Operative slip systems and anomalous strengthening in Ni3Nb single crystals with the D0a structure |
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| Affiliation: | 1. Institute of Physics of the Czech Academy of Sciences, Na Slovance 2, 182 21, Prague 6, Czechia;2. Department of Physics of Materials, Charles University in Prague, Ke Karlovu 5, 121 16, Prague 2, Czechia;3. Laboratoire de Cristallographie et Sciences des Matériaux, Normandie Université, ENSICAEN, UNICAEN, CNRS, UMR 6508, 6 Bd Maréchal Juin, F-14050, Caen, France;1. Materials Department, University of California Santa Barbara, Santa Barbara, CA 93106-5050, USA;2. Department of Metallurgy and Materials, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK;3. Center for Electron Microscopy Analysis, The Ohio State University, Columbus, OH 43210, USA;4. GE Global Research, Niskayuna, NY 12309, USA;1. College of Automotive and Mechanical Engineering, Changsha University of Science and Technology, Changsha 410114, China;2. School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China;3. School of Mechanical Engineering, Dongguan University of Technology, Dongguan 523808, China;1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, PR China;2. Department of Materials Engineering, Indian Institute of Science, Bangalore, 560012, India;3. National Key Laboratory of Science and Technology on Advanced High Temperature Structural Material, Beijing Institute of Aeronautical Material, Beijing, 100095, PR China;4. School of Materials Science and Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen, 518055, PR China |
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| Abstract: | The plastic deformation behavior of Ni3Nb single crystals was examined in tension and compression to determine the operative slip and twinning systems, and to explore the anomalous strengthening behavior. A strong temperature dependence of the CRSS for both the slip and twinning systems was observed, which was dependent on the sample orientation. Anomalous flow behavior was also observed in Ni3Nb crystals deformed by (010)100] and (001)100] slip. The anomalous strengthening mechanism is discussed on the basis of both the anisotropy of APB energy and the formation of dragging atmosphere around moving dislocations. |
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