Effects of cooling rate on borides morphology and structure in cast β-solidifying γ-TiAl alloy

doi:10.1016/j.jallcom.2023.172872

IMR OpenIR

	Effects of cooling rate on borides morphology and structure in cast β-solidifying γ-TiAl alloy
	Liu, Renci 1,2; Wang, Xi 1,2; Cao, Ruxin 1,2; Zhou, Yangtao 1,2; Cui, Yuyou 1,2; Yang, Rui 1,2
通讯作者	Liu, Renci(rcliu@imr.ac.cn)
	2024-02-05
发表期刊	JOURNAL OF ALLOYS AND COMPOUNDS
ISSN	0925-8388
卷号	973 页码:9
摘要	Borides have been found to play a significant role in determining the mechanical properties of cast TiAl alloys. In order to investigate the influence of cooling rate on the morphology and structure of borides, SEM and HRTEM techniques were utilized to analyze borides in Ti-43Al-4 Nb-1Mo-0.5B (at%) cast plates with varying thicknesses. A higher cooling rate was observed to result in the formation of elongated, curvy borides with high aspect ratios, increased planar faults, and complex structures consisting of a combination of B2 phase and various boride phases. Conversely, a slower cooling rate yielded shorter bar-shaped borides with fewer planar faults. This variation in boride morphology can be attributed to the differing thicknesses of the solute-rich layer, where the eutectic reaction occurs, at the solidification front during fast and slow cooling processes. The B-f-TiB with a habit plane of (010) was identified as the dominant phase at all cooling rates. Borides in the [100] and [001] directions demonstrated a faster growth rate compared to those in the [010] direction. Additionally, HRTEM results indicated the presence of TiB2 while Ti3B4 was absent. This can be explained by the limited phase region of Ti3B4 in both the binary Ti-B and ternary Ti-Al-B phase diagrams, which is the smallest among all phases. These findings enhance the understanding of how cooling rate influences the morphology and structure of borides in TiAl alloys, thus providing insights for optimizing alloy design and manufacturing processes.
关键词	gamma-TiAl Boride Microstructure Cast Cooling rate
资助者	CAS Project for Young Scientists in Basic Research ; Major Special Science and Technology Project of Yunnan Province ; National Major science and Technology Projects of China
DOI	10.1016/j.jallcom.2023.172872
收录类别	SCI
语种	英语
资助项目	CAS Project for Young Scientists in Basic Research[YSBR-025] ; Major Special Science and Technology Project of Yunnan Province[202302AB080009] ; National Major science and Technology Projects of China[J2019-VII-0002-0142]
WOS研究方向	Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Chemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:001126710700001
出版者	ELSEVIER SCIENCE SA
引用统计	被引频次：5[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/183041
专题	中国科学院金属研究所
通讯作者	Liu, Renci
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Liu, Renci,Wang, Xi,Cao, Ruxin,et al. Effects of cooling rate on borides morphology and structure in cast β-solidifying γ-TiAl alloy[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2024,973:9.
APA	Liu, Renci,Wang, Xi,Cao, Ruxin,Zhou, Yangtao,Cui, Yuyou,&Yang, Rui.(2024).Effects of cooling rate on borides morphology and structure in cast β-solidifying γ-TiAl alloy.JOURNAL OF ALLOYS AND COMPOUNDS,973,9.
MLA	Liu, Renci,et al."Effects of cooling rate on borides morphology and structure in cast β-solidifying γ-TiAl alloy".JOURNAL OF ALLOYS AND COMPOUNDS 973(2024):9.