| METALS AND METAL MARTIX COMPOSITES |
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| Thermodynamics and Dynamics Analysis on the Elimination of the Peritecticα Phase in a High Nb Containing TiAl Alloy |
| WANG Yifei, GAO Dongqiang, TIAN Pujian, REN Wei, LIU Yanhui, SONG Wenjie, YANG Yanling,YANG Guang
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| College of Mechanical and Electrical Engineering, Shaanxi University of Science and Technology, Xian 710021 |
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Abstract In this work, a heat treatment in single β region was utilized to remove the peritectic α phase (αp) in a high Nb containing TiAl alloy and the relationships among treatment temperature, annealing time and peritectic α phase were analyzed from the aspect of thermodynamics and dynamics. The results showed that the as-cast high Nb containing TiAl alloys exhibited a significant solidification segregation, resulting in the formation of peritectic α phase, and the αp phase was eliminated by a heat treatment in single β region, i.e., 1 520 ℃ for 20 min. These phenomena were attributed to the instability of peritectic α phase and interdiffusion of Al and Nb elements in local regions. The thermodynamic instability led to the occurrence of αp→β transformation. The Al concentration in interdendritic regions decreased exponentially with annealing time. After the heat treatment at 1 520 ℃ for 20 min, the peritectic α phase was completely removed.The alloy undergoes a phase transition in the β solidification path, and a uniform and fine near-lamellar structure is obtained.
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Published: 31 May 2019
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| Fund:This work was financially supported by the National Natural Science Foundation of China (51701107,51464020) and the Natural Science Basic Research Plan in Shaanxi Province of China (2018JQ5161). |
| About author:: Yifei Wangobtained his B.E. degree from Shaanxi University of Science and Technology in June 2018. Now studying at Shaanxi University of Science & Technology, a graduate student of Mechanical and Electrical Engineering College, mainly engaged in phase transition behavior of TiAl alloy.Guang Yangobtained his B.E. degree from Sichuan University in 2009 and Ph.D. degree from Northwestern Polytechnical University in 2016. Until now, he works in the College of Mechanical and Electrical Enginee-ring, Shaanxi University of Science and Technology (SUST). He is currently an associate professor and supervisor of master student. He has published more than 30 journal papers, applied 7 national invention patents and 3 of them were authorized. In addition, he hosted a number of scientific research projects,including the National Natural Science Foundation of China and the Natural Science Basic Research Plan in Shaanxi Province of China. His research interests focus on the microstructure evolution and control of light metal, and the deformation behavior and microstructural characterization of metals and so on. |
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2019, Vol. 33 
