A method of production of a submicrocrystalline (SMC) structure (d < 1 mu m) in large work-pieces of the commercial pure titanium and the two-phase titanium alloys based on initiation of dynamic recrystallization (DRX) during hot working and reversible hydrogen alloying has been developed. The method involves continuous grain refinement due to DRX at decreasing temperature. Hydrogen alloying decreases deformation stress and increases ductility at temperatures lower than in hydrogen-free alloy and promotes the formation of the finest grain structure. The grain sizes of 0,1 - 0,2 mu m and 0,04 mu m have been produced in the hydrogenated commercial pure Ti and Ti - 11,4Al - 1,7Mo - 0,88Zr (at. %) based alloys, respectively. Specific features of phase transformations in the SMC titanium alloys after cooling from deformation temperature and after hydrogen removal by vacuum annealing were studied. Temperature dependences of mechanical properties for SMC titanium alloys are shown.

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