The segregation behavior of manganese and silicon at the coherent interfaces of copper precipitates in ferritic steels

The segregation behavior of manganese and silicon at the coherent interfaces of copper precipitates in ferritic steels
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铁素体钢中铜析出相共格界面处锰和硅的偏析行为

DOI:
10.1016/j.jnucmat.2013.10.054
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发表时间:
2014-02
影响因子:
3.1
通讯作者:
S. J. Zhao
S. J. Zhao
中科院分区:
工程技术2区
文献类型:
--
作者:
Y. P. Xie;S. J. Zhao

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采用第一性原理计算方法研究了Mn和Si在铁素体钢中Cu析出相界面上的偏聚行为。我们发现,在Cu沉淀物的界面处的替位Mn和Si的偏聚能都可以忽略不计。然而,能量学表明,在Fe/Cu共格界面处含有Mn或Si的自间隙哑铃(Mn@SI或Si@SI)1比分别包含在纯铁或Cu相中的Mn@SI或Si@SI更有利。替代缺陷、Mn@SI、Si@SI和纯铁自填隙哑铃的相对稳定性可以很好地解释在辐照和热时效条件下Mn和Si在铁素体钢中Cu析出相上的偏聚行为的差异。此外,我们还发现Mn@SI和Si@SI的偏聚导致铁素体钢中Cu析出相界面的脆化趋势。
We have performed first-principles calculations to study the segregation behavior of Mn and Si at the interfaces of Cu precipitates in ferritic steels. We find that both the segregation energies of substitutional Mn and Si at the interfaces of the Cu precipitates are negligible. However, the energetics indicate that the self-interstitial dumbbells containing Mn or Si (Mn@SI or Si@SI)1at the coherent interface of Fe/Cu is more favorable than the Mn@SI or Si@SI embodied in pure Fe or Cu phases, respectively. The relative stability of the substitutional defects, Mn@SI, Si@SI, and pure Fe self-interstitial (SI) dumbbells can well account for the difference in segregation behavior of Mn and Si at Cu precipitates in the ferritic steels under the condition of irradiation and thermal aging. Furthermore, we find that both the Mn@SI and Si@SI segregation result an embrittlement trend on the interfaces of Cu precipitates in ferritic steels.
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