Ultrasonic analysis reveals temperature-dependent relationships in hafnium's structural states, suggesting implications for material properties.
The temperature dependences of the propagation velocity VL(T) and the change in attenuation ΔαL(T) of longitudinal ultrasonic waves at a frequency of 50 MHz in high-purity hafnium deformed by quasi-hydroextrusion on 6% and by quasi-hydroextrusion with counterpressure on 16 and 30% at 77 K were studied using the ultrasonic spectroscopy method in the temperature range of 77–300 K. It is shown that the dependences ΔαL(T) have a resonant character, which is due to the intensification of relaxation processes attributed to dislocations. The influence of the aging time at room temperature and annealing at 450 and 750 °C on ΔαL(T) was studied. The temperature dependences of the longitudinal elasticity modulus at different degree of deformation have been determined. The influence of deformation on its magnitude is shown.
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Klochko et al. (2025) studied this question.
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