Molecular dynamics simulation of fracture behaviors of 〈110〉 tilt grain boundaries in γ-TiAl

IMR OpenIR

	Molecular dynamics simulation of fracture behaviors of 〈110〉 tilt grain boundaries in γ-TiAl
其他题名	Molecular dynamics simulation of fracture behaviors of 〈110〉 tilt grain boundaries in γ-TiAl
	Zhao Wenjuan 1; Xu Dongsheng 2; Zhao Jingwei 3; Wang Hao 2
	2014
发表期刊	Transactions of Nonferrous Metals Society of China
ISSN	1003-6326
卷号	24 期号:11 页码:3645-3651
摘要	Molecular dynamics (MD) simulations were carried out to study the fracture behaviors of several symmetric tilt grain boundaries in γ-TiAl bicrystals with 〈110〉 misorientation axes. Tensile deformation along direction perpendicular to grain boundary was simulated under various strain rates and temperatures. The results indicate that the relative orientation of the grains and the presence of certain atom units are two critical factors of the interface structure affecting the stress required for dislocation nucleation. Dislocations nucleate and extend at or near the symmetric tilt grain boundaries during the tensile deformation of Σ3 (111) 109.5°, Σ9 (221) 141.1° and Σ27 (552) 148.4° interfaces. For Σ27 (115) 31.6° and Σ11 (113) 50.5° interfaces, the interfaces fractured directly in a cleavage manner due to no dislocation emitted from the boundary. The tensile fracture mechanisms of the bicrystals are that micro-cracks nucleate at the grain boundary and propagate along the interface. The variance of crack propagation is whether there is accommodation of plastic region at the crack tips.
其他摘要	Molecular dynamics (MD) simulations were carried out to study the fracture behaviors of several symmetric tilt grain boundaries in γ-TiAl bicrystals with 〈110〉 misorientation axes. Tensile deformation along direction perpendicular to grain boundary was simulated under various strain rates and temperatures. The results indicate that the relative orientation of the grains and the presence of certain atom units are two critical factors of the interface structure affecting the stress required for dislocation nucleation. Dislocations nucleate and extend at or near the symmetric tilt grain boundaries during the tensile deformation of Σ3 (111) 109.5°, Σ9 (221) 141.1° and Σ27 (552) 148.4° interfaces. For Σ27 (115) 31.6° and Σ11 (113) 50.5° interfaces, the interfaces fractured directly in a cleavage manner due to no dislocation emitted from the boundary. The tensile fracture mechanisms of the bicrystals are that micro-cracks nucleate at the grain boundary and propagate along the interface. The variance of crack propagation is whether there is accommodation of plastic region at the crack tips.
关键词	γ-TiAl合金倾斜晶界分子动力学拉伸变形断裂
收录类别	CSCD
语种	英语
CSCD记录号	CSCD:5317058
引用统计	被引频次：1[CSCD] [CSCD记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/143667
专题	中国科学院金属研究所
作者单位	1.湘潭大学 2.中国科学院金属研究所 3.卧龙岗大学
推荐引用方式 GB/T 7714	Zhao Wenjuan,Xu Dongsheng,Zhao Jingwei,等. Molecular dynamics simulation of fracture behaviors of 〈110〉 tilt grain boundaries in γ-TiAl[J]. Transactions of Nonferrous Metals Society of China,2014,24(11):3645-3651.
APA	Zhao Wenjuan,Xu Dongsheng,Zhao Jingwei,&Wang Hao.(2014).Molecular dynamics simulation of fracture behaviors of 〈110〉 tilt grain boundaries in γ-TiAl.Transactions of Nonferrous Metals Society of China,24(11),3645-3651.
MLA	Zhao Wenjuan,et al."Molecular dynamics simulation of fracture behaviors of 〈110〉 tilt grain boundaries in γ-TiAl".Transactions of Nonferrous Metals Society of China 24.11(2014):3645-3651.