Athermal mechanisms of size-dependent crystal flow gleaned from three-dimensional discrete dislocation simulations

Rao, S.I.; Dimiduk, D.M.; Parthasarathy, T.A.; Uchic, M.D.; Tang, M.; Woodward, C.

doi:10.1016/j.actamat.2008.03.011

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Athermal mechanisms of size-dependent crystal flow gleaned from three-dimensional discrete dislocation simulations

Author(s): S.I. Rao , D.M. Dimiduk , T.A. Parthasarathy , M.D. Uchic , M. Tang , C. Woodward

Publication date Created: August 2008

Publication date (Print): August 2008

Journal: Acta Materialia

Publisher: Elsevier BV

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Sample dimensions influence strength and crystal plasticity.

Michael Uchic, Dennis M Dimiduk, Jeffrey N Florando … (2004)

When a crystal deforms plastically, phenomena such as dislocation storage, multiplication, motion, pinning, and nucleation occur over the submicron-to-nanometer scale. Here we report measurements of plastic yielding for single crystals of micrometer-sized dimensions for three different types of metals. We find that within the tests, the overall sample dimensions artificially limit the length scales available for plastic processes. The results show dramatic size effects at surprisingly large sample dimensions. These results emphasize that at the micrometer scale, one must define both the external geometry and internal structure to characterize the strength of a material.