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Phase Field Modeling of Formation Mechanism of Grain Boundary Allotriomorph in β→α Phase Transformation in Ti-6Al-4V Alloy |
SUN Jia1,2, LI Xuexiong1, ZHANG Jinhu1, WANG Gang3, YANG Mei4, WANG Hao1,5, XU Dongsheng1,5() |
1 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China 2 University of Chinese Academy of Sciences, Beijing 100049, China 3 School of Materials Science and Engineering, South China University of Technology, Guangzhou 510006, China 4 School of Materials Engineering, Jiangsu University of Technology, Changzhou 213001, China 5 School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China |
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Cite this article:
SUN Jia, LI Xuexiong, ZHANG Jinhu, WANG Gang, YANG Mei, WANG Hao, XU Dongsheng. Phase Field Modeling of Formation Mechanism of Grain Boundary Allotriomorph in β→α Phase Transformation in Ti-6Al-4V Alloy. Acta Metall Sin, 2020, 56(8): 1113-1122.
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Abstract The microstructure evolution with grain boundary wetting phase transformation of α allotriomorph during the β→α phase transformation in Ti-6Al-4V alloy has been investigated by means of phase field modeling. A realistic microstructure was generated by coupling the Thermo-Calc thermodynamic parameters and phase field evolution equations. It is shown that the specially constructed thermal noise terms disturb the β/β interfaces and can produce heterogeneous nucleation of α phase at energetically favorable points such as triple junctions and β grain boundaries (GBs). A small amount of αGB (grain boundary α) nuclei formed at the early stage of phase transition would lead to the formation of discontinuous αGB; while a large number of αGB nuclei can result in the formation of continuous αGB. GBs can be "wetted" by a second solid phase through the reversible transition from incomplete to complete solid state wetting at a certain temperature without a new reaction. The volume fraction of α phase and the grain number increased gradually as the noise amplitude increased from 0.05 to 0.11, or noise duration from 50 s to 80 s. Both noise amplitude and time could control the formation kinetics of αGB, which will influence the microstructure, and the fatigue properties of Ti alloys can be altered if these are controlled experimentally.
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Received: 18 November 2019
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Fund: National Key Research and Development Program of China(2016YFB0701304);Strategic Priority Research Program of Chinese Academy of Sciences(XDC01040100);Special Informatization Project of Chinese Academy of Sciences(XXH13506-304);National Natural Science Foundation of China(51671195) |
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