ULTRASONIC INFLUENCE ON NANOSTRUCTURE IN Zr-2.5%Nb ALLOY

It was investigated the influence of ultrasonic action on nanoctructure of deformation origin in the alloy of Zr-2,5%Nb. The nanoctructure state was obtained by the combined rolling at 300 and 100 K on 96%. By means of electronic microscopy there were evaluated density of dislocations in the body of nanograins and volume concentration of grane phase, the level of stresses of 2-nd kind, and also change of these characteristics as a result of action of ultrasonic vibrations with stresses amplitude 85 and 200 MPa. The looked after effects are due to microshear relaxation in area of stress concentrators at relative low amplitudes of ultrasonic vibrations and by destruction of initial nanoctructure and forming the new, more equilibrium, as a result of intensification of interaction of the fields of internal stresses, at large amplitudes. It is marked that ultrasonic deformation of nanostructure results, in the total, in realization of dynamic recovery processes with maintenance of nanostructure morphology. Thus there are a decrease of internal stresses level and smoothing of its spectrum, and also increase of structure homogeneity.