Abstract
A recently developed Adiabatic Nucleation Theory (ANT) has been applied to pure liquid metals, inorganic (ceramic) glasses and polymers. In this paper, ANT is shown to be in good agreement with experimental data for metallic glasses of eutectic or nearly eutectic composition. The glass transition temperatures ( T g) of these metallic glasses are about coincident with the maximum (liquid) supercooling temperatures ( T−) predicted by ANT. During slow cooling, the liquid samples crystallize easily by heterogeneous nucleation. During fast quenching, however, the heterogeneous nucleation centers can grow only slightly and almost the whole sample remains amorphous when T g is attained. It is well known that T g is an increasing function of the quenching speed. Therefore, a fast quenching increases T g above T− and improves the stabilization of the metallic glass, because then also homogeneous nucleation is avoided.
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