Effects of ?/? lamellar interfaces on translamellar crack propagation in TiAl alloys

doi:10.1016/j.jallcom.2022.165616

CORC > 兰州理工大学 > 兰州理工大学 > 机电工程学院

	Effects of ?/? lamellar interfaces on translamellar crack propagation in TiAl alloys
	Fu, Rong 1,2; Rui, Zhiyuan 1,2; Feng, Ruicheng 1,2; Dong, Yun 1,2; Lv, Xin 1,2
刊名	JOURNAL OF ALLOYS AND COMPOUNDS
	2022-10-15
卷号	918
关键词	? ? lamellar interface Translamellar fracture TiAl alloys Molecular dynamics simulation
ISSN号	0925-8388
DOI	10.1016/j.jallcom.2022.165616
英文摘要	Lamellar interfaces and their structures play a significant role in the fracture behavior of fully lamellar (FL) TiAl alloys. However, the effects of different lamellar interfaces on crack tip behavior are not clear. To this end, the interaction between three types of gamma/gamma lamellar interfaces, which are termed by true-twin, rotational-order, and pseudo-twin interfaces, and a translamellar crack in FL-TiAl alloy have been investigated by molecular dynamics simulation. By analyzing the atomic structure evolution of crack propagation and the effects of interfaces on the crack growth rate, we found that the introduction of gamma/gamma lamellar interfaces enhanced the crack resistance of a crack model without interfaces. Furthermore, the resistances of the gamma/gamma lamellar interfaces against translamellar crack propagation are in the order of rotational-order > pseudo twin > true-twin. Specifically, crack growth is almost arrested at the rotational-order interface; the crack propagation nearly stops after crossing through the pseudo-twin interface; while the crack penetrates the true-twin interface and continues to propagate in adjacent lamellae. In addition, as crack resistance of the lamellar interface improves, the dislocation density in the corresponding model also increases. Among the three kinds of gamma/gamma lamellar interfaces, the true-twin interface effectively screens the stress field at the crack tip, whereas the pseudo-twin and rotational-order interfaces do not. (c) 2022 Published by Elsevier B.V.
WOS研究方向	Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	ELSEVIER SCIENCE SA
WOS记录号	WOS:000808540600003
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/158824]
专题	机电工程学院
作者单位	1.Lanzhou Univ Technol, Key Lab Digital Mfg Technol & Applicat, Minist Educ, Lanzhou, Peoples R China 2.Lanzhou Univ Technol, Sch Mech & Elect Engn, Lanzhou, Peoples R China;
推荐引用方式 GB/T 7714	Fu, Rong,Rui, Zhiyuan,Feng, Ruicheng,et al. Effects of ?/? lamellar interfaces on translamellar crack propagation in TiAl alloys[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2022,918.
APA	Fu, Rong,Rui, Zhiyuan,Feng, Ruicheng,Dong, Yun,&Lv, Xin.(2022).Effects of ?/? lamellar interfaces on translamellar crack propagation in TiAl alloys.JOURNAL OF ALLOYS AND COMPOUNDS,918.
MLA	Fu, Rong,et al."Effects of ?/? lamellar interfaces on translamellar crack propagation in TiAl alloys".JOURNAL OF ALLOYS AND COMPOUNDS 918(2022).