Shock Loading Effect on the MHz-Range Amplitude-Independent Internal Friction and Elastic Properties of the ??1 Martensite Phase in Cu-Al-Ni Alloys

Abstract

The internal friction spectrum at 5 MHz in the martensite b 0 1 -phase of CuAlNi alloys shows two prominent internal friction peaks at 270 and 170 K. Corresponding anomalies in the sound wave velocity-temperature dependence have been observed. Detailed analysis of the behaviour of the peaks in dependence on different levels of impact loading and g-irradiation points to dislocationpoint defect interaction. It is assumed that grain boundary dislocations are responsible for the 270 K peak while lattice dislocation, existing within the martensite variants are responsible for the 170 K peak.