Hierarchical microstructure in high Nb-containing TiAl alloy

doi:10.1016/j.matchar.2020.110767

CORC > 金属研究所 > 中国科学院金属研究所

	Hierarchical microstructure in high Nb-containing TiAl alloy
	He, Neng 4,5; Quan, Maohua 1; Lin, Junpin 2; He, Lianlong 4,5; Hu, Changyi 3
刊名	MATERIALS CHARACTERIZATION
	2021
卷号	171 页码:8
关键词	TiAl alloy Precipitates Orientation relationship Terrace-disconnection Hierarchical microstructure Phase separation
ISSN号	1044-5803
DOI	10.1016/j.matchar.2020.110767
通讯作者	He, Lianlong(llhe@imr.ac.cn) ; Hu, Changyi(hcy@ipm.com.cn)
英文摘要	Plate-like eta-Nb(Ti,Al)(3) precipitates with hierarchical microstructure comprised of alternating arrangement of gamma-(Ti,Nb)Al and eta plates in the Ti-55Al-22Nb alloy have been investigated using transmission electron microscopy. In addition, the orientation relationship (OR) between eta precipitates and gamma matrix is determined to be tetragonal-tetragonal. The habit plane of eta precipitates is along {022) crystal planes of gamma matrix. And the interface structure between them can be described using the classical 'terrace-disconnection' theory. Furthermore, the phenomenon of phase separation responsible for the formation of this hierarchical microstructure can be well explained by the chemical free energy, that is, Al-depletion and Ti-enrichment in eta precipitate drive the splitting of eta precipitate. To the authors' knowledge, this is the first work which demonstrates such a hierarchical microstructure in eta precipitate in high Nb-containing TiAl alloy.
资助项目	State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals, China[SKL-SPM-201805] ; National Natural Science Foundation of China[51831001]
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	ELSEVIER SCIENCE INC
WOS记录号	WOS:000616010200002
资助机构	State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals, China ; National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/160605]
专题	金属研究所_中国科学院金属研究所
通讯作者	He, Lianlong; Hu, Changyi
作者单位	1.Univ Sci & Technol Beijing, Inst Adv Mat & Technol, Beijing 10083, Peoples R China 2.Univ Sci & Technol Beijing, State Key Lab Adv Met & Mat, Beijing 10083, Peoples R China 3.Kunming Inst Precious Met, State Key Lab Adv Technol Comprehens Utilizat Pla, Kunming 650106, Yunnan, Peoples R China 4.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China 5.Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	He, Neng,Quan, Maohua,Lin, Junpin,et al. Hierarchical microstructure in high Nb-containing TiAl alloy[J]. MATERIALS CHARACTERIZATION,2021,171:8.
APA	He, Neng,Quan, Maohua,Lin, Junpin,He, Lianlong,&Hu, Changyi.(2021).Hierarchical microstructure in high Nb-containing TiAl alloy.MATERIALS CHARACTERIZATION,171,8.
MLA	He, Neng,et al."Hierarchical microstructure in high Nb-containing TiAl alloy".MATERIALS CHARACTERIZATION 171(2021):8.