Deformation mechanisms in nanotwinned γ-TiAl by molecular dynamics simulation

doi:10.1080/08927022.2018.1496248

IR > 土木工程学院

	Deformation mechanisms in nanotwinned γ-TiAl by molecular dynamics simulation
	Cao Hui1,2 ; Rui Zhiyuan1,2 ; Chen Wenke 1; Feng Ruicheng1,2 ; Yan Changfeng1,2
	2018-12-12
发表期刊	Molecular Simulation
ISSN	08927022
卷号	44 期号:18 页码:1489-1500
摘要	In this work, the plastic deformation mechanisms and fracture toughness of nanotwinned γ-TiAl with different twin boundary (TB) spacing are investigated by using molecular dynamics simulation. The simulation results reveal that there are pronounced shifts in the mechanical behaviour of nanotwinned γ-TiAl when the TB spacing is 3.50, 4.20 and 4.90 nm. In addition, the variation of the dislocation density with strain at these three TB spacing illustrates that a smaller TB spacing induces a higher dislocation density. Different TB spacing has an influence on the dislocation behaviour. The dislocation pile-up, dislocation–dislocation, dislocation–twin and twin–twin reactions, hierarchical twins including their generation and density, step formation, dislocation emission from steps and TB migration are the main plastic deformation mechanisms. The results also show that TB migration, twinning formation and interaction of crack and TB dominate the deformation mechanism of nanotwinned γ-TiAl with crack. The generation of hierarchical twins, lower distance between crack surface plane and twin plane, dislocation–twin, twin–twin interaction and crack deflection increase the fracture toughness of nanotwinned γ-TiAl. © 2018, © 2018 Informa UK Limited, trading as Taylor & Francis Group.
关键词	Cracks Dislocations (crystals) Fracture toughness Piles Plastic deformation Reaction kinetics Textures Deformation mechanism Dislocation densities Dislocation emissions Interaction of cracks Molecular dynamics simulations Nanotwinned Plastic deformation mechanisms Twin boundaries
DOI	10.1080/08927022.2018.1496248
收录类别	EI ; SCIE
语种	英语
WOS研究方向	Chemistry ; Physics
WOS类目	Chemistry, Physical ; Physics, Atomic, Molecular & Chemical
WOS记录号	WOS:000447307400001
出版者	Taylor and Francis Ltd.
EI入藏号	20183805831286
EI主题词	Molecular dynamics
EI分类号	408.2 Structural Members and Shapes - 801.4 Physical Chemistry - 802.2 Chemical Reactions
来源库	Compendex
分类代码	408.2 Structural Members and Shapes - 801.4 Physical Chemistry - 802.2 Chemical Reactions
引用统计	被引频次：12[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/114173
专题	土木工程学院机电工程学院
通讯作者	Rui Zhiyuan
作者单位	1.Lanzhou Univ Technol, Sch Mech & Elect Engn, Lanzhou, Gansu, Peoples R China; 2.Minist Educ, Key Lab Digital Mfg Technol & Applicat, Lanzhou, Gansu, 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	Cao Hui,Rui Zhiyuan,Chen Wenke,et al. Deformation mechanisms in nanotwinned γ-TiAl by molecular dynamics simulation[J]. Molecular Simulation,2018,44(18):1489-1500.
APA	Cao Hui,Rui Zhiyuan,Chen Wenke,Feng Ruicheng,&Yan Changfeng.(2018).Deformation mechanisms in nanotwinned γ-TiAl by molecular dynamics simulation.Molecular Simulation,44(18),1489-1500.
MLA	Cao Hui,et al."Deformation mechanisms in nanotwinned γ-TiAl by molecular dynamics simulation".Molecular Simulation 44.18(2018):1489-1500.