The ultrasonic attenuation and the modulus defect were investigated in <111>-deformed monocrystals. The experimental results were explained in terms of over-damped dislocation kink resonance and kink relaxation (stress-induced double-kink formation, responsible for the Bordoni peak). The Bordoni relaxation could be described by assuming only 1 activation energy and relaxation time (as deduced from an Arrhenius plot). The kink density contribution to the resonance mechanism was shown to be temperature-dependent.

A.O.M.Gobbi, J.A.Eiras: Journal of Alloys and Compounds, 1994, 211-212, 152-4