Nanometer Scale Mechanical Behavior of Grain Boundaries

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题名:	Nanometer Scale Mechanical Behavior of Grain Boundaries
作者:	Wang, C. K., Chew, H. B., Kim, K. S.
关键词:	fracture;grain boundaries;embrittlement
日期:	2011-12-01
上传时间:	2016-01-06 11:06:24 (UTC+8)
摘要:	A nonlinear field projection method has been developed to study nanometer scale mechanical properties of grain boundaries in nanocrystalline FCC metals. The nonlinear field projection is based on the principle of virtual work, for virtual variations of atomic positions in equilibrium through nonlocal interatomic interactions such as EAM potential interaction, to get field-projected subatomic-resolution traction distributions on various grain boundaries. The analyses show that the field projected traction produces periodic concentrated compression sites on the grain boundary, which act as crack trapping or dislocation nucleation sites. The field projection was also used to assess the nanometer scale failure processes of Cu Σ5 grain boundaries doped with Pb. It was revealed that the Pb dopants prevented the emission of dislocations by grain boundary slip and embrittles the grain boundary.
關聯:	MRS Online Proceedings Library Archive 1297, pp.1-9
DOI:	10.1557/opl.2011.678
显示于类别:	[土木工程學系暨研究所] 期刊論文

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