Cr-Al和Cr-V体系BCC相的扩散动力学研究

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Abstract On the basis of Cr/Cr-Al and Cr/Cr-V diffusion couples together with electron probe microanalysis technique, the composition-dependent interdiffusion coefficients in BCC phases of Cr-Al and Cr-V alloys were measured between 1 273 and 1 473 K via the Sauer-Freise method, and the method of error propagation was applied to evaluate the errors of the measured interdiffusivities. Based on the available thermodynamic information, self-diffusion and impurity-diffusion mobilities, and the measured interdiffusion coefficients, the atomic mobilities for the Cr-Al and Cr-V system BCC phases are obtained by using the DICTRA (calculation of phase diagrams) software with the method of CALPHAD (diffusion controlled transformation). Furthermore, the interdiffusion coefficient and component distance curves of diffusion pairs after diffusion annealing under different conditions are predicted. By comparing the predicted results with the experimental data, it is found that the predicted interdiffusion coefficient and component distance curve are in good agreement with the experimental data. The results show that the atomic mobility parameters optimized by DICTRA software can well predict the diffusion process of the Cr-Al and Cr-V system BCC phases at different temperatures, which illustrates the reliability of the atomic mobility parameters obtained in this work. This work contributes to enriches the kinetic databases of the Ti-based alloys.

Key words： diffusion kinetics atomic mobility parameter CALPHAD Cr-Al Cr-V diffusion coefficient

Received: 15 March 2021 Published: 10 November 2021

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TG113.12

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	Articles by authors
	JIN Youliang
	LIU Yuling
	DU Yong
	LIU Huixin
	WEN Shiyi
	MIN Qianhui
	DU Changfa
	ZHANG Shuyan
	CHU Mingqiang

Cite this article:

JIN Youliang,LIU Yuling,DU Yong, et al. Diffusion kinetics of BCC phase in Cr-Al and Cr-V systems[J]. Materials Science and Engineering of Powder Metallurgy, 2021, 26(5): 396-403.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2021/V26/I5/396

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