Evolution of structural and phase state of the Ti-Al-V-Mo system titanium alloy in the process of the ultrafine-grained structure formation with the use of reversible hydrogenation

Electron-microscopic and X-ray diffraction analyses were used to study the features of structural and phase state evolution of the Ti-Al-V-Mo system alloy during the formation of an ultrafine-grained structure by a method combining hot plastic deformation and reversible hydrogenation. It is shown that hydrogen presence (0.15 wt. %) in solid solution allows reducing more than twice the value of plastic deformation necessary to obtain in the alloy the ultrafine-grained state. It has been established that such processes as α^//→β→α and β→α¢¢ phase transformations and redistribution of alloying elements contributing to the formation of fine-lamellar morphology in grains and maintaining a high level of strength properties of the ultrafine-grained structure take place in the process of deformation and subsequent hydrogen degassing from the alloy.

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