Grain Boundary Motion under Dynamic Loading: Mechanism and Large-Scale Molecular Dynamics Simulations

被引：11

作者：

Brandl, Christian ^{[1
,3
]}

Germann, Timothy C. ^{[1
]}

Perez-Bergquist, Alejandro G. ^{[2
]}

Cerreta, Ellen K. ^{[2
]}

机构：

[1] Los Alamos Natl Lab, Div Theoret, Los Alamos, NM USA

[2] Los Alamos Natl Lab, Mat Sci & Technol Div, Los Alamos, NM USA

[3] Karlsruhe Inst Technol, Karlsruhe, Germany

来源：

MATERIALS RESEARCH LETTERS | 2013年 / 1卷 / 04期

关键词：

Grain Boundary; Shock; Molecular Dynamics;

D O I：

10.1080/21663831.2013.830993

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Grain boundaries (GBs) are not static structures during shock loading, despite the short timescales. We present a mechanistic explanation for why non-coherent Sigma 3 GBs are particularly mobile, due to their consisting of coherent twin boundaries every third (111) glide plane, separated by incoherent twin boundary segments with three Shockley partial dislocations that can readily glide into either grain. Asymmetric GBs with such structures can thus move in response to the elastic driving force provided by uniaxial compression. We present large-scale molecular dynamic simulations that illustrate this mechanism, which explains the Sigma 3 GB faceting recently observed in shock-recovered copper multi-crystals.

引用

页码：220 / 227

页数：8

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