Features of Deformation in Crystals of Indium in a Wide Range of Temperatures

M. D. Raransky, А. V. Oliynych-Lysyuk, R. Yu. Tashchuk, O. V. Lysyuk, O. Yu. Tashchuk

Yuriy Fedkovych Chernivtsi National University, 2 Kotsyubynsky Str., UA-58012 Chernivtsi, Ukraine

The paper presents the results of the study of the spatial–temperature distribution of the Young’s modules ($E$), the components of Poisson’s-coefficient tensor, the coefficients of thermal expansion, stress fields and elastic displacements around edge and screw dislocations in indium in a wide temperature range (from cryogenic temperatures to melting one). The satisfactory correlation between the spatial–temperature dependences of the Poisson’s coefficients and the coefficients of thermal expansion between each other and the characteristic surfaces of the Young’s modulus is revealed that can be explained by their high sensitivity to the smallest changes in the phonon spectrum of this metal at different temperatures and in different crystallographic directions. By visualizing the spatial distribution of both the components of tensor of mechanical stresses and the displacement vector around the dislocations, it is shown that the defects of the crystalline structure in the ‘normal’ and ‘auxetic’ indium have different mechanical characteristics, which differ in both magnitude and direction in the crystal, and are able to initiate different behaviour of the same defects in external temperature–force fields that is especially important to take into account when predicting the mechanical properties of small-size objects (films, microcontacts, nanocrystals) based on this metal.

Key words: Poisson’s coefficients, temperature–spatial distribution, dislocations, indium.

URL: http://mfint.imp.kiev.ua/en/abstract/v40/i11/1453.html

DOI: https://doi.org/10.15407/mfint.40.11.1453

PACS: 61.72.Hh, 61.72.Lk, 62.20.de, 62.20.dj, 62.40.i, 65.40.De, 81.40.Jj

Citation: M. D. Raransky, А. V. Oliynych-Lysyuk, R. Yu. Tashchuk, O. V. Lysyuk, and O. Yu. Tashchuk, Features of Deformation in Crystals of Indium in a Wide Range of Temperatures, Metallofiz. Noveishie Tekhnol., 40, No. 11: 1453—1463 (2018) (in Ukrainian)

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