Effects of gamma/gamma lamellar interfaces on interlamellar crack propagation behaviors of TiAl alloys

doi:10.1016/j.commatsci.2021.110428

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	Effects of gamma/gamma lamellar interfaces on interlamellar crack propagation behaviors of TiAl alloys
	Fu, Rong 1,2; Rui, Zhiyuan 1,2; Dong, Yun 1,2; Luo, Dechun 1,2; Yan, Changfeng 1,2
刊名	COMPUTATIONAL MATERIALS SCIENCE
	2021
卷号	194
关键词	gamma/gamma lamellar interface Interlamellar crack TiAl alloys Molecular dynamics simulation
ISSN号	0927-0256
DOI	10.1016/j.commatsci.2021.110428
英文摘要	Interlamellar fracture is one of the failure modes of fully lamellar (FL) TiAl alloys. Here, the effects of three types of gamma/gamma lamellar interfaces, which are termed true twin (TT), 120 degrees rotational order fault (ROF), and pseudo-twin (PT), subjected to uniaxial tensile loading on the interlamellar crack propagation behaviors of an FL gamma-TiAl alloy have been investigated by molecular dynamics method. The results show that the introduction of the PT and ROF interface weakens the tensile strength of single crystal TiAl, while the introduction of the TT interface can effectively improve the tensile strength of the material. Moreover, the cracks in the three interfaces exhibit different propagation behaviors and propagation rates. Specifically, the ROF and PT interfaces exhibit the most desirable and least desirable crack resistances, respectively, which are related to the geometric compatibilities of the interfaces and plastic deformation of crack tips. We also found that the sequence of fracture toughness (ROF > TT > PT) is consistent with that of the flow stresses (ROF > TT > PT). In addition, in the early stage of crack propagation, deformation twins serve as a toughening mechanism that reduces crack tip stress and retards crack extension.
WOS研究方向	Materials Science
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000649552700002
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/148189]
专题	机电工程学院
作者单位	1.Lanzhou Univ Technol, Minist Educ, Key Lab Digital Mfg Technol & Applicat, 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,Dong, Yun,et al. Effects of gamma/gamma lamellar interfaces on interlamellar crack propagation behaviors of TiAl alloys[J]. COMPUTATIONAL MATERIALS SCIENCE,2021,194.
APA	Fu, Rong,Rui, Zhiyuan,Dong, Yun,Luo, Dechun,&Yan, Changfeng.(2021).Effects of gamma/gamma lamellar interfaces on interlamellar crack propagation behaviors of TiAl alloys.COMPUTATIONAL MATERIALS SCIENCE,194.
MLA	Fu, Rong,et al."Effects of gamma/gamma lamellar interfaces on interlamellar crack propagation behaviors of TiAl alloys".COMPUTATIONAL MATERIALS SCIENCE 194(2021).