Orientation Behavior of Borides in β-solidifying γ-TiAl Alloys and Its Effect on the Microstructure of the α Phase

被引：0

作者：

Yang G. ^{[1
]}

Tian P. ^{[1
]}

Ge Z. ^{[1
]}

Wang Y. ^{[1
]}

Yang X. ^{[1
]}

Liu J. ^{[1
]}

Liu Y. ^{[1
]}

Song W. ^{[1
]}

机构：

[1] College of Mechanical and Electrical Engineering, Shaanxi University of Science and Technology, Xi'an

来源：

Yang, Guang (yangguang@sust.edu.cn) | 2020年 / Cailiao Daobaoshe/ Materials Review卷 / 34期

基金：

中国国家自然科学基金;

关键词：

Borides; Orientation behavior; Α; phase; Β-solidifying γ-TiAl alloys;

D O I：

10.11896/cldb.19030177

中图分类号：

学科分类号：

摘要：

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. © 2020, Materials Review Magazine. All right reserved.

引用

页码：08113 / 08118

页数：5

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