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Fundamental Differences in Mechanical Behavior between Two Types of Crystals at the Nanoscale

Brinckmann, Stefan and Kim, Ju-Young and Greer, Julia R. (2008) Fundamental Differences in Mechanical Behavior between Two Types of Crystals at the Nanoscale. Physical Review Letters, 100 (15). Art. No. 155502. ISSN 0031-9007. doi:10.1103/PhysRevLett.100.155502.

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We present differences in the mechanical behavior of nanoscale gold and molybdenum single crystals. A significant strength increase is observed as the size is reduced to 100 nm. Both nanocrystals exhibit discrete strain bursts during plastic deformation. We postulate that they arise from significant differences in the dislocation behavior. Dislocation starvation is the predominant mechanism of plasticity in nanoscale fcc crystals, while junction formation and hardening characterize bcc plasticity. A statistical analysis of strain bursts is performed as a function of size and compared with stochastic models.

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Greer, Julia R.0000-0002-9675-1508
Additional Information:©2008 The American Physical Society. (Received 24 January 2008; published 17 April 2008) The authors gratefully acknowledge helpful discussions with C. Weinberger and W. Cai. J.R.G. acknowledges Caltech startup funds.
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Issue or Number:15
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:10245
Deposited By: Archive Administrator
Deposited On:18 Apr 2008
Last Modified:08 Nov 2021 21:06

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