Deformation mechanism maps for micro-grained, ultrafine-grained, and nano-grained materials |
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Authors: | Farghalli A Mohamed |
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Affiliation: | Department of Chemical Engineering and Materials Science, University of California, Irvine, CA 92697-2575, USA |
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Abstract: | There are several deformation mechanisms that depend on grain size and are controlled by grain boundary diffusion. These mechanisms include: Coble creep, superplastic flow (micrograin superplastic flow and high-strain rate superplastic flow), and nanograin deformation. By combining the rate-controlling equations of these mechanisms and by making assumptions regarding triple-junction creep, a deformation map based on grain size was constructed. It is demonstrated that this map can account for the locations of experimental data representing three types of deformation behavior: micrograin superplasticity, high-strain rate superplasticity, and nanograin deformation. |
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Keywords: | Coble creep Deformation map High-strain rate superplasticity Micrograin superplasticity Nanocrystalline materials Triple-junction creep |
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