Abstract
The temperature and time dependence of the heat capacity of Al 30La 50Ni 20 and Al 15Ni 25Zr 60 alloys is measured between the metastable glassy and undercooled liquid states through the glass transition temperature T g by differential scanning calorimetry. The most precise heat capacities for the relaxed glassy, the undercooled liquid and the crystalline states are obtained using the stepwise heating method. Viscous flow measurements under constant heating rate conditions are carried out with the aid of a thermomechanical analyser. Two Arrhenius-type temperature dependences of the viscosity in the temperature ranges from T g − 90 K to T g and from T g + 20 K were observed, yielding activation energies of as-quenched samples for viscous flow.
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