Effects of γ/γ 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 γ/γ 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
	2021-06-15
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 γ/γ lamellar interfaces, which are termed true twin (TT), 120° rotational order fault (ROF), and pseudo-twin (PT), subjected to uniaxial tensile loading on the interlamellar crack propagation behaviors of an FL γ-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. © 2021 Elsevier B.V.
关键词	Aluminum alloys Binary alloys Crack propagation Crack tips Fracture toughness Single crystals Tensile strength Titanium alloys Twinning Crack propagation behavior Dynamics simulation Fully lamellar Fully lamellar TiAl alloy Interlamellar crack Lamellar interfaces TiAl alloy Twin interfaces Uniaxial tensile loading Γ/γ lamellar interface
DOI	10.1016/j.commatsci.2021.110428
收录类别	EI ; SCIE
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 B.V.
EI入藏号	20211310142729
EI主题词	Molecular dynamics
EI分类号	541.2 Aluminum Alloys ; 542.3 Titanium and Alloys ; 801.4 Physical Chemistry ; 933.1 Crystalline Solids ; 933.1.2 Crystal Growth ; 951 Materials Science
来源库	WOS
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/148455
专题	机电工程学院
通讯作者	Fu, Rong; Rui, Zhiyuan
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
通讯作者单位	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 γ/γ 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 γ/γ lamellar interfaces on interlamellar crack propagation behaviors of TiAl alloys.Computational Materials Science,194.
MLA	Fu, Rong,et al."Effects of γ/γ lamellar interfaces on interlamellar crack propagation behaviors of TiAl alloys".Computational Materials Science 194(2021).