| METALS AND METAL MATRIX COMPOSITES |
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| Orientation Behavior of Borides in β-solidifying γ-TiAl Alloys and Its Effect on the Microstructure of the α Phase |
| YANG Guang, TIAN Pujian, GE Zhenghao, WANG Yifei, YANG Xiaoxiao, LIU Jie, LIU Yanhui, SONG Wenjie
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| College of Mechanical and Electrical Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China |
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Abstract In this work, hot deformation in the single β phase region was performed to modify the distribution state of the borides in Ti-40Al-8Nb-0.5B and Ti-40Al-8Nb-1B alloys (at%), respectively. Special attention was paid to the orientation behavior of borides and its effect on the microstructure of the α phase. The results showed that the distribution state of the borides in these two alloys was significantly influenced by the hot defor-mation and boron content. The borides distributed randomly in the undeformed samples of Ti-40Al-8Nb-0.5B and Ti-40Al-8Nb-1B alloys, whereas the borides in the deformed Ti-40Al-8Nb-0.5B alloys presented a [100] fiber texture and the borides showed randomly distributed orientations in the deformed Ti-40Al-8Nb-1B alloys. This phenomenon is attributed to the rigid rotation of the borides and the interactions between the adjacent borides. After the subsequent β→α transformation, the α phase in Ti-40Al-8Nb-0.5B alloys exhibited a <1120> and <1010> double-fiber texture, whereas the α phase distributed randomly in Ti-40Al-8Nb-1B alloys, which is resulted from the microstructure heredity among the β phase, α phase and borides. The present study provides a new insight for the control of lamellar structure orientation in β-solidifying γ-TiAl alloys.
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Published: 25 April 2020
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| Fund:This work was financially supported by the National Natural Science Foundation Youth Fund of China (51701107,51805308). |
About author:: Guang Yangobtained his B.E. 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 Engineering, 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 Pro-vince 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.
Pujian Tianreceived his B.E. degree in material forming and controlling engineering from the Xi’an Jiao Tong University (XJTU) and is currently an associate professor in Shaanxi University of Science and Techno-logy (SUST). He received his master's degree in material processing engineering from the SUST, and now is a PhD student in SUST. He has published more than 20 journal papers as the first author and edited 2 college teaching materials. He was responsible for completing 3 provincial and bureau-level research projects, and participated in 7 national level research projects. His research interests focus on fundamental theory & application for the preparation, property control & processing and forming technology of metals. |
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2020, Vol. 34 
