Metastable Zr_100-x{Al}ₓ$ alloys have been formed by ball milling of elemental Zr and Al powders: supersaturated hcp solid solution for x{≤}15, and an amorphous phase for x{≥}17.5. Enthalpy-composition curves for both phases were determined by measurements of the enthalpy of transformation to equilibrium. A cusp indicating the crossover of these two curves is observed near the critical composition for amorphization. Our results indicate that phase formation by ball milling in Zr-Al is determined by polymorphous constraints and not by nucleation and growth under metastable two-phase equilibrium.
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Ma et al. (1991) studied this question.
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