Abstract
Annealing effects in Ni 60Nb 40-nxAl x ( x = 0, 5 and 10 at.%) glasses were investigated using differential scanning calorimetry, ductility, hardness and stress relaxation measurements. It was observed that the annealing behaviour of Ni 60Nb 40 glass remained almost unaltered on addition of up to 5 at.% Al. Aluminium additions of greater than 5 at.% caused reductions in both the thermal and the mechanical stability of the Ni 60Nb 40 glass. The decrease in the mechanical stability was found to be much greater than that in the thermal stability. The as-quenched ductility of Ni 60Nb 40 glass did not change on addition of aluminium though a decrease in hardness was observed. Annealing caused an increase in hardness which followed a pattern similar to that of embrittlement. A single-stage embrittlement behaviour was observed in the temperature range investigated. Kinetic studies of annealing embrittlement and stress relaxation yield a spectrum of activation energies for structural relaxation.
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