First-principles study of 3sp impurity (S, P, Si, Al) effects on vacancy-mediated diffusion in Ni and Ni-33Cr alloys
First-principles study of 3sp impurity (S, P, Si, Al) effects on vacancy-mediated diffusion in Ni and Ni-33Cr alloys
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3sp 杂质(S、P、Si、Al)对 Ni 和 Ni-33Cr 合金中空位介导扩散影响的第一性原理研究
DOI:
10.1016/j.commatsci.2022.111768
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发表时间:
2022
影响因子:
3.3
通讯作者:
Tucker, Julie D.
中科院分区:
文献类型:
--
作者:
Ke, Jia-Hong;Tucker, Julie D.
The effect of minor impurities on vacancy-mediated processes is a critical factor causing unanticipated degradation rates in structural alloys. We investigate the 3spimpurity effect by first-principles calculations to derive impurity-modified diffusion in dilute Ni. Calculations are also performed for special quasi-random structures (SQSs) of Ni-33Cr to investigate the similarity of representative hops that affect vacancy-mediated kinetics. The results show considerable enhancement of vacancy mobility by P and S for Ni and Ni-Cr alloys due to vacancy binding and reduced migration barriers of the re-orientation hops at the vicinity of the impurity atom. The enhanced diffusion can cause variability of microstructure changes and degradation rates in industrial Ni-based alloys, particularly for structural components where local segregation of impurities can occur due to non-equilibrium conditions.
DOI:
--
发表时间:
2010
期刊:
影响因子:
--
作者:
D. Morgan
通讯作者:
D. Morgan
影响因子:
1.6
作者:
M. Nastar
通讯作者:
M. Nastar
影响因子:
9.4
作者:
Ke, Jia-Hong;Young, George A.;Tucker, Julie D.
通讯作者:
Tucker, Julie D.