期刊
PHILOSOPHICAL MAGAZINE
卷 92, 期 14, 页码 1748-1763出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/14786435.2012.657710
关键词
grain boundary diffusion; Harrison kinetics regimes; solute diffusion; solute segregation
类别
资金
- Australian Research Council
- Department of Energy, Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Vehicle Technologies [DE-AC05-00OR22725]
- UT-Battelle, LLC.
Knowledge of the limits of the principal Harrison kinetics regimes (Types A, B and C) for grain boundary diffusion is very important for the correct analysis of depth profiles in a tracer diffusion experiment. These regimes for self-diffusion have been extensively studied in the past by making use of the phenomenological lattice Monte Carlo (LMC) method with the result that the limits are now well established. However, the relationship of these self-diffusion limits to the corresponding ones for solute diffusion in the presence of solute segregation to the grain boundaries remains unclear. In the present study, the influence of solute segregation on the limits was investigated with the LMC method for the well-known parallel grain boundary slab model by showing the equivalence of two diffusion models. It is shown which diffusion parameters are useful for identifying the limits of the Harrison kinetics regimes for solute grain boundary diffusion. It is also shown how the measured segregation factor from the diffusion experiment in the Harrison Type-B kinetics regime may differ from the global segregation factor.
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