An Evaluation of Creep Mechanisms in Ultrafine-Grained Metals

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Our earlier published creep data are analyzed for ultrafine-grained pure aluminium and copper processed by equal-channel angular pressing (ECAP). The analysis demonstrates conclusively that creep occurs in the investigated materials after ECAP by the same mechanism as in conventional coarse-grained materials with intergranular dislocation glide and climb as the dominant rate-controlling flow process. Under creep conditions examined in this work diffusion creep is not important in pure aluminium and copper because the ultrafine grains are unstable at elevated and/or high temperature creep and the grains grow sufficiently to preclude any significant contribution from Nabarro-Herring or Coble creep.

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Edited by:

Pavel Šandera

Pages:

382-385

Citation:

M. Kvapilová et al., "An Evaluation of Creep Mechanisms in Ultrafine-Grained Metals", Key Engineering Materials, Vol. 465, pp. 382-385, 2011

Online since:

January 2011

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