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

doi:10.1016/j.commatsci.2021.110428

IR > 机电工程学院

	Effects of gamma/gamma lamellar interfaces on interlamellar crack propagation behaviors of TiAl alloys
	Fu, Rong 1,2; Rui, Zhiyuan1,2 ; Dong, Yun1,2 ; Luo, Dechun1,2 ; Yan, Changfeng1,2
	2021
发表期刊	COMPUTATIONAL MATERIALS SCIENCE
ISSN	0927-0256
卷号	194
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.
关键词	gamma/gamma lamellar interface Interlamellar crack TiAl alloys Molecular dynamics simulation
DOI	10.1016/j.commatsci.2021.110428
收录类别	SCIE ; SCOPUS ; EI
语种	英语
WOS研究方向	Materials Science
WOS类目	Materials Science, Multidisciplinary
WOS记录号	WOS:000649552700002
出版者	ELSEVIER
引用统计	被引频次：8[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	https://ir.lut.edu.cn/handle/2XXMBERH/148189
专题	机电工程学院
作者单位	1.Lanzhou Univ Technol, Sch Mech & Elect Engn, Lanzhou, Peoples R China; 2.Lanzhou Univ Technol, Minist Educ, Key Lab Digital Mfg Technol & Applicat, Lanzhou, Peoples R China
第一作者单位	兰州理工大学
第一作者的第一单位	兰州理工大学
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).