Effects of orientation and twin boundary spacing on the mechanical behaviour of gamma-TiAl alloy

doi:10.1080/08927022.2021.2007910

CORC > 兰州理工大学 > 兰州理工大学 > 土木工程学院

	Effects of orientation and twin boundary spacing on the mechanical behaviour of gamma-TiAl alloy
	Cao, Hui 1,2; Chen, Wenke 1; Rui, Zhiyuan 1,2; Yan, Changfeng 1,2
刊名	MOLECULAR SIMULATION
	2022-02-11
卷号	48 期号:3 页码:231-246
关键词	Orientation twin boundary spacing mechanical behaviour gamma-TiAl alloy shear
ISSN号	0892-7022
DOI	10.1080/08927022.2021.2007910
英文摘要	gamma-TiAl alloy is a promising structural material applied in the aerospace and automotive industries. However, its mechanical behaviour is still not well characterised at the atomic scale. In this work, the roles of orientation and twin boundary (TB) spacing on the mechanical properties and deformation behaviours of gamma-TiAl alloy are investigated by molecular dynamics simulation with embedded-atom potential under shear loading. The simulation results reveal that the shear modulus is the largest when shearing along [100] and smallest along [01 (1) over bar] orientation. The yield stress is the highest of [100] and lowest of [11 (2) over bar] orientation. The deformation mechanism and the strain hardening effect differ with orientations. Moreover, it is found that TB migration perpendicular to the loading direction is good at strengthening gamma-TiAl alloy. Specifically, 3.79 nm is the critical spacing corresponding to the maximum stress, average peak stress, stress relaxation and the largest strain hardening factor. The shear modulus and yield stress are independent of the TB spacing. The study shows that 3.32 nm is the critical spacing for the TB to annihilate. More importantly, TB migration is the main deformation mechanism at first. Then, it is controlled by the interaction between dislocation-dislocation and dislocation-TB at different TB spacings.
WOS研究方向	Chemistry ; Physics
语种	英语
出版者	TAYLOR & FRANCIS LTD
WOS记录号	WOS:000725964200001
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/154977]
专题	土木工程学院机电工程学院
作者单位	1.Lanzhou Univ Technol, Sch Mech & Elect Engn, Lanzhou, Peoples R China; 2.Lanzhou Univ Technol, Key Lab Digital Mfg Technol & Applicat, Minist Educ, Lanzhou, Peoples R China
推荐引用方式 GB/T 7714	Cao, Hui,Chen, Wenke,Rui, Zhiyuan,et al. Effects of orientation and twin boundary spacing on the mechanical behaviour of gamma-TiAl alloy[J]. MOLECULAR SIMULATION,2022,48(3):231-246.
APA	Cao, Hui,Chen, Wenke,Rui, Zhiyuan,&Yan, Changfeng.(2022).Effects of orientation and twin boundary spacing on the mechanical behaviour of gamma-TiAl alloy.MOLECULAR SIMULATION,48(3),231-246.
MLA	Cao, Hui,et al."Effects of orientation and twin boundary spacing on the mechanical behaviour of gamma-TiAl alloy".MOLECULAR SIMULATION 48.3(2022):231-246.