Nanosized solid Pb inclusions in Al have fcc structure and perfect cuboctahedral shape. When the inclusions melt they attain a rounded equilibrium shape and due to the low miscibility between the two elements, the liquid inclusions are retained as individual nanosized droplets located inside the solid Al matrix. As the temperature is increased the smaller liquid Pb inclusions are observed to move in a three-dimensional random walk over distances that can be orders of magnitude larger than their size. Inclusions attached to dislocations exhibit a similar type of random walk confined to long-distance one-dimensional movement along the dislocation lines and short-range two-dimensional vibrations perpendicular to the dislocation lines. The diffusion coefficients of the moving inclusions can be obtained from an Einstein-Smoluchowski analysis of the inclusion traces providing input for information on the mechanisms responsible for the movements. (c) 2005 Springer Science + Business Media, Inc.
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机译：Al中的纳米级固态Pb夹杂物具有fcc结构和完美的立方八面体形状。当夹杂物熔化时，它们会达到圆形的平衡形状，并且由于两种元素之间的低溶混性，液体夹杂物会保留为位于固态Al基体内部的单个纳米大小的液滴。随着温度升高，观察到较小的液态Pb夹杂物会在三维随机游动中移动，其距离可能比其大小大几个数量级。附着在位错上的夹杂物表现出类似的随机游动，其类型仅限于沿着位错线的长距离一维运动和垂直于位错线的短距离二维振动。运动夹杂物的扩散系数可以从对夹杂物痕迹的爱因斯坦-斯莫卢霍夫斯基分析中获得，从而为负责移动的机理信息提供输入。 （c）2005年Springer Science + Business Media，Inc.
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