Title: Consideration of dislocation density in terms of high-temperature creep
Abstract: Most of the models which have been developed to explain the stress exponent of power law creep are based on the assumption that the dislocation density is proportional to the square of the applied stress. Feng et al. found the dislocation density to be independent of stress. As a result, Weertman and Weertman have recently suggested that the experimental data can be explained by post-creep deformation. Weertman and Weertman also suggested that if the high densities reported are accurate, they represent dislocations in a special configuration in which long-range stress fields are cancelled. A computer simulation investigation was undertaken to determine whether the observed densities were realistic in terms of high-temperature creep and whether the dislocation density was indeed independent of stress. The computer results indicate that (i) the dislocation densities are reasonable and (ii) there is a small increase in dislocation density with increasing stress, and a stress exponent of about 4 was obtained for the powerlaw region during steady state creep.
Publication Year: 1989
Publication Date: 1989-07-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 1
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