Abstract
Ti-48Al-2Cr-2Nb alloy has received considerable attention because of its high-performance applications in the aerospace industries. With high strength and stiffness, Ti-48Al-2Cr-2Nb has a density only half that of nickel-based superalloy. Electrochemical machining is suitable for processing of such alloys. This study focuses on the electrochemical dissolution behavior of extruded and casted Ti-48Al-2Cr-2Nb in NaNO3 solution. The dissolution mechanisms of extruded and casted Ti-48Al-2Cr-2Nb are revealed. The open circuit potentials, polarization curves, and material removal rate of extruded and casted Ti-48Al-2Cr-2Nb are compared. The results indicate that both show similar polarization behavior, but extruded Ti-48Al-2Cr-2Nb has a higher material removal rate. Dissolution experiments carried out at different current densities and corrosion times show that the dissolution morphologies of extruded and casted Ti-48Al-2Cr-2Nb are significantly different. The former shows a gully-like dissolved morphology, but the lamellar colonies of the latter are fully exposed, and there is severe intergranular corrosion at low current density. With an increase of the current density, extruded Ti-48Al-2Cr-2Nb shows better surface quality. It was found that the lamellar plays an important role in electrochemical dissolution behavior. Electrochemical dissolution models of casted and extruded Ti-48Al-2Cr-2Nb are proposed.
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