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Internal Friction of Bend-Deformed Nanocrystalline Nickel by Mechanical Spectroscopy |
| LI Ping-Yun1, ZHANG Xi-Yan2, WU Xiao-Lei3, HUANG Yi-Neng1, MENG Xiang-Kang1 |
| 1National Laboratory of Solid State Microstructures, Department of Materials Science and Engineering, Department of Physics, Nanjing University, Nanjing 2100932School of Materials Science and Engineering, Chongqing University, Chongqing 4000303State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Science, Beijing 100190 |
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LI Ping-Yun, ZHANG Xi-Yan, WU Xiao-Lei et al 2008 Chin. Phys. Lett. 25 4339-4341 |
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Abstract Internal friction of nanocrystalline nickel is investigated by mechanical spectroscopy from 360 K to 120 K. Two relaxation peaks are found when nanocrystalline nickel is bent up to 10% strain at room temperature and fast cooling. However, these two peaks disappear when the sample is annealed at room temperature in vacuum for ten days. The occurrence and disappearance of the two relaxation peaks can be explained by the interactions of partial dislocations and point defects in nanocrystalline materials.
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61.46.Hk
81.40.Jj
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Received: 03 July 2008
Published: 27 November 2008
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