INTERNAL FRICTION PHENOMENA ASSOCIATED WITH DIFFUSIONLESS PHASE TRANSFORMATIONS IN ALLOYS

Abstract
Internal friction and ultrasonic attenuation peaks associated with diffusionless phase transformations in alloys, such as thermoelastic martensites and others, were reviewed. They were discussed from the stand point of (1) Understanding the mechanism of the phase transformations and (2) Developing new alloy materials of high damping capacity for application to noise and vibration abatement. Phase transformation peaks, a twin-boundary relaxation peak, and a Zener peak were identified in Mn-Cu, Mn-Ni, In-Tl, In-Cd, Au-Cd, Ti-Ni, Cu-Al-Ni, Cu-Al-Mn, and Cu-Zn-Al alloys, respectively.