Low Temperature Physics: 26, 522 (2000); https://doi.org/10.1063/1.1306411 (7 pages)
Fizika Nizkikh Temperatur: Volume 26, Number 7 (July 2000), p. 711-720    ( to contents , go back )

Statistical analysis of the low-temperature internal friction a-peak in iron single crystals

V. D. Natsik, P. P. Pal-Val, L. N. Pal-Val, Yu. A. Semerenko

B. Verkin Institute for Low Temperature Physics and Engineering, National Academy of Sciences of Ukraine, 47 Lenin ave., Kharkov 310164, Ukraine
E-mail: palval@ilt.kharkov.ua

Received Janyary 31, 2000

Abstract

The pure iron single crystals are studied to establish the influence of changes in sample dislocation structure and ultrasonic frequency on the parameters of the low-temperature a-peak of internal friction and the related Young`s modulus defect. A statistical interpretation of the temperature dependences and the structure sensitivity of the dynamic relaxation characteristics in the vicinity of the a-peak is proposed. It is based on the assumption of random scatter of the activation energies of elementary relaxators. Empirical estimations for the attack period, average value and dispersion of the activation energy of the process responsible for the internal friction a-peak in iron are obtained.

PACS:
61.70.Le -
62.40.+i - Anelasticity, internal friction, stress relaxation, and mechanical resonances (see also 81.40.Jj Elasticity and anelasticity in materials science)
62.80.+f - Ultrasonic relaxation (see also 43.35.Fj Ultrasonic relaxation processes in liquids and solids�in acoustics appendix; for ultrasonic attenuation in superconductors, see 74.25.Ld)

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