Seventh International Conference on Internal Friction and Ultrasonic Attenuation in Solids
J. Phys. Colloques 42 (1981) C5-1025-C5-1030
NONLINEAR RESONANCE IN CuAlNi ALLOYSM. Wuttig1 et T. Suzuki2
1 Department of Metallurgical Engineering, University of Missouri-Rolla, Rolla, MO 65401, U.S.A.
2 Institute of Applied Physics, University of Tsukuba, Sakura, Ibaraki 305, Japan
The phenomenological theory of resonance of a non-linear anelastic reed is presented. It predicts three modes of oscillation, one in which amplitude and phase are constant and two in which they vary in time. The automodulations corresponding to the latter two can either be sinusoidal or have square wave character. Nonlinear resonances and both types of automodulations have been observed in CuAlNi alloys in the vicinity of the martensitic transformation. They are attributed to the motion of interfaces.