| CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
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Deformation Induced Internal Friction Peaks in Nanocrystalline Nickel |
| LI Ping-Yun1, ZHANG Xi-Yan2, NI Hai-Tao 2, CAO Zhen-Hua1, MENG Xiang-Kang1** |
1Department of Materials Science and Engineering, National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093
2School of Materials Science and Engineering, Chongqing University, Chongqing 400030
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ZHANG Xi-Yan, NI Hai-Tao, MENG Xiang-Kang et al 2012 Chin. Phys. Lett. 29 026201 |
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Abstract We report the mechanical spectroscopy study of the cold-rolling induced dynamical behavior of crystalline defects in nanocrystalline (NC) nickel. The results show that internal friction (IF) peaks in NC nickel can be induced by cold-rolling. An IF peak, originating from dislocation activity, occurs when the strain is in the range of 9.7–32.8%. Two Bordoni peaks occur when the strain is 39.0% and an IF peak associated with deformation twinning appears when the strain is 42.6%. These results mean that deformation of NC nickel is mediated by different kinds of defects as the strain increases.
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| Keywords:
62.40.+i
81.40.Lm
81.07.Bc
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Received: 28 November 2011
Published: 11 March 2012
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| PACS: |
62.40.+i
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(Anelasticity, internal friction, stress relaxation, and mechanical resonances)
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81.40.Lm
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(Deformation, plasticity, and creep)
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81.07.Bc
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(Nanocrystalline materials)
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