Abstract
In the present paper, the relaxation phenomena in a multicomponent metallic glass, Ni 45 Fe 5 Co 20 Cr 10 Mo 4 B 16 , has been investigated through electrical resistance, acoustic emission and Mössbauer spectroscopy to understand the mechanism of structural relaxation in the amorphous matrix. Isothermal electrical resistance measurements clearly show that the structural relaxation occurs discontinuously through a number of discrete steps. There exists a good deal of correspondence between the variations of the acoustic emissions and the electrical resistance with time and temperature. It is shown that the stepwise change in the electrical resistance arises due to the viscous flow in the matrix which is associated with the acoustic emissions. Fourier deconvolution analysis of the Mössbauer spectra recorded at room temperature was carried out for the as-received sample as well as those relaxed at various annealing temperatures. The QS-distributions and QS-IS correlation, so obtained, clearly show that the structural relaxation induces a small but definite change in the short-range order. Present results indicate that the viscoelastic flow is the primary unit process responsible for structural relaxations in the matrix.
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