Abstract
The thermal stability of NI78SixB22−x (x = 6, 9, 12, 15) metallic glasses, produced by the single-roll melt spinning method, has been investigated by differential thermal analysis (DTA) and by measuring the temperature dependences of the exoelectron emission (EEE) and contact potential difference (CPD) relative to platinum. It has been found that both CPD and EEE show anomalies at temperatures corresponding to the structural transformations in the surface layer of investigated materials. The surface crystallization occurs at temperature of ∼ 150 K lower than the volume crystallization. The activation energy for the surface crystallization is also distinctly lower than that for crystallization in bulk.
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