Co-Cr-V三元系富Co侧fcc相的互扩散及原子迁移率参数研究

Interdiffusion and Atomic Mobilities in Co-rich fcc Co-Cr-VAlloys

摘要:

本研究制备了一系列Co-Cr-V合金，在1200℃下扩散处理259200 s。利用EPMA技术测定了各扩散偶的浓度-距离曲线，并根据测得的浓度-距离曲线用Whittle and Green方法计算了Co-Cr-V三元系在1200℃下的互扩散系数。基于本研究的实验数据和文献报道的热力学信息和相关子二元系的动力学参数，利用DICTRA软件优化得到Co-Cr-V体系fcc相的扩散迁移率参数。运用优化得到的原子迁移率参数计算互扩散系数，并与实验数据比对，取得较好的一致性，从而验证了所得迁移率参数的可靠性。同时运用该迁移率参数计算了各扩散偶的浓度-距离曲线和扩散路径，计算结果与实验数据均符合良好，进一步验证了参数的合理性和准确性。

Abstract:

Diffusion couples for Co-rich fcc Co-Cr-V alloys were prepared, all of which were annealed at 1473 K for 259200 s. The interdiffusion coefficients in fcc Co-Cr-V ternary systems were investigated by means of Whittle and Green method with the help of electronic-probe microanalysis. On the basis of the thermodynamic parameters available in the literature, the interdiffusion data were critically assessed to develop the atomic mobilities for the fcc Co-Cr-V alloys via the DICTRA software. Comprehensive comparisons between calculated and experimental diffusion coefficients showed that the experimental data could be well reproduced by the atomic mobilities obtained in this work. And the validity of the diffusion mobilities was tested by simulating the concentration-distance profiles and diffusion paths in diffusion couples.