On the spreading of grain boundary dislocations and its effect on grain boundary properties |
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| Affiliation: | 1. State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China;2. Changjiang Survey, Planning, Design, and Research Co., Wuhan 430010, China;1. Dpto Física de la Materia Condensada, Facultad de Ciencia y Tecnología, Universidad del País Vasco, Aptdo 644, 48080 Bilbao, Spain;2. Instituto de Ciencia de Materiales, CSIC-Universidad de Sevilla, Avda. Américo Vespucio 49, 41092 Sevilla, Spain;3. Dpto Física aplicada II, Facultad de Ciencia y Tecnología, Universidad del País Vasco, Aptdo 644, 48080 Bilbao, Spain;4. Departamento de Física de la Materia Condensada, Facultad de Física, Universidad de Sevilla, Apartado 1065, 41012 Sevilla, Spain;1. Collaborative Innovation Center of Taiyuan Heavy Machinery Equipment, Taiyuan University of Science and Technology, Taiyuan 030024, China;2. School of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China;3. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi''an 710072, China;4. Northwest Institute for Nonferrous Metals Research, Xi''an 710076, China;1. Department of Hepatic Surgery VI, Eastern Hepatobiliary Surgery Hospital, Second Military Medical University, Shanghai, China;2. Department of General Surgery, Zhejiang Provincial Armed Police Corps Hospital, Hangzhou, China;3. Shengli Clinical Medical College of Fujian Medical University, Fuzhou, China;4. Department of Hepatobiliary Surgery, Fujian Provincial Hospital of Fujian Medical University, Fuzhou, China;5. Department of Hepatobiliary Surgery, West China Hospital of Sichuan University, Chengdu, China;6. Department of Hepatobiliary Surgery, Zhongshan Hospital of Xiamen University, Xiamen, China;7. Department of Hepatobiliary Surgery, The First Affiliated Hospital of Fujian Medical University, Fuzhou, China;1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China;2. Baoshan Iron & Steel Co., Ltd., Shanghai 200940, China |
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| Abstract: | The effect of dissociation of trapped lattice dislocations (TLDs) on the energy of grain boundaries (GBs) is calculated. Two possible effects are considered. The first is the change of energy of the GBs caused by the presence of TLDs cores. It was shown to be smaller than 5% of the grain boundary energy. The other, more important, is an increase of the energy of the strain fields connected with grain boundaries. Dissociation of TLDs causes an increase of incompatibility strains between plastically deformed grains. The energy of these strains is of the order the GB energy in equilibrium. The EGBDs strain fields provide a driving force for GB sliding and migration. In fact, EGBDs cannot leave the grain boundaries. Recovery of these dislocations can take place only by sliding and migration of grain boundaries. |
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