Energetic, structural and mechanical properties of terraced interfaces

被引:14
|
作者
Dodaran, M. [1 ]
Wang, J. [2 ]
Chen, Y. [3 ]
Meng, W. J. [1 ]
Shao, S. [1 ]
机构
[1] Louisiana State Univ, Dept Mech & Ind Engn, Baton Rouge, LA 70803 USA
[2] Univ Nebraska, Dept Mech & Mat Engn, Lincoln, NE 68588 USA
[3] Univ N Carolina, Dept Mech Engn & Engn Sci, Charlotte, NC 28223 USA
基金
美国国家科学基金会;
关键词
Semi-coherent interfaces; Disconnections; Misfit dislocations; Mechanical response; Interface energy; DISLOCATION NUCLEATION; DEFORMATION MECHANISMS; BIMETAL INTERFACES; ALUMINUM NITRIDE; SHEAR-STRENGTH; BOUNDARIES; SURFACES; BEHAVIOR; DEFECTS; MISFIT;
D O I
10.1016/j.actamat.2019.04.016
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Taking the well-understood Cu-Ni [111} semi-coherent interface as a prototype, we demonstrate an important, yet long-been-overlooked, size effect on the properties of terraced interfaces - i.e. the facet length scale effect. Interfacial facets are considered as super interface disconnections (SIDS). We then studied the SID's size effect on the energy, structure, and mechanical response of terraced interfaces by using atomistic simulations and defect theories. We found that the specific facet energy therefore the specific energy of the terraced interface exhibits a periodic change with the SID's size. The periodic change is associated with the quantized transitions in their dislocation structures. Correspondingly, the mechanical response of terraced interfaces also exhibits clear regime shifts, as reflected in changes in the nucleation and emission mechanisms for lattice dislocations. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码:92 / 107
页数:16
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