Enhanced process parameters using TOPSIS method during Wire electro discharge machining of TiNiCo shape memory alloy

Abstract

Abstract: Shape memory alloys (SMAs) are most usable material in the field of biomedical, aerospace and robotics applications due to their unique class of properties. Super elasticity, shape memory effect and two phase transformation behaviour of these alloys make unique material. Machining of such kind of material is quite difficult through conventional machining process hence non-conventional machining of these materials is suitable. Ti50Ni40Co10 shape memory alloy was developed through Vacuum arc melting furnace for the present study. Wire electro discharge machining (A Non-conventional Machining) was used for machining of Ti50Ni40Co10 shape memory alloy. Moreover Topsis method implemented for the parametric optimization of wire electro discharge machining (WEDM). Pulse on time, Pulse off time, Servo voltage, wire speed and servo feed were considered as process parameters and productivity rate and surface quality (average roughness) were consider as output process parameters of WEDM. To see the effect of machining on the machined component EDX analysis has been carried out of optimal process parameters setting. 4.72 mm3 /min productivity rate and 1.26 µm average roughness was found at optimal combination of process parameters of WEDM. Moreover, during the EDX analysis Cu, Zn, O and C were noticed on the machined surface including the parent material