The grain boundary sliding mechanism is thought to theoretically produce a strain rate sensitivity exponent of 0.5, which is in good agreement with experimental data. The present paper argues that a rate sensitivity of 0.5 can be generated by dislocation slip under certain temperature and strain rate regimes that overlap with conditions representative of superplasticity. A physically based slip model that links the relevant microstructural parameters to the macroscopic strain rate is proposed.
Publisher
Trans Tech Publications, Ltd.
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science
Reference15 articles.
1. Hazzledine, P.M. & Newbury, D.E., Grain Boundary Structure and Properties, Ed's G.A. Chadwick & D.A. Smith, Academic Press, pp.235-264 (1976).
2. Dieter, G.E. Mechanical Metallurgy, McGraw-Hill Int. Book Co., 2nd Ed (1981).
3. Raj, R. & Ghosh, A.K.; Acta Metall., Vol. 29, pp.283-292 (1981).
4. Langdon, T.G., Grain Boundary Sliding Revisited: Developments in Sliding over Four Decades, J. Mater. Sci, 41, pp.597-609 (2006).
5. Ball, A. & Hutchinson, M.M., Met. Sci, J., Vol. 3, pp.1-7 (1969).
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