期刊
PHYSICAL REVIEW LETTERS
卷 109, 期 9, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.109.095507
关键词
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资金
- NSERC
- NSF [DMR 03-25939 ITR, DMR 1005209, DMR-0748267]
- ONR [N00014-09-1-0883]
- Kavli Institute of Theoretical Physics at UC Santa Barbara
We show that slowly sheared metallic nanocrystals deform via discrete strain bursts (slips), whose size distributions follow power laws with stress-dependent cutoffs. We show for the first time that plasticity reflects tuned criticality, by collapsing the stress-dependent slip-size distributions onto a predicted scaling function. Both power-law exponents and scaling function agree with mean-field theory predictions. Our study of 7 materials and 2 crystal structures, at various deformation rates, stresses, and crystal sizes down to 75 nm, attests to the universal characteristics of plasticity.
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