Calorimetric evidence for polymorphous constraints on metastable Zr-Al phase formation by mechanical alloying
- 26 August 1991
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 67 (9) , 1126-1129
- https://doi.org/10.1103/physrevlett.67.1126
Abstract
Metastable 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.
Keywords
This publication has 21 references indexed in Scilit:
- Effect of plastic flow on the kinetics of amorphous phase growth by solid state reaction in the Ni-Zr systemPhysical Review Letters, 1990
- In situthermal observation of explosive compound-formation reaction during mechanical alloyingPhysical Review Letters, 1990
- Materials Synthesis by Mechanical AlloyingAnnual Review of Materials Science, 1989
- Glass-forming ranges in transition metal-Zr alloys prepared by mechanical alloyingJournal of the Less Common Metals, 1988
- Progress of the amorphization reaction during mechanical alloying in Fe-ZrJournal of Applied Physics, 1988
- Formation of amorphous alloys by the mechanical alloying of crystalline powders of pure metals and powders of intermetallicsApplied Physics Letters, 1986
- Amorphization of transition metal Zr alloys by mechanical alloyingApplied Physics Letters, 1986
- Thermodynamic and kinetic aspects of the crystal to glass transformation in metallic materialsProgress in Materials Science, 1986
- The synthesis of amorphous NiTi alloy powders by mechanical alloyingJournal of Non-Crystalline Solids, 1985
- Formation of an Amorphous Alloy by Solid-State Reaction of the Pure Polycrystalline MetalsPhysical Review Letters, 1983