Microstructure and tribological properties of laser clad Ti2Ni3Si/NiTi intermetallic coatings

摘要: Abstract Wear resistant Ti 2 Ni 3 Si/NiTi full intermetallic composite coatings with a microstructure consisting of ternary metal silicide Si primary dendrites and interdendritic eutectic were fabricated on substrate 0.2%C low carbon steel by the laser cladding process using Ti-Ni-Si alloy powders as precursor materials. Microstructure was characterized optical microscopy (OM), scanning electron (SEM), X-ray diffraction (XRD) energy dispersive analysis (EDS). resistance clad evaluated under dry sliding wear test conditions at room temperature. Results indicate that have excellent abrasive adhesive because unique combination high yield strength toughness compound NiTi hardness, strong covalent dominant atomic bonds possible hardness anomaly MgZn type Laves crystal structure.