Abstract
The precipitation of fcc-Al nanocrystals in Al-based metallic glasses was discussed and bifurcated into two classifications: one-step direct crystallization and two-step separated crystallization. In this work, we suggest that the inhomogeneous distribution of Al-rich regions in Al-based metallic glasses only determined the morphology of fcc-Al nanocrystals but not the two-step separated fcc-Al crystallization processes. Elemental doping (e.g., Si) is also excluded as a dominant factor of the two-step separated fcc-Al crystallization. In contrast, different processes of fcc-Al crystallization is most likely attributed to the maximum Al concentration and the adjacent gradient in the original Al-rich regions, the diffusion capability of each elements, and the completely crystallized products.
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