Fundamental differences in mechanical behavior between two types of crystals at the nanoscale.

Citation data:

Physical review letters, ISSN: 0031-9007, Vol: 100, Issue: 15, Page: 155502

Publication Year:
2008
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Citations 192
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Repository URL:
http://scholarworks.unist.ac.kr/handle/201301/7629
PMID:
18518121
DOI:
10.1103/physrevlett.100.155502
Author(s):
Brinckmann, Steffen; Kim, Ju-Young; Greer, Julia R.
Publisher(s):
American Physical Society (APS); AMER PHYSICAL SOC
Tags:
Physics and Astronomy; DISLOCATION DYNAMICS SIMULATIONS; SINGLE-CRYSTALS; PLASTICITY SIZE; ATOMISTIC SIMULATION; STRAIN GRADIENTS; FCC METALS; THIN-FILMS; DEFORMATION; SCALE; MOTION
article description
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.