Recommendations for simplified yet robust assessments of atomic mobilities and diffusion coefficients of ternary and multicomponent solid solutions

Recommendations for simplified yet robust assessments of atomic mobilities and diffusion coefficients of ternary and multicomponent solid solutions
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对三元和多组分固溶体的原子迁移率和扩散系数进行简化而稳健的评估的建议

DOI:
10.1016/j.scriptamat.2021.114227
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发表时间:
2022
期刊:
影响因子:
6
通讯作者:
Zhao, Ji-Cheng
Zhao, Ji-Cheng
中科院分区:
材料科学1区
文献类型:
--
作者:
Zhong, Wei;Zhao, Ji-Cheng

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本文将单参数Z-Z-Z二元扩散系数模型推广到三元和多元体系。原子迁移率中的交叉二元和三元相互作用参数在4种三元固溶体上系统地测试(扩散系数)评估:fcc Ag-Au-Cu,fcc Co-Fe-Ni,fcc Cu-Fe-Ni,和bcc Nb-Ti-V。Z-Z-Z二元模型参数的简单组合,没有任何额外的拟合参数,已经提供了令人印象深刻的预测三元扩散系数时,3个交叉-二元参数被设置为相应的二元Z-Z-Z模型相互作用参数,从而得到鲁棒的Z-Z-三元扩散模型。使用3个独立的交叉二进制拟合参数可以产生更好的仅二进制和交叉二进制参数(BCBPO)模型。根据现有的实验三元扩散系数的量提出建议。这些建议将大大减少拟合参数的数量,提高计算材料设计的原子迁移率和扩散系数数据库的鲁棒性。
This study extends a 1-parameter Z-Z-Z binary diffusion coefficient model to ternary and multicomponent systems. The cross-binary and ternary interaction parameters in atomic mobility (diffusion coefficient) assessments were systematically tested on 4 ternary solid solutions: fcc Ag-Au-Cu, fcc Co-Fe-Ni, fcc Cu-Fe-Ni, and bcc Nb-Ti-V. A simple combination of the Z-Z-Z binary model parameters without any additional fitting parameters already provides impressive predictions of the ternary diffusion coefficients when the 3 cross-binary parameters are set to be the corresponding binary Z-Z-Z model interaction parameters, leading to a robustZ-Z-ternarydiffusion model. Employment of 3 independent cross-binary fitting parameters leads to an even betterbinary and cross-binary parameters only(BCBPO) model. Recommendations are rendered based upon the amount of available experimental ternary diffusion coefficients. These recommendations will substantially reduce the number of fitting parameters and improve the robustness of the resultant atomic mobility and diffusion coefficient databases for computational materials design.
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