Synthesis and Characterization of Ni-B Binary Alloys Incorporating Vanadium

The microstructure of a series of binary Ni-B alloys containing various amounts of vanadium additions were investigated by Differential Thermal Analysis (DTA), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM) and Energy Dispersive X-ray Analysis (EDXA). Due to the vanadium addition in the alloys quenched from the liquidus, the formation of the Ni3B phase was enhanced even when the nominal composition was hypoeutectic. The addition of vanadium led to the formation of phase τ (Ni20.4V2.6B6) during the present investigation. In addition the crystallographic orientation relationship of this ternary phase with the nickel matrix was reported. The solid-state eutectoid transformation of the Ni3B phase during cooling was also reported and discussed. KEY WORDS: alloy, solidification, microstructure, adduct, transformation. Global Journal of Pure and Applied Sciences Vol.11(2) 2005: 277-28