Relaxation behavior of an Al-Y-Ni-Co metallic glass in as-prepared and cold-rolled state

Abstract

Dynamical mechanical behavior of the Al85Y8Ni5Co2 metallic glassy ribbon samples in the as-prepared state and subjected to cold rolling with 35 % size reduction is studied in the present work and compared with the results of thermal mechanical analysis performed at a constant load. Deformation of the samples was also modeled by different values (such as reaction force, viscosity, speed of sound and so on) in frames of the same physic-mechanical model. The values of the above mentioned parameters, predicted by calculations, are found to be in good agreement with the experiment. The influence of different external conditions on the properties of the alloy was analyzed upon dynamic mechanical analysis at the different temperatures (up to the glass transition range). The structural mechanisms leading to the observed effects are described in frames of "shear bands" and "free volume" models.