A Jogged Dislocation Governed Strengthening Mechanism in Nanotwinned Metals
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- 作者：Haofei Zhou ; Xiaoyan Li ; Shaoxing Qu ; Wei Yang ; Huajian Gao
- 刊名：Nano Letters
- 出版年：2014
- 出版时间：September 10, 2014
- 年：2014
- 卷：14
- 期：9
- 页码：5075-5080
- 全文大小：418K
- ISSN：1530-6992
文摘
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.