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Time Dependence of the Segregation of Diffusing Solute in Nanocrystalline Materials

机译:纳米晶材料中扩散溶质的偏析的时间依赖性

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At long times the effective solute diffusivity can be described by the (modified) Hart-Mortlock and Maxwell-Garnett equations for diffusion parallel and perpendicular to the grain boundary respectively. In this paper we analyze for the first time the time dependence of the effective solute diffusivity for these conditions. We assume that there are local regions (delineated by the diffusion length) in the grains adjacent to the grain boundary where the solute is equilibrated with the grain boundary. We write equations for the effective solute diffusivity with this assumption. Comparison with Monte Carlo simulations shows that this is quite a reasonable approximation for solute diffusion parallel to the grain boundary. For diffusion perpendicular to the grain boundary it is only a fair approximation unless the segregation is weak.
机译:在很长一段时间内,有效的溶质扩散率可以通过(修正的)Hart-Mortlock和Maxwell-Garnett方程来描述,分别用于平行和垂直于晶界的扩散。在本文中,我们首次分析了在这些条件下有效溶质扩散率的时间依赖性。我们假设在晶粒边界附近的晶粒中存在局部区域(由扩散长度表示),其中溶质与晶粒边界达到平衡。我们用这个假设写出有效溶质扩散率的方程。与蒙特卡洛模拟的比较表明,对于平行于晶界的溶质扩散,这是一个相当合理的近似值。对于垂直于晶界的扩散,除非偏析微弱,否则它只是一个合理的近似值。

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