| Molecular dynamics simulation of fracture behaviors of 〈110〉 tilt grain boundaries in γ-TiAl | |
| Alternative Title | Molecular dynamics simulation of fracture behaviors of 〈110〉 tilt grain boundaries in γ-TiAl |
| Zhao Wenjuan1; Xu Dongsheng2; Zhao Jingwei3; Wang Hao2 | |
| 2014 | |
| Source Publication | Transactions of Nonferrous Metals Society of China
 |
| ISSN | 1003-6326 |
| Volume | 24Issue:11Pages:3645-3651 |
| Abstract | 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. |
| Other Abstract | 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. |
| Keyword | γ-TiAl合金 倾斜晶界 分子动力学 拉伸变形 断裂 |
| Indexed By | CSCD |
| Language | 英语 |
| CSCD ID | CSCD:5317058 |
| Citation statistics |
Cited Times:1[CSCD]
[CSCD Record]
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| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/143667 |
| Collection | 中国科学院金属研究所 |
| Affiliation | 1.湘潭大学 2.中国科学院金属研究所 3.卧龙岗大学 |
| Recommended Citation 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. |
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