Abstract
Tensile creep experiments on melt-spun ribbons of Pd 40Ni 40P 19Si 1 were performed near the glass transition temperature. Changes in the shear viscosity during relaxation were measured and equilibration of the glass to the metastable super-cooled liquid state was observed. The relaxation behavior varied considerably, depending on the thermal history of the sample: monotonie increases and decreases as well as crossover changes in the viscosity were measured. The results are interpreted with phenomenological and atomistic models for flow, and a qualitative modification of the atomistic defect model is suggested to account for the crossover behavior.
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