Multiscale deformation of commercial titanium and alloy Ti-6Al-4V subjected to high-frequency electron beam treatment
The paper studies the effect of high-frequency electron beam irradiation on the surface morphology, microstructure, and phase transformations in the surface layers of commercial titanium and titanium alloy Ti-6Al-4V. The plastic deformation of the modified surface layers of the studied specimens has been found to occur at several scale levels under uniaxial stretching. It is found that the main plastic deformation mechanism of the modified surface layers is shear induced by maximum tangential stresses. Dislocation deformation mechanisms effectively accommodate the material rotation caused by the displacement of one part of the crystal relative to the other. Non-crystallographic shear propagation in the surface layer with nonequilibrium martensitic structure is associated with the plastic distortion of the crystal lattice and with reversible structural phase transformations.