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Bridging the gap between computational and experimental length scales: A review on nanoscale plasticity

Greer, Julia R. (2006) Bridging the gap between computational and experimental length scales: A review on nanoscale plasticity. Reviews on Advanced Materials Science, 13 (1). pp. 59-70. ISSN 1606-5131.

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The results of both experimental studies and molecular dynamics simulations indicate that crystals exhibit strong size effects at the sub-micron scale: smaller is stronger. Until recently, experimental aspects of nano-scale deformation involved the effects of strain gradients, constraints of neighboring layers, grain boundaries, etc., which were key factors in observed size effects. Even without experimental constraints, many computational studies find that yield strength depends on sample size through a power relationship. Both experimental and computational results suggest that a fundamentally different plasticity mechanism might operate at the length scale of material's microstructure. In this work a brief review of some of these works is presented and compared with the results of our gold nanopillar micro-compression experiments, which were found to deform at nearly 50% of theoretical shear strength. To explain the observed size effect, we introduce our phenomenological model of hardening by dislocation starvation.

Item Type:Article
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Greer, Julia R.0000-0002-9675-1508
Additional Information:© 2006 Advanced Study Center Co. Ltd. Received: August 15, 2006.
Issue or Number:1
Record Number:CaltechAUTHORS:20110630-091922277
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:24264
Deposited By: Ruth Sustaita
Deposited On:30 Jun 2011 16:38
Last Modified:03 Oct 2019 02:54

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