Eleventh International Conference on Internal Friction and Ultrasonic Attenuation in Solids
J. Phys. IV France 06 (1996) C8-811-C8-814
Internal Friction and Elastic Properties of Nanocrystalline Fe-Si-Nb-Cu AlloyN.P. Kobelev and Ya.M. Soifer
Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow district 142432, Russia
The anomalous elastic modulus reduction in the nanocrystalline Fe73.4 Cu1Nb3.1Si13.4B9.1 alloy was found. Sound wave velocity and internal friction as a function of annealing temperature were measured in a magnetic field by the vibrating reed technique. In the as-prepared state a large modulus defect was observed which disappeared after annealing above a characteristic temperature (much less than the crystallization temperature) defined as a temperature of the structural rearrangement. The "in-situ" measurements revealed the irreversible internal friction peak and an accompanying elastic modulus increase at this temperature. In the same temperature region the irreversible changes of the ΔE were observed.
© EDP Sciences 1996