ON THE FREQUENCY-DEPENDENCE OF THE HIGH-TEMPERATURE BACKGROUND

The high temperature background (HTB) damping in metals and alloys has been measured mostly as a function of temperature. These data were de scribed by several empirical expressions proposed in the literature. I n the present work, HTB in pure Mg and in two alloys (Zry-4 and Cu-5at .%Au), measured with a torsion pendulum with variable moment of inerti a, are analyzed on considering a new treatment of the data. This analy sis provides an useful tool to determine whether a damping process is linear or not.