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Mechanical spectroscopy of nanocrystalline nickel near room temperature

Authors
Journal
Scripta Materialia
1359-6462
Publisher
Elsevier
Publication Date
Volume
59
Issue
4
Identifiers
DOI: 10.1016/j.scriptamat.2008.04.031
Keywords
  • Anelasticity
  • Damping
  • Internal Friction
  • Nanocrystalline Nickel

Abstract

In this study, the anelastic behavior of nanocrystalline nickel was investigated by mechanical spectroscopy. Test temperature ranged from room temperature to 415 K, and frequency from 235 to 2567 Hz, with two internal friction peaks observed. Peak temperature increased with increasing frequency, indicating a thermally activated damping process. The smaller peak yields an activation energy H = 0.70 eV. The peaks appear to be P β and P γ Hasiguti peaks, arising from damping due to dislocations and point defects.

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