Mechanical Spectroscopy of Nanocrystalline Metals and Nanometer-Thick Films: Characteristic Properties Originated in Nanostructures

Abstract:

Nanocrystalline (n-) Au shows a large internal friction accompanied with the modulus defects above ~200 K. After the creep test, the strong <111> preferred texture changed to rather random one but the mean grain size was unchanged. In situ STM observation indicated that the crystallites can independently move during the creep deformation. Quasi-two phase state composed of solid crystallites and anelastic/viscoelastic grain boundaries (GBs) is proposed to explain these characteristic mechanical properties of n-Au. Further, GBs show the glass-transition-like change at around 200 K, anelastic/viscoelastic transition at ~30 MPa and dynamical state change above ~200 MPa. The high vacancy-type-defect concentration plays an important role on stabilization of the quasi-two phase state in n-Au.

• Periodical: Solid State Phenomena (Volume 184)
• Pages: 42-51
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.184.42
• Online since: January 2012
• Authors: Hisanori Tanimoto
• Keywords: Grain Boundary, Grain Boundary Sliding (GBS), Nanocrystalline Metal, Phase Transition, Quasi-Two Phase State, Vacancy-Type Defect

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