期刊
NANO LETTERS
卷 14, 期 9, 页码 5075-5080出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl501755q
关键词
Jogged dislocation; threading dislocation; twin boundary; plastic deformation; atomistic simulation
类别
资金
- NSF [CMMI-1161749]
- MRSEC at Brown University [DMR-0520651]
- NICS [MS090046]
- Zhejiang University
- NSFC [11172264, 11222218, 11321202, 11372152]
- Thousand Young Talent Program of China
Atomistic simulations reveal a new and unique strengthening mechanism in nanotwinned metals governed by the collective motion of multiple necklace-like extended jogged dislocations. This mechanism prevails in a columnar-grained nanotwinned metal subject to an external stress parallel to the twin planes, provided the twin boundary spacing falls below a critical value. A theoretical model based on the depinning of unit jogs on twin planes is proposed to determine the flow stress associated with this deformation mechanism and is shown to be in agreement with atomistic simulations.
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