The influence of pulsed electron beams with different energy density on the structural and phase states in the surface layers of titanium nickelide is investigated. After impact to low-energy pulsed electron beams, the X-ray diffraction patterns of TiNi samples include not only the reflexes from the B2 phase but also reflexes corresponding to the martensitic phase B19′. With increase in energy density from 15 to 30 J/cm2, the content of the B19′ phase increases from about 5 to 80 vol %. In the surface layer (molten to a depth of about 10 μm), the Ti2Ni phase dissolves, with accompanying change in titanium and nickel concentration. The main phase formed in this modified layer is enriched with titanium relative to the level in B2 phase before irradiation. In the surface layers of TiNi samples after impact to pulsed electron beams with energy density 15 and 20 J/cm2, no B19′ phase is formed. In samples after impact to pulsed electron beams with energy density 30 J/cm2, the surface layer is martensitic over the whole depth of X-ray penetration.
ASJC Scopus subject areas
- Materials Science(all)