Molecular dynamics simulations of void shrinkage in γ-TiAl single crystal

doi:10.1016/j.commatsci.2015.05.007

	Molecular dynamics simulations of void shrinkage in γ-TiAl single crystal
	Xu, Xiao-Ting; Tang, Fu-Ling; Xue, Hong-Tao; Yu, Wei-Yuan; Zhu, Liang; Rui, Zhi-Yuan
刊名	Computational Materials Science
	2015-06-03
卷号	107 页码:58-65
关键词	Dislocations (crystals) Molecular dynamics Shrinkage Single crystals Stacking faults Strain rate Compression directions Deformation mechanism Dislocation structures Molecular dynamics simulations Partial dislocations Specimen sizes Uni-axial compression Void volume fraction
ISSN号	09270256
DOI	10.1016/j.commatsci.2015.05.007
英文摘要	Abstract Molecular dynamics simulation was performed to study the shrinkage of spherical nano-void under uniaxial compression load in γ-TiAl single crystal. During the compression, the nano-void crystal undergoes elastic then plastic deformation process. In the elastic period, the nano-void shrinks linearly along compression direction while it expands linearly along the directions perpendicular to the compression direction. Finally, the nano-void collapses from all directions at the beginning of the plastic process. The formation and extension of dislocations and the shrinking mechanism of void were analyzed in detail. The dependence of the void shrinking on the specimen size, strain rate, and void volume fraction were also investigated. It is found that the stacking faults' slipping in the crystal during plastic period is the main deformation mechanism of the void shrinkage: dislocation structures initially start to nucleate around the equator area of the void, then partial dislocations and planar faults constantly propagate, finally the stacking faults and partial dislocations swap through the entire system and the void shrinks. © 2015 Elsevier B.V.
WOS研究方向	Materials Science
语种	英语
出版者	Elsevier B.V.
WOS记录号	WOS:000356964900009
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/112431]
专题	材料科学与工程学院兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室实验室建设与管理处
作者单位	State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Department of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou; 730050, China
推荐引用方式 GB/T 7714	Xu, Xiao-Ting,Tang, Fu-Ling,Xue, Hong-Tao,et al. Molecular dynamics simulations of void shrinkage in γ-TiAl single crystal[J]. Computational Materials Science,2015,107:58-65.
APA	Xu, Xiao-Ting,Tang, Fu-Ling,Xue, Hong-Tao,Yu, Wei-Yuan,Zhu, Liang,&Rui, Zhi-Yuan.(2015).Molecular dynamics simulations of void shrinkage in γ-TiAl single crystal.Computational Materials Science,107,58-65.
MLA	Xu, Xiao-Ting,et al."Molecular dynamics simulations of void shrinkage in γ-TiAl single crystal".Computational Materials Science 107(2015):58-65.