Abstract
The crystallization of melt-spun Mg 63Ni 22Pr 15 amorphous ribbons has been studied. The isochronal differential scanning calorimeter (DSC) measurement shows that the alloy has a certain glass-forming ability (GFA) according to different criterions. The analysis of with Kissinger equation indicates that the activation energy for the primary crystallization is relatively low. Nanocrystalline Mg 12Pr and Mg 2Ni phases appeared after the primary crystallization. Discussion based on Johnson–Mehl–Avrami (JMA) equation indicates that the isothermal process of primary crystallization starts from small dimensions with an increasing nucleation rate. The further fitting and discussion with some simplified models infers that the increasing nucleation rate is caused by the large difference between diffusivity of Mg atom and that of Ni and Pr atoms.
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