Analysis of features of the deformation of auxetic beryllium
DOI:
https://doi.org/10.15587/1729-4061.2015.51339Keywords:
axial, non-axial auxeticity, Peierls energy, edge, screw dislocations, internal frictionAbstract
In the framework of the linear elasticity theory using the experimentally obtained elastic stiffness modules, temperature dependences of the elastic compliance modules and tensor components of Poisson's ratios of beryllium in a wide range of temperatures and directions in the crystal lattice were calculated, and it was shown that with increasing temperature, the value and signs of Poisson's ratios change differently in various temperature intervals. In the interval 0-300K, become negative in the direction [101] (non-axial auxetic). Under the change in temperature from 300 to 400 K, are positive in all directions in the crystal (not-auxetic state). Increase in the temperature from 400 K leads to negative values of in the directions [100], [010] and [001] (axial auxetic). Under the temperature above 473 K up to 600 K, are negative in the entire temperature range (full auxetic). The calculations are visualized by building sections of in the space of Euler angles by the plane (001), and by building the indicative surfaces of in the crystallographic coordinate system at different temperatures. Taking into account the influence of the value and sign of Poisson's ratios on the processes of microplastic deformation in Be, in particular on the movement of dislocations and their interaction with the dislocation atmospheres has allowed to explain the experimentally observed anomaly of amplitude dependences of internal friction in beryllium at a temperature increase in the range from 298 to 523 K.
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Copyright (c) 2015 Николай Дмитриевич Раранский, Алла Васильевна Олейнич-Лысюк, Михаил Николаевич Гунько, Александр Юрьевич Тащук
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