Anelastic crossover and creep recovery spectra in Fe_(40)Ni_(40)B_(20) metallic glass

摘要

Property changes of amorphous samples during annealing - enthalpy (1,2), elastic constants (2), resistivity (3,4) and magnatic anisotropy (5,6) - reveal that besides irreversible structural relaxation below the glass transition temperature there are reversible structural changes brought about by thermal, magnetic or me-chanical effects. The kinetics of these structural changes (2,6) suggest that more than one relaxation mechanism is present. In order to get clear evidence of a relaxation spectrum, many crossover experiments have been performed studying properties such as Young’s modulus (2), Curie temperature (6), viscosity (7), resistivity (4), induced anisotropy and magnetic after-effect (5). The existence of a crossover effect in a property ch,ange during reversible structural ordering means that there is neither a single relaxation process nor a single ordering parameter.