Abstract
• The ω iso -phase formation in Ti-Nb-Zr alloy exhibits a pronounced C-shaped kinetics. • The ω iso -phase formation and growth are controlled by the shear-related mechanisms. • The “initial” stresses provide preferable sites for the ω iso -phase precipitation. • The “secondary” stresses induced by the ω iso -phase formation inhibit precipitation. Dependence of the isothermal ω iso -phase formation on heating, holding and cooling conditions during the ageing of Ti-Nb-Zr shape memory alloys remains insufficiently studied. The crystal structure and the ω iso -phase morphology of a thermomechanically treated Ti-22Nb-6Zr (at%) alloy during ageing in the 250–375 °C temperature range under different heating, holding and cooling conditions is studied using X-ray diffraction and transmission electron microscopy. It is shown that β → ω iso transformation during ageing of this alloy manifests a C-shaped kinetics with a maximum at 300 °C, and the ω -phase formation and growth are predominantly controlled by the shear-related mechanisms and only marginally, by the diffusion-related mechanisms.
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