Abstract
In this study, ribbons and thin films of Mg65Zn30Ca5 (at.%) metallic glass were prepared by melt-spinning and magnetron sputtering deposition techniques, respectively. With nanocalorimetry and structural characterization, the rapid crystallization mechanisms of the Mg65Zn30Ca5 ribbon and thin film were evaluated comparatively. The metallic glass thin film has a lower crystallization temperature but a higher apparent activation energy compared to the ribbon. The granular and hierarchical surface of the film promotes heterogeneous nucleation, leading to a lower crystallization temperature. The crystal nucleation and growth processes are analyzed using the Johnson-Mehl-Avrami equation. Compared with the ribbon, whose crystallization is dominated by the growth of pre-existing nuclei, both nucleation and crystal growth occur during the crystallization of the thin film, leading to a higher activation energy. With respect to the ribbon, the crystal growth rate of the thin film is exceptionally higher because of the formation of ordered microstructures inside the film.
Published Version
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