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Crystals 2016, 6(8), 92; doi:10.3390/cryst6080092

Strategies to Approach Stabilized Plasticity in Metals with Diminutive Volume: A Brief Review

1
Department of Chemical Engineering & Materials Science, University of California, Davis, CA 95616, USA
2
Department of NanoEngineering, University of California San Diego, La Jolla, CA 92093, USA
3
Department of Chemical Engineering & Materials Science, University of California, Irvine, CA 92607, USA
*
Authors to whom correspondence should be addressed.
Academic Editors: Helmut Cölfen and Ronald W. Armstrong
Received: 29 April 2016 / Revised: 1 August 2016 / Accepted: 4 August 2016 / Published: 9 August 2016
(This article belongs to the Special Issue Crystal Dislocations)
View Full-Text   |   Download PDF [2137 KB, uploaded 9 August 2016]   |  

Abstract

Micrometer- or submicrometer-sized metallic pillars are widely studied by investigators worldwide, not only to provide insights into fundamental phenomena, but also to explore potential applications in microelectromechanical system (MEMS) devices. While these materials with a diminutive volume exhibit unprecedented properties, e.g., strength values that approach the theoretical strength, their plastic flow is frequently intermittent as manifested by strain bursts, which is mainly attributed to dislocation activity at such length scales. Specifically, the increased ratio of free surface to volume promotes collective dislocation release resulting in dislocation starvation at the submicrometer scale or the formation of single-arm dislocation sources (truncated dislocations) at the micrometer scale. This article reviews and critically assesses recent progress in tailoring the microstructure of pillars, both extrinsically and intrinsically, to suppress plastic instabilities in micrometer or submicrometer-sized metallic pillars using an approach that involves confining the dislocations inside the pillars. Moreover, we identify strategies that can be implemented to fabricate submicrometer-sized metallic pillars that simultaneously exhibit stabilized plasticity and ultrahigh strength. View Full-Text
Keywords: plastic instability; strain bursts; nanopillars; softening; in situ TEM plastic instability; strain bursts; nanopillars; softening; in situ TEM
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Hu, T.; Jiang, L.; Mukherjee, A.K.; Schoenung, J.M.; Lavernia, E.J. Strategies to Approach Stabilized Plasticity in Metals with Diminutive Volume: A Brief Review. Crystals 2016, 6, 92.

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