Evolution of Defect Subsystems During Microplastic Deformation of Auxetic Beryllium

O. Yu. Tashchuk, M. K. Myshylyuk, A. V. Oliynych-Lysyuk, M. D. Rarans’ky

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

Received: 17.09.2015. Download: PDF

In this article, the evolution of defect subsystems and the contribution of Poisson’s ratios in the process of microplastic deformation of auxetic beryllium with the change of temperature and strain amplitude are investigated by means of the method of low-frequency internal friction (LFIF). The velocities of defects in the beryllium are mathematically modelled in different temperature intervals, which include the auxetic and non-auxetic material states. The relations of motion rates of defects, $V/V_{0}$, parameters of slowing-down, $В_{і}$, and activation energies, $Е_{і}$ in beryllium are calculated within the scope of the dislocation—disclination model in a wide temperature range. As shown, theoretically evaluated values well agree with experimentally obtained ones.

Key words: low-frequency internal friction, amplitude and temperature dependences, microplastic deformation, velocity of dislocation, auxetic effect, Poisson’s ratio.

URL: http://mfint.imp.kiev.ua/en/abstract/v37/i12/1595.html

DOI: https://doi.org/10.15407/mfint.37.12.1595

PACS: 61.72.Hh, 61.72.Lk, 62.20.dj, 62.40.+i, 81.40.Gh, 81.40.Jj, 81.70.Bt

Citation: O. Yu. Tashchuk, M. K. Myshylyuk, A. V. Oliynych-Lysyuk, and M. D. Rarans’ky, Evolution of Defect Subsystems During Microplastic Deformation of Auxetic Beryllium, Metallofiz. Noveishie Tekhnol., 37, No. 12: 1595—1602 (2015) (in Ukrainian)


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