A gradient Eshelby force on twinning partial dislocations and associated detwinning mechanism in gradient nanotwinned metals

被引:8
|
作者
Zhou, Haofei [1 ,2 ]
Zhu, Panpan [1 ,2 ]
Yang, Wei [1 ,2 ]
Gao, Huajian [3 ,4 ]
机构
[1] Zhejiang Univ, Ctr X Mech, Hangzhou 310027, Peoples R China
[2] Zhejiang Univ, State Key Lab Fluid Power & Mechatron Syst, Dept Engn Mech, Hangzhou 310027, Peoples R China
[3] Nanyang Technol Univ, Coll Engn, Sch Mech & Aerosp Engn, 70 Nanyang Dr, Singapore 639798, Singapore
[4] ASTAR, Inst High Performance Comp, Singapore 138632, Singapore
基金
中国国家自然科学基金;
关键词
Gradient nanotwinned metals; Eshelby force; Twinning partial dislocation; Detwinning; Twin boundary migration; Molecular dynamics simulation; DEFORMATION MECHANISMS; MAXIMUM STRENGTH; GROWTH TWINS; PLASTICITY; CU;
D O I
10.1016/j.jmps.2021.104746
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
ABSTR A C T It is well known that the driving force on dislocation glide is the Peach-Koehler force which is proportional to the resolved shear stress on the slip plane. Here, we report a type of configura-tional force, referred to as the gradient Eshelby force, that can drive the motion of twinning partial dislocations on twin boundaries (TBs) in the absence of any resolved shear stress and cause detwinning in gradient nanotwinned (GNT) metals, an emerging class of multiscale metallic materials with exceptional mechanical properties and novel deformation mechanisms. Specif-ically, we consider the Eshelby-force-driven motion of twinning partial dislocations and associ-ated detwinning mechanism in GNT metals made of preferentially oriented TBs and columnar grain boundaries (GBs) with spatially varying twin spacing and grain size. Large-scale molecular dynamics simulations validate the proposed Eshelby-driven detwinning mechanism, where twinning partial dislocations are nucleated from GBs and glide on TBs near the region with the steepest local gradient, leading to extensive TB migration and twin annihilation. This study demonstrates the important role of Eshelby force in controlling twinning partial glide and TB migration in GNT metals, which may have broad implications on plastic deformation in gradient nanostructured metals.
引用
收藏
页数:10
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