Twin boundary and grain boundary effects on cyclic responses of tensile pre-deformed highly oriented nanotwinned Cu: Molecular dynamics simulation |
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| Institution: | 1. College of Aerospace and Civil Engineering, Harbin Engineering University, Harbin, 150001, China;2. College of Materials and Textile Engineering, Jiaxing University, Jiaxing, 314000, China;3. Key Laboratory of Advanced Material of Ship and Mechanics, Ministry of Industry and Information Technology, Harbin Engineering University, Harbin, 150001, China |
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| Abstract: | Molecular dynamics method is performed for analyzing the relationship of the twin boundary and grain boundary on the cyclic response of nanotwinned Cu. Results show that the strength difference among the grain boundary, the twin boundary and the variation of dislocation density are nearly 2-2.5 times. We predict twin boundary is only a factor that affects the stable response, however, the dislocation form and the time to reach stability is caused by the grain boundary. Furthermore, the phenomenon of cyclic hardening is found in all the nanotwinned Cu samples. |
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| Keywords: | Twin boundary Grain boundary Cyclic response Nanotwinned Cu Molecular dynamics simulation |
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