Diffusivity and Atomic Mobility in fcc Ni-Fe-V System: Experiment and Modeling
Diffusivity and Atomic Mobility in fcc Ni-Fe-V System: Experiment and Modeling
复制标题
面心立方 Ni-Fe-V 系统中的扩散率和原子迁移率：实验和建模
DOI：
10.1007/s11669-020-00824-2
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发表时间：
2020
影响因子：
1.4
通讯作者：
Zhou Peng
中科院分区：
文献类型：
--
作者：
Liu Huixin;Wen Shiyi;Liu Yuling;Du Yong;Min Qianhui;Liu Shuhong;Zhou Peng
本文采用固态扩散偶联技术研究了fcc Ni-Fe-V体系在1000、1100和1200℃时的三元扩散行为。采用Whittle-Green方法确定组分相关三元互扩散系数，通过误差传播计算不确定性，并通过热力学约束验证可靠性。分别与文献中二元Fe-Ni体系和Ni-V体系的主扩散系数进行了比较。结合热力学描述，利用DICTRA （DIffusion-Controlled TRAnsformations）软件对fcc Ni-Fe-V体系中的原子迁移率进行了计算。将模型预测的扩散行为与实验结果进行综合比较，包括浓度/扩散通量分布和扩散路径，证实了目前原子迁移率的可靠性。此外，根据目前得到的原子迁移率，绘制了1000、1100和1200℃时对角扩散率的三维曲面。利用Arrhenius方程计算了活化能和主扩散系数的频率因子的三维平面。这项工作是我们建立软磁合金和硬质合金通用动力学数据库工作的一部分。
In this work, the ternary diffusion behavior in fcc Ni-Fe-V system has been investigated by means of solid-state diffusion couple technique at 1000, 1100 and 1200 °C. The composition-dependent ternary interdiffusion coefficients were determined via Whittle-Green method, in which the uncertainties were calculated by error propagation and the reliability was validated via thermodynamic constraints. The ternary main interdiffusion coefficients ofandwere compared with the ones in binary Fe-Ni and Ni-V systems in the literature, respectively. The obtained interdiffusion coefficients combined with the thermodynamic description were employed to evaluate the atomic mobilities in fcc Ni-Fe-V system through the DICTRA (DIffusion-Controlled TRAnsformations) software package. A comprehensive comparison between the model-predicted diffusion behaviors and the experimental ones, including concentration/interdiffusion-flux distribution and diffusion path, confirms the reliability of the present atomic mobility. Besides, based on the presently obtained atomic mobilities, three-dimensional surfaces for the diagonal interdiffusivity at 1000, 1100 and 1200 °C were plotted. Furthermore, three-dimensional planes of the activation energy and frequency-factor of main interdiffusivities were evaluated using the Arrhenius equation. This work is part of our work to build a general kinetic database for soft magnetic alloys and cemented carbides.