期刊
MATERIALS CHARACTERIZATION
卷 142, 期 -, 页码 504-514出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2018.06.003
关键词
ECCI; Heterogeneous plastic deformation; Boundary shear accommodation; Slip band propagation direction
类别
资金
- Department of Energy, Office of Science, Basic Energy Sciences [DE-FG02-09ER46637]
A new electron channeling contrast imaging (ECCI) based approach for the characterization of heterogeneous plastic deformation across multiple grains in a polycrystal is presented. The nature of the shear accommodation at grain boundaries has been assessed by evaluating the spatial distribution of dislocations and slip system activities near the boundaries and relating these observations to standard slip transfer criteria and the global state of stress. The direction of slip band propagation, and consequently the location of dislocation slip band nucleation, was determined by characterizing the slip band widths across individual grains. This assessment leads to a better understanding of the factors involved in polycrystalline deformation, including the grain boundary shear accommodation associated with both dislocation pile-ups and grain boundary dislocation nucleation. Because ECCI allows study of dislocation structures over large surface areas, and thus larger overall volumes than typically are accessible by other techniques, the overall approach allows the dislocation distribution across individual grains to be understood in terms of the broader polycrystalline constraints.
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