Georgian Scientists/ . 5  N 2, 2023 296

Georgian Scientists

Vol. 5  Issue 2, 2023

https://doi.org/10.52340/gs.2023.05.02.37

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Effect of quenching on the dynamic mechanical properties of polycrystalline
vanadium

I.Tabatadze1, I.Kurashvili1, I.Janelidze2, G.Darsavelidze1

1 Ilia Vekua Sukhumi Institute of Physics and Technology
2 Georgian Technical University

Abstract
The effect of quenching at high temperatures on the regularities of changes of the logarithmic decrement
of  the  torsional  oscillations  damping  and  the  dynamic  shear  modulus  in  the  10-5-10-3 interval of strain
amplitude in polycrystalline vanadium has been studied. The critical values of the strain amplitude, at which
the dislocations segments begin to breakaway from the weak and strong pinning centers have been
determined. After short annealing (20 min.) at fixed tempertures of 700 and 900° C and subsequent
quenching at room temperture a decrease of impurity concentration in Cottrell atmosphere around the
dislocations is achieved. These changes led to a significant reduction of the critical strain amplitude of
dislocations blocking and the dynamic shear modulus, and a strong increase in the intensity of energy
absorption in a wide range of oscillations amplitudes. The concentration changes of the Cottrell atmosphere
around the dislocations led to the formation of several  values of elastic limits.
The obtained results reveal the possibilities of changing the mobility of the dislocation structure by
quenching from high temperatures, which is the basis for controlling of the mechanical properties of
vanadium.

Keywords: vanadium, shear modulus, quenching, elastic limit, strain amplitude.