An ordered metallic glass solid solution phase that grows from the melt like a crystal
Résumé
We report structural studies of an Al-Fe-Si glassy solid that is a solid solution phase in the classical thermodynamic sense. We demonstrate that it is neither a frozen melt nor nanocrystalline. The glass has a well-defined solubility limit and rejects Al during formation from the melt. The pair distribution function of the glass reveals chemical ordering out to at least 12Å that resembles the ordering within a stable crystalline intermetallic phase of neighboring composition. Under isothermal annealling at 305 °C the glass first rejects Al, then persists for approximately 1 h with no detectable change in structure, and finally is transformed by a first-order phase transition to a crystalline phase with a structure that is different from that within the glass. It is possible that this remarkable glass phase has a fully ordered atomic structure that nevertheless possesses no long-range translational symmetry and is isotropic.
Mots clés
- Classical thermodynamics
- Crystal atomic structure
- Translational symmetry
- Structural studies
- Solid solution phase
- Pair distribution functions
- Pair distribution function analysis
- Intermetallic phase
- First-order phase transitions
- Glass transition
- X ray scattering
- Solid solutions
- Phase transitions
- Nanocrystals
- Metallic glass
- Intermetallics
- Glass
- Distribution functions
- Crystalline materials
- Aluminum
Domaines
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