Journal
ACTA MATERIALIA
Volume 56, Issue 3, Pages 511-517Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2007.09.044
Keywords
yield strength; crystal plasticity; extreme value statistics
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The compressive plastic strength of nanometer-scale single-crystal metallic pillars is larger than that found in conventionally sized samples. This behavior is generally associated with a change in the length scale that determines plastic behavior and the consequent inability of nanoscale samples to store dislocations. Here, we show in the case of nanocrystalline nickel pillars, for which there is a fixed microstructural length scale set by the grain size, that smaller is still stronger and find that this behavior derives from statistical expectations that have long been used to understand the size-dependent strength of brittle solids such as glass. (c) 2007 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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