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Transformations of grain boundary dislocation pile-ups in nano- and polycrystalline materials |
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| Affiliation: | 1. Center of Electron Microscopy and State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, PR. China;2. Department of Mechanical Engineering, University of Manitoba, Winnipeg, MB R3T 5V6, Canada;3. School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, Sydney, NSW 2006, Australia;4. School of Materials Science & Engineering, Henan University of Science and Technology, Luoyang 471023, China;5. Department of Mechanical Engineering and Materials Science, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, USA |
| Abstract: | A theoretical model is suggested which describes several types of transformations of grain boundary dislocation pile-ups at triple junctions of grain boundaries in (super) plastically deformed nanocrystalline and polycrystalline materials. Ranges of parameters of defect configurations are revealed at which the transformations considered are energetically favourable. The role of transformations of grain boundary dislocation pile-ups at triple junctions of grain boundaries in plastic deformation processes in nanocrystalline and polycrystalline materials is discussed with special attention being paid to the influence of such transformations on competition between different deformation mechanisms in nanocrystalline materials. |
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