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首页> 外文期刊>Diffusion and Defect Data. Solid State Data, Part A. Defect and Diffusion Forum >In Situ TEM Investigation of Diffusion of Nano-Scale Liquid Pb Inclusions on Dislocations and in Bulk Aluminum
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In Situ TEM Investigation of Diffusion of Nano-Scale Liquid Pb Inclusions on Dislocations and in Bulk Aluminum

机译：纳米级液态铅夹杂物在位错和大块铝中扩散的原位TEM研究

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摘要

Diffusion of nano-sized liquid Pb inclusions in thin aluminum foils is investigated using in-situ transmission electron microscopy (TEM). Free diffusion of the inclusions in the bulk and diffusion constrained by dislocations trapping is studied. The motion of trapped Pb inclusions is spatially confined in close proximity to the dislocations. The diffusion coefficients of free motion of the inclusions are determined using Einstein's equation. The diffusion coefficients of trapped inclusions were obtained using an equation based on Smoluchowski's analysis of the Brownian motion of particle in a harmonic potential. The agreement of the diffusion coefficients of free and trapped inclusions indicates the same underlying microscopic mechanism, and no strong influence from dislocations. The microscopic mechanism controlling the mobility is discussed.
机译：使用原位透射电子显微镜（TEM）研究了纳米级液态Pb夹杂物在薄铝箔中的扩散。研究了夹杂物在主体中的自由扩散以及受位错俘获约束的扩散。捕获的Pb夹杂物的运动在空间上被限制在位错附近。使用爱因斯坦方程确定夹杂物自由运动的扩散系数。捕获的夹杂物的扩散系数是根据基于Smoluchowski对谐波势中粒子布朗运动的分析得出的方程得出的。自由夹杂物和俘获夹杂物的扩散系数的一致性表明相同的潜在微观机理，并且不受位错的强烈影响。讨论了控制迁移率的微观机制。

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