Low Temperature Physics: 42, 138 (2016); https://doi.org/10.1063/1.4942907
Fizika Nizkikh Temperatur: Volume 42, Number 2 (February 2016), p. 185-197    ( to contents , go back )

Dislocation mechanism of low-temperature internal friction in nanostructured materials

V.D. Natsik1,2 and Yu.A. Semerenko1

1B. Verkin Institute for Low Temperature Physics and Engineering National Academy of Sciences of Ukraine 47 Nauki Ave., Kharkiv, 61103, Ukraine
E-mail: semerenko@ilt.kharkov.ua

2V.N. Karazin National University, Kharkov 61077, Ukraine
pos Анотація:

Received November 17, 2015

Abstract

The method of statistical description of the dislocation component of the low-temperature internal friction in nanostructured material has been developed. The resonant interaction of elastic oscillations with thermally activated excitations of relaxators has been considered. It is shown that at low temperatures the peak shape and its localization on the temperature axis is determined essentially by the dispersion of the activation energy of the relaxators. The algorithm of analysis of the experimental peaks of internal friction has been formulated. This algorithm allows the identification of physical model of the corresponding relaxators and enables to receive the empirical estimates for the parameters of oscillators.

PACS: 81.07.–b Nanoscale materials and structures: fabrication and characterization;
PACS: 61.46.–w Structure of nanoscale materials;
PACS: 62.40.+i Anelasticity, internal friction, stress relaxation, and mechanical resonances

Key words: internal friction, nanostructured material, dislocation mechanism, relaxator, activation energy.

Published online: December 23, 2015

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