Thermal and mechanical stability of metallic glass ferromagnets

  • Chen H
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Abstract

Differential scanning calorimetry (DSC), temperature dependence of ductility and hardness and stress relaxation measurements have been employed to study the thermal and mechanical stability of a Ni55Cr5Nb40 glass. The results are compared with the data reported [1. L.E. Collins, N.J. Grant and J.B. Vander Sande, J. Mater. Sci.18, 804 (1983); 2. L.E. Collins and N.J. Grant, Mater. Sci. Engng61, 137 (1983)] for the binary Ni60Nb40 glass to ascertain the effects of Cr addition. It is observed that crystallization temperature and activation energy for crystallization of Ni55Cr5Nb40 glass are considerably less than that of the binary alloy. An annealing embrittlement phenomena is observed in the ternary glass similar to that reported in Ni60Nb40, however, ductile-brittle transition temperature is reduced drastically on the addition of Cr. Hardness increases on annealing and follows a behaviour similar to that of embrittlement. Kinetic studies of annealing embrittlement and stress relaxation yield a spectrum of activation energies for structural relaxation. These values are significantly smaller than for the Ni60Nb40 glass. It is concluded that the addition of Cr reduces the thermal as well as the mechanical stability of the Ni60Nb40 glass.

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Authors

  • H. S. Chen

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