Sample dimensions influence strength and crystal p...[Science. 2004] - PubMed Result

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1: Science. 2004 Aug 13;305(5686):986-9.

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Science. 2004 Nov 12;306(5699):1134-5; author reply 1134-5.

Sample dimensions influence strength and crystal plasticity.

Uchic MD, Dimiduk DM, Florando JN, Nix WD.

Air Force Research Laboratory, Materials & Manufacturing Directorate, Wright-Patterson Air Force Base, OH 45433-7817, USA. michael.uchic@wpafb.af.mil

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.

PMID: 15310897 [PubMed]

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