A Jogged Dislocation Governed Strengthening Mechanism in Nanotwinned Metals

被引：111

作者：

Zhou, Haofei ^{[1
,3
,4
]}

Li, Xiaoyan ^{[3
,4
]}

Qu, Shaoxing ^{[1
,2
]}

Yang, Wei ^{[1
]}

Gao, Huajian ^{[3
]}

机构：

[1] Zhejiang Univ, Dept Engn Mech, Hangzhou 310027, Zhejiang, Peoples R China

[2] Zhejiang Univ, Int Ctr New Struct Mat, Hangzhou 310027, Zhejiang, Peoples R China

[3] Brown Univ, Sch Engn, Providence, RI 02912 USA

[4] Tsinghua Univ, Dept Engn Mech, Ctr Adv Mech & Mat, AML, Beijing 100084, Peoples R China

来源：

NANO LETTERS | 2014年 / 14卷 / 09期

关键词：

Jogged dislocation; threading dislocation; twin boundary; plastic deformation; atomistic simulation; COLUMNAR-GRAINED CU; DEFORMATION MECHANISMS; MAXIMUM STRENGTH; BOUNDARIES; BEHAVIOR; FILMS;

D O I：

10.1021/nl501755q

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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.

引用

页码：5075 / 5080

页数：6

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