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H. A. Deore,J. Mishra,A. G. Rao,B. D. Bhanushali,V. D. Hiwarkar 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.1
Ti–6Al–4V/B4C surface composite, having uniform dispersion of reinforcement, was successfully fabricated via additive friction stir processing (AFSP) technique. The chemical reaction between B4C particles and Ti matrix resulted in the formationof intermetallics like TiBX and TiC. Optical microscopy, scanning electron microscopy, electron backscattered difractionand X-ray difraction were carried out to investigate the infuence of FSP, B4C reinforcement and post-FSP heat treatment onmicrostructure evolution. Microhardness, Charpy impact and pin on disc wear tests were performed to examine mechanicaland wear properties. Fully β transformed microstructure composed of basket-weave lamellar α/β together with the needle-likeultrafne martensite α′ was observed in FSPed stir zone. B4C particles brought about additional microstructure refnementby pinning prior β grain boundaries (Zener pinning) and enhancing the nucleation rate (particle stimulated nucleation). Surface composites fabricated via AFSP exhibited higher hardness, wear-resistance and impact toughness compared to thebase metal Ti–6Al–4V and FSPed Ti–6Al–4V.