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A metastable nano-scale disordered precipitate with orthorhombic symmetry has been identified using high resolution scanning transmission electron microscopy. The phase, termed O′, is metastable, formed by a shuffle mechanism involving a 110<11̅0> transverse phonon wave in samples of Ti–26Nb–2Zr (at.%) quenched from the β phase. The addition of 2% Zr to Ti–26Nb appears to suppress significantly...
A nano-scale instability in the β phase resulting in the formation of the disordered orthorhombic O′ phase has been discovered in a fairly dilute binary Ti–Mo alloy, using selected area electron diffraction and high resolution scanning transmission electron microscopy. The O′ phase is formed in the alloy when the Mo content exceeds a critical value. The instability occurs in β-solutionized samples...
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