Description
Over a number of decades, NiTi alloys have been at the center of high scientific, industrial and biomedical interest due to its shape adjustment property based on applied stress and mechanical condition. Despite that NiTi receives their vast majority of this interest; So far very less work has been conducted on textured foils of NiTi intermetallic. In present work, Textured Ni/Ti elemental foil have been successfully processed through current activated reactive combustion synthesis in order to combine both mechanical and electrical activation approach, And applying them for the first time on textured foils. The effect of mechanical activation and electric current intensity on the ignition and phase development is discussed. An increase in duration of current intensity was found to result in an increase in product homogeneity and product porosity. A two-stage reaction process was observed in the reaction-ignition experiments. The change of thickness at different regions in the mechanically rolled foils was studied. The first reaction stage was the lateral growth of NiTi2 and Ni3Ti phases at isolated nucleation sites and their subsequent coalescence into a continuous layer. The continuation of the reaction for longer duration of current intensity boosts the reaction kinetics, resulting in homogeneous growth of the NiTi layer in the direction normal to the Ni/Ti interface until entire foil has been consumed.
