Molecular Dynamics Research of Crack Propagation of Single Crystal gamma-TiAl Alloy along the Different Crystalline Phases

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	Molecular Dynamics Research of Crack Propagation of Single Crystal gamma-TiAl Alloy along the Different Crystalline Phases
	Luo Dechun 1,2; Rui Zhiyuan 1,2; Fu Rong 1,2; Zhang Ling 3; Cao Hui 1,2; Yan Changfeng 1,2
刊名	RARE METAL MATERIALS AND ENGINEERING
	2017-12
卷号	46 期号:12 页码:3792-3798
关键词	gamma-TiAl alloy molecular dynamics crystallographic orientation crack propagation
ISSN号	1002-185X
英文摘要	The different crystallographic orientation extension of the prefabricated micro-crack in the process of uniaxial tension of the single crystal gamma-TiAl was investigated using molecular dynamics simulations. The different forms of mechanical behavior and extension were analyzed at the crystallographic orientation of [100], [110] and [111]. The results show that the micro crack stress value of the three crystallographic orientation is 5.766, 6.26, and 6.57 GPa, respectively and their strength is enhanced in turn. The micro crack of the [100] crystal orientation exhibits brittleness cleavage extension completely, and the stress is always focused on the crack tip and decreases with increasing time. The micro crack of the [110] crystal orientation exhibits brittleness cleavage extension in the early stage and passivation phenomenon appears due to atomic staggering and dislocation emission, subsequently the sub crack initiates whose plane is different from that of the main crack, the stress always concentrates on the crack tip and decreases with increasing time; the main crack and the sub crack connect to constitute the step touch fracture crack. The micro crack of the [111] crystal orientation extends for launching slip dislocation and producing twins, and presents the obvious orientation effect, so the strength of materials is enhanced; the stress is always focused on the crack tip and twinning planes and it decreases with loading; the micro crack extension has fully different characteristics in the different crystallographic orientations.
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
语种	中文
出版者	NORTHWEST INST NONFERROUS METAL RESEARCH
WOS记录号	WOS:000425203200034
状态	已发表
内容类型	期刊论文
源URL	[http://119.78.100.223/handle/2XXMBERH/32998]
专题	机电工程学院土木工程学院
通讯作者	Luo Dechun
作者单位	1.Lanzhou Univ Technol, Lanzhou 730050, Gansu, Peoples R China 2.Chinas Minist Educ, Digital Mfg Technol & Applicat Key Lab, Lanzhou 730050, Gansu, Peoples R China 3.Lanzhou Inst Technol, Lanzhou 730050, Gansu, Peoples R China
推荐引用方式 GB/T 7714	Luo Dechun,Rui Zhiyuan,Fu Rong,et al. Molecular Dynamics Research of Crack Propagation of Single Crystal gamma-TiAl Alloy along the Different Crystalline Phases[J]. RARE METAL MATERIALS AND ENGINEERING,2017,46(12):3792-3798.
APA	Luo Dechun,Rui Zhiyuan,Fu Rong,Zhang Ling,Cao Hui,&Yan Changfeng.(2017).Molecular Dynamics Research of Crack Propagation of Single Crystal gamma-TiAl Alloy along the Different Crystalline Phases.RARE METAL MATERIALS AND ENGINEERING,46(12),3792-3798.
MLA	Luo Dechun,et al."Molecular Dynamics Research of Crack Propagation of Single Crystal gamma-TiAl Alloy along the Different Crystalline Phases".RARE METAL MATERIALS AND ENGINEERING 46.12(2017):3792-3798.