Ti-Al-Cr体系高温BCC相扩散及原子移动性

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Abstract The diffusion study of titanium and its alloys can benefit to predict the phase constitution and microstructure evolution of titanium alloys during heat treatment. In this work, the diffusion behavior in BCC phase of Ti-Al-Cr ternary system was studied through diffusion couples method, a series of diffusion couples which was prepared and annealed separately at 1 373 K and 1 473 K for 8 h. The composition-distance profile measured via EPMA was fitted by ERFEX function. The inter-diffusion coefficients and impurity diffusion coefficients were extracted by Whittle-Green method and Hall method. It was found that the diffusion rate of Al in BCC phase of Ti-Al-Cr system is much faster than Cr. Meanwhile main diffusion coefficients and impurity diffusion coefficients of Al increase as the concentration of Al and Cr increase, which is contrary for Cr. The diffusion coefficients measured in experiments were used to assess the atomic mobility and develop the atomic mobility database of the BCC phase in the Ti-Al-Cr system. The comparison between the simulated results (including composition-distance profiles, diffusion paths and main diffusion coefficients) and the experimental data showed a good consistency, which verify the accuracy of the database.

Key words： Ti-Al-Cr alloys diffusion couples diffusion coefficient Whittle-Green method Hall method atomic mobility

Received: 28 February 2021 Published: 21 July 2021

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	Articles by authors
	WU Chenjian
	BAI Weimin
	GAO Ning
	LIU Libin
	ZHANG Ligang

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WU Chenjian,BAI Weimin,GAO Ning, et al. Diffusion and atomic mobility of high temperature BCC phase in Ti-Al-Cr system[J]. Materials Science and Engineering of Powder Metallurgy, 2021, 26(3): 189-201.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2021/V26/I3/189

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