The dependencies of changes in the mechanical properties and deformation behavior of the TiNi alloy with synthesized Ti-Ni-Ta-based surface alloys with a thickness of ~ 1-2 μm were investigated in cyclic torsion tests. The synthesis of surface alloys was carried out by alternating the operations of deposition of a Ti₇₀Ta₃₀ and Ti₆₀Ta₄₀ (at. %) alloying film and liquid-phase mixing of the film/substrate using a pulsed low-energy high-current electron-beam. It was found that electron-beam synthesis leads to an increase in the stress of martensite shear tau_M by ~ 10-20 MPa, in the stress of mechanical hysteresis width Δtau by ~ 40-75 MPa, as well as to the ability of the material to accumulate and recover inelastic strain by ~ 0.2% more compared to initial TiNi alloy. After cyclic torsion tests, subsequent heating of the modified samples to a temperature T~ 308± 1 K leads to the recovery of the accumulated residual strain γ_total. Keywords: Ti-Ni-Ta-based surface alloys, nickel titanium alloy, additive thin-film electron-beam synthesis, torsion tests, superelasticity, mechanical properties, scanning electron microscopy, surface morphology.

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