Omega phase in materials

The omega phase is a metastable phase which forms in alloys of titanium and zirconium with most transition metals. In this paper the available data from both alloy systems on the occurrence, the structure, the mechanism of formation, and the morphology of the phase are reviewed and compared. The effect of omega phase on the mechanical behaviour and on the superconducting properties is then discussed. It is concluded that uncertainties still exist on the mechanism of the omega transformation during quenching and on the mechanism of the effect of omega on the mechanical properties.

The formation of omega phase in titanium and zirconium alloys: A review

At high pressures, as determined by x-ray analysis, titanium and zirconium metal have a distorted, body-centered-cubic structure. This phase persists on pressure release. The normal hexagonal close-packed structures are recovered when the metals are heated. An electronic shift must occur in the transition. Hafnium metal showed no such transition.

https://science.sciencemag.org/content/sci/140/3562/72.full.pdf

Crystal Structures of Titanium, Zirconium, and Hafnium at High Pressures

On the mechanism of superelasticity in Gum metal

A description of the martensitic transformations between the , , and phases of titanium that includes nucleation and growth requires an accurate classical potential Optimization of the parameters of a modified embedded atom potential to a database of density-functional calculations yields an accurate and transferable potential as verified by comparison to experimental and density-functional data for phonons, surface and stacking fault energies, and energy barriers for homogeneous martensitic transformations Molecular-dynamics simulations map out the pressure-temperature phase diagram of titanium For this potential the martensitic phase transformation between and appears at ambient pressure and 1200 K, between and at ambient conditions, between and at 1200 K and pressures above 8 GPa, and the triple point occurs at 8 GPa and 1200 K Molecular-dynamics explorations of the kinetics of the martensitic - transformation show a fast moving interface with a low interfacial energy of 30 meV/A 2  The potential is applicable to the study of

Classical potential describes martensitic phase transformations between the α, β, and ω titanium phases

The ω-phase in zirconium base alloys

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The ω-phase in zirconium base alloys