Diffusion and atomic mobility of high temperature BCC phase in Ti-Al-Cr system
WU Chenjian1, BAI Weimin2, GAO Ning1, LIU Libin1, ZHANG Ligang1
1. School of Materials Science and Engineering, Central South University, Changsha 410083, China; 2. School of Materials Science and Engineering, Xiangtan University, Xiangtan 411105, China
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.
吴晨剑, 白伟民, 高宁, 刘立斌, 章立钢. Ti-Al-Cr体系高温BCC相扩散及原子移动性[J]. 粉末冶金材料科学与工程, 2021, 26(3): 189-201.
WU Chenjian, BAI Weimin, GAO Ning, LIU Libin, ZHANG Ligang. Diffusion and atomic mobility of high temperature BCC phase in Ti-Al-Cr system. Materials Science and Engineering of Powder Metallurgy, 2021, 26(3): 189-201.
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2021, Vol. 26 
