Technical Physics Letters
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Estimation of the density of mobile dislocations by the acoustic method
Barannikova S. A.
1, Lavrent’jeva P. V.
1, Zuev L. B.
1
1Institute of Strength Physics and Materials Science of Siberian Branch of Russian Academy of Sciences, Tomsk, Russia
Email: bsa@ispms.ru, iskhakova@ispms.ru, lbz@ispms.ru
Using polycrystalline Al as an example, it is demonstrated that measuring the velocity of ultrasound (Rayleigh surface waves) propagation provides information on the development of deformation processes in metals. The acoustic wave parameters determined in this study make it possible to estimate the density of mobile dislocations in the metal deformed under quasi-static loading. A complex (extreme) character of the mobile dislocations dependence on deformation has been revealed; the paper discusses the nature of this dependence. We suggest that the obtained results may be used for calculating the deformation kinetics. Keywords: plasticity, strain hardening, dislocations, ultrasound.
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