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arXiv 1608.06381cond-mat.mtrl-sci
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MoSi2/Mo5Si3界面三元加成分离的第一性原理研究

First-principles study on segregation of ternary additions for MoSi2/Mo5Si3 interface

Koretaka Yuge

摘要:

采用第一性原理计算研究了添加元素M(= Ni,Cr)在MoSi 2-Mo 5 Si 3合金C11 b/D8 m界面的偏聚行为。我们首先发现了能量稳定的界面结构,界面能为0.08 eV/A^2。在稳定界面的基础上,计算了添加元素在单个原子层上的偏聚能,并将其应用于巨正则系综下的Monte Carlo统计模拟,定量预测了界面偏聚分布。我们发现,我们的模拟成功地捕捉到的特点,在测量偏析趋势(i)在界面上的Ni和Cr相比,体成分的强偏析的相似性,和(ii)更强的偏析Ni比Cr,这可以主要归因于计算的偏析能量的差异。实验结果表明,MoSi_2-Mo_5Si_3合金的偏聚界面是稳定的。

英文摘要:

We investigate segregation behavior of additive elements M (= Ni, Cr) at the C11b/D8m interface for MoSi2- Mo5Si3 alloys, based on first-principles calculation. We first find energetically stable interface structure with interface energy of 0.08 eV/A^2. Based on the stable interface, segregation energy for additive elements is calcu- lated for individual atomic layer, which is applied to Monte Carlo statistical simulation under grand-canonical ensemble to quantitatively predict interface segregation profile. We find that our simulation successfully capture the characteristics in measured segregation tendency of (i) Similarity in strong segregation at interface both for Ni and Cr compared with bulk composition, and (ii) stronger segregation for Ni than for Cr, which can be mainly attributed to differences in calculated segregation energy. The present results indicate that measured segregated interface for MoSi2-Mo5Si3 alloys can be thermodynamically stable.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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