Microstructural dependence of vacancy diffusion in ordered alloys
Microstructural dependence of vacancy diffusion in ordered alloys
复制标题
有序合金中空位扩散的微观结构依赖性
DOI：
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发表时间：
1994
期刊：
影响因子：
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通讯作者：
B. Fultz
中科院分区：
文献类型：
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作者：
T. Lindsey;B. Fultz
通过蒙特卡罗模拟（MCS）研究了空位扩散相关因子对微观结构的依赖性。 MCS 使用激活态率理论来模拟空位扩散。我们改变了温度、有序域的大小以及域内的有序状态。发现空缺变动的相关性差异很大，并给出了数值。获得了两种不同的结果，一种用于在均质合金中排序，另一种用于在具有域的合金中排序。然而，考虑到域的存在，观察到空位相关因子与域大小无关。观察到相关函数的振荡，并将其归因于空位的成对捕获。
The dependence of the vacancy diffusional correlation factor on microstructure was investigated by Monte Carlo simulations (MCS). The MCS used activated state rate theory to model the vacancy diffusion. We varied the temperature, size of ordered domains, and the state of order within the domains. Correlations in the vacancy movement were found to vary widely, and numerical values are presented. Two different results were obtained, one for ordering in a homogeneous alloy and another for ordering in an alloy having domains. However, given the existence of domains, the vacancy correlation factor was observed to be independent of domain size. Oscillations in the correlation function were observed, and were attributed to pair trapping of the vacancy.