期刊论文详细信息
Crystals
Strategies to Approach Stabilized Plasticity in Metals with Diminutive Volume: A Brief Review
Lin Jiang1  Julie M. Schoenung1  Enrique J. Lavernia2  Tao Hu2  Amiya K. Mukherjee2 
[1] Materials Science, University of California, Davis, CA 95616, USA;;Department of Chemical Engineering &
关键词: plastic instability;    strain bursts;    nanopillars;    softening;    in situ TEM;   
DOI  :  10.3390/cryst6080092
来源: DOAJ
【 摘 要 】

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.

【 授权许可】

Unknown   

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