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Primary crystallization in high Al-content metallic glasses is driven bynanometer-diameter regions with internal structure similar to fcc Al.Comparison of fluctuation electron microscopy (FEM) data to FEM simulations offcc Al clusters dispersed in a dense-random packed matrix is used to extractthe diameter and volume fraction of the ordered regions in a Al88Y7Fe5 baseglass and in glasses with 1 at.% Cu substituted for Y or Al. The size anddensity of nanocrystals were measured as a function of isothermal annealingtime for the same alloys. The volume fraction of crystalline material growsunder isothermal annealing, so the phase transformation is not purely graincoarsening, but the crystalline volume fraction is lower than the volumefraction of ordered regions in the as-quenched samples, so not all of theordered regions act as nuclei. Changes in diameter and volume fraction of theordered regions with alloying are correlated with changes in thecrystallization temperature, nucleation rate, and nanocrystal density. Noevidence for phase separation is observed, and FEM simulations from a moleculardynamics quenched structural model of similar composition do not show thefeatures observed in experiment.

Nucleation of Al Nanocrystals in Solute-Substituted Al Metallic Glasses I: Structural characterization