Deformation mechanisms in nanotwinned γ-TiAl by molecular dynamics simulation

doi:10.1080/08927022.2018.1496248

CORC > 兰州理工大学 > 兰州理工大学 > 机电工程学院

	Deformation mechanisms in nanotwinned γ-TiAl by molecular dynamics simulation
	Hui, Cao 1,2; Zhiyuan, Rui 1,2; Wenke, Chen 1; Ruicheng, Feng 1,2; Changfeng, Yan 1,2
刊名	Molecular Simulation
	2018-12-12
卷号	44 期号:18 页码:1489-1500
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
ISSN号	08927022
DOI	10.1080/08927022.2018.1496248
英文摘要	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.
WOS研究方向	Chemistry ; Physics
语种	英语
出版者	Taylor and Francis Ltd.
WOS记录号	WOS:000447307400001
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/114173]
专题	机电工程学院兰州理工大学
作者单位	1.School of Mechanical and Electronic Engineering, Lanzhou University of Technology, Lanzhou, China; 2.Key Laboratory of Digital Manufacturing Technology and Application, The Ministry of Education, Lanzhou University of Technology, Lanzhou, China
推荐引用方式 GB/T 7714	Hui, Cao,Zhiyuan, Rui,Wenke, Chen,et al. Deformation mechanisms in nanotwinned γ-TiAl by molecular dynamics simulation[J]. Molecular Simulation,2018,44(18):1489-1500.
APA	Hui, Cao,Zhiyuan, Rui,Wenke, Chen,Ruicheng, Feng,&Changfeng, Yan.(2018).Deformation mechanisms in nanotwinned γ-TiAl by molecular dynamics simulation.Molecular Simulation,44(18),1489-1500.
MLA	Hui, Cao,et al."Deformation mechanisms in nanotwinned γ-TiAl by molecular dynamics simulation".Molecular Simulation 44.18(2018):1489-1500.