Microstructure and wear resistance of laser melt depositedMo/ Mo₂Ni₃ Si metal sil icide alloys

The wear resistant Mo/ Mo₂Ni₃ Si metal silicide alloys consisting of ref ractory metal molybdenum primarydendrites toughening phase and interdendritic Mo₂Ni₃ Si ternary metal silicide mat rix were designed and fabricated bythe laser melt deposition process with molybdenum , nickel and silicon elemental powder as the raw materials.Microst ructures of the alloys were characterized by optical microscopy (OM) , scanning elect ron microscopy (SEM) ,X2ray diff raction (XRD) and energy dispersive spect roscopy ( EDS) . The volume f raction of molybdenum primarydendrites increases with increasing of the molybdenum atomic f raction in the raw material , while the hardness of thealloy decreases as increasing the molybdenum atomic f raction in the raw material. Wear resistance of the laser meltdeposited Mo/ Mo₂Ni₃ Si metal silicide alloys was evaluated under dry sliding wear test conditions at room temperature. The result s indicate that Mo/ Mo₂Ni₃ Si metal silicide alloys have out standing wear resistance because of theexcellent combination of high st rength and ductility of the ref ractory metal molybdenum primary dendrites and thehigh hardness and st rong atomic bonds of the Mo₂Ni₃ Si ternary metal silicide.