Low frequency damping properties of Cu–Al–Be alloy during the phase transformation

The damping properties of Cu–Al–Be alloys are investigated by measurement of internal friction (IF). The IF and its dependence of the measuring frequency and amplitude during temperature variation and under isothermal condition are investigated by means of an inverted torsion pendulum. The IF peak associated with the martensitic transformation and the change of the sub-structure in the low temperature phase are obtained in a Cu–Al–Be alloy. Based on the dependence of measuring frequency and temperature rate, the mechanism of IF peaks are discussed.