Deformation mechanisms in nanotwinned gamma-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 gamma-TiAl by molecular dynamics simulation
	Cao Hui 1,2; Rui Zhiyuan 1,2; Chen Wenke 1; Feng Ruicheng 1,2; Yan Changfeng 1,2
刊名	MOLECULAR SIMULATION
	2018-12-12
卷号	44 期号:18 页码:1489-1500
关键词	Nanotwinned gamma-TiAl molecular dynamics twin boundary dislocations plastic deformation
ISSN号	0892-7022
DOI	10.1080/08927022.2018.1496248
英文摘要	In this work, the plastic deformation mechanisms and fracture toughness of nanotwinned gamma-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 gamma-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 gamma-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 gamma-TiAl.
WOS研究方向	Chemistry ; Physics
语种	英语
出版者	TAYLOR & FRANCIS LTD
WOS记录号	WOS:000447307400001
状态	已发表
内容类型	期刊论文
源URL	[http://119.78.100.223/handle/2XXMBERH/32279]
专题	机电工程学院土木工程学院
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
推荐引用方式 GB/T 7714	Cao Hui,Rui Zhiyuan,Chen Wenke,et al. Deformation mechanisms in nanotwinned gamma-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 gamma-TiAl by molecular dynamics simulation.MOLECULAR SIMULATION,44(18),1489-1500.
MLA	Cao Hui,et al."Deformation mechanisms in nanotwinned gamma-TiAl by molecular dynamics simulation".MOLECULAR SIMULATION 44.18(2018):1489-1500.