RESOLVING DEFORMATION MODES OF NANOCRYSTALLINE METALS USING CONTINUUM METRICS BASED ON ATOMISTIC SIMULATIONS

摘要：

Deformation processes in nanocrystalline (NC) rnetals such as dislocaticn nucleation/absorption and grain boundary shuffling/sliding are mediated at interfaces.Grain boundaries and their junctions fundamentally control NC material inelastic deformation mechanisms.However,material deformation is inherently multiscale and quantifying failure criteria and scaling relations across multiple length/time scales has proven to be difficult.We apply recently developed volume-averaged kinematic variables from continuum mechanics as metrics to assess results of atomistic simulations.These metrics are computed using nearest neighbors and include kinematic quantities such as microrotaticn and dilatation.Useful insight into the origins of plastic deformation in NC metals is gained by their application,enabling resolution of the contributions of competing mechanisms to inelastic material deformation.

关键词： atomistic simulations grain boundaries dislocation nucleatton

作者: G.J.Tucker S.Tiwari J.A.Zimmerman D.L.McDowell

作者单位: School of Materials Science and Engineering,Georgia Institute of Technology,Atlanta,GA,30332,USA Sandia National Laboratories,Livermore,CA,94550,USA

会议类型: 国际会议

会议名称: The Third International Conference on Heterogeneous Material Mechanics(第三届国际非均匀材料力学会议)

会议地点: 上海

会议语种:英文

页码: 3-6

在线出版日期: 2011-05-22（万方平台首次上网日期，不代表论文的发表时间）