Abstract

Several internal-friction mechanisms in the first-order phase transition temperature region related to the fluctuation nucleation of a new phase and motion of the interphase boundaries affected by the external stresses are reviewed. Two different experimental conditions have been investigated: firstly measurements at constant heating rate, secondly after rather prolonged holding at each temperature. Elementary mechanical loss mechanisms have been proposed and the dependence of the internal friction on the frequency and amplitude of oscillation has been calculated for each mechanism. The predictions have then been compared with experimental data.

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