Eleventh International Conference on Internal Friction and Ultrasonic Attenuation in Solids
J. Phys. IV France 06 (1996) C8-321-C8-324
Low Frequency Amplitude - Dependent Relaxation in Cu-Al-Ni CrystalsS. Kustov1, S. Golyandin1, J. Van Humbeeck2 and R. de Batist3
1 A.F. Ioffe Physical-Technical Institute, Russian Academy of Sciences, Politekhnicheskaja 26, St. Petersburg, Russia
2 Dept. MTM, Katholieke Universiteit Leuven, de Croylaan 2, Heverlee 3001, Belgium
3 IMS, University of Antwerpen (RUCA), Middelheimlaan 1, Antwerp 2020, Belgium
Pronounced peculiarities of the frequency and amplitude dependences of the amplitude-dependent internal friction have been revealed in martensitic β1' phase of quenched Cu-Al-Ni single crystals at temperatures 200-340 K. These peculiarities were not observed in β1' phase for crystals, subjected to ageing in austenite. Application of several experimental techniques, one of which enabled to observe directly a reversible anelastic strain during amplitude-dependent internal friction measurements, allowed to attribute the observed peculiarities of the frequency dependence in quenched samples to relaxation phenomena due to an interaction of mobile partial dislocations with mobile pinning obstacles.
© EDP Sciences 1996