第一原理计算Al-Cu-Mg体系中FCC相的扩散系数

来源 :第十二届国际凝聚态理论与计算材料学会议(The 12th International Conference on Con | 被引量 : 0次 | 上传用户:m2564
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  本文将密度泛函理论与冻声子方法相结合,计算了Al-Cu-Mg体系Fcc-AI相的扩散矩阵,分别包括Al、Cu、Mg的三个自扩散系数和Al基、Cu基和Mg基的六个低浓度杂质扩散系数。自扩散系数的计算采用空位扩散机制,同时得到了扩散前因子和激活能;而杂质扩散系数的计算除得到与自扩散类似的参数外,还由用五频率模型给出随温度变化的关联因子、过渡态理论给出跳跃频率、以及空位形成能和“空位一杂质”成键能。
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