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Philosophical Magazine Letters Volume 94, 2014 - Issue 6
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Articles

Irradiation-enhanced twin boundary migration in BCC Fe

Dingkun SongState Key Laboratory for Turbulence and Complex System, Department of Mechanics and Engineering Science, College of Engineering, Peking University, Beijing, P.R. China
,
Xiaoguai LiState Key Laboratory for Turbulence and Complex System, Department of Mechanics and Engineering Science, College of Engineering, Peking University, Beijing, P.R. China
,
Jianming XueState Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing100871, P.R. China;Key Laboratory of High Energy Density Physics Simulation (HEDPS), CAPT, Peking University, Beijing100871, P.R. ChinaCorrespondence[email protected]
,
Huiling DuanState Key Laboratory for Turbulence and Complex System, Department of Mechanics and Engineering Science, College of Engineering, Peking University, Beijing, P.R. China;Key Laboratory of High Energy Density Physics Simulation (HEDPS), CAPT, Peking University, Beijing100871, P.R. ChinaCorrespondence[email protected]
&
Zhaohui JinSchool of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai200240, P.R. China
Pages 361-369 | Received 10 Oct 2013, Accepted 01 Apr 2014, Published online: 25 Apr 2014
 
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Abstract

The effects of irradiation on twin boundary migration in BCC Fe are studied by atomistic simulations. It is found that under the applied shear strain–stress, thermal spikes may create twinning dislocation loops (TDLs) at twin boundaries, so triggering twinning. Irradiation-generated clusters of point defect at twin boundaries may act as sources to nucleate TDLs. When a vacancy loop intersects with a twin boundary, the critical stress to activate a TDL is less than half of that required for a defect-free twin boundary.

Acknowledgements

Huiling Duan would like to acknowledge the Alexander von Humboldt (AvH) foundation in Germany for supporting this work through project “Mechanics theory of materials with complex surfaces and its applications” in the frame of the AvH programme for funding a research group linkage.

Funding

Support by the following agencies and programme is acknowledged: the Major State Basic Research Development Programme of China [grant numbers 2011CB013101 and 2012CB932202]; the National Natural Science Foundation of China [grant numbers 10872003, 10932001 and 11172001].

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