Microstructure and wear resistance of laser-melted TiC reinforced nickel aluminide dual-phase matrix in situ composite

A laser-melted TiC-reinforced nickel aluminide matrix in situ composite was fabricated. The composite consisted of well-developed TiC dendrites and a (NiAl–Ni3Al) dual-phase matrix. The microstructure of the laser-melted in situ composite was characterized by optical microscopy (OM), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD). Results show that the TiC/(NiAl–Ni3Al) composite has excellent wear resistance for both room- and high-temperature sliding wear test conditions.