With the development of technology and industries, newer materials such as Tungsten, Molybdenum etc. and various other Super Alloys and Ceramics have been developed which are being widely used in nuclear engineering, aerospace and various other industries because of their hardness, heat resistance qualities and high strength to weight ratio. Machining of these hard materials is very difficult by conventional machining processes. Therefore non-conventional machining processes have been developed for the machining of such type of materials. The Objective of this work is mainly to study the effect of various input parameters like Electrode material, Discharge Current, Gap Voltage, Pulse-On Time, Pulse-Off Time on the various output parameters like MRR, TWR and Surface roughness. In this study, these output parameters are studied by using the Taguchi's Design of Experiments through Minitab software. Using this software, Means and S/N ratios for all the output parameters were calculated. Micro structure was also observed using SEM machine.
Non equilibrium crystallization of Aluminium based alloys with transition metals. The solidification of Al-rich Al-Mn alloys (3.5 %, 4 % & 4.5 % wt) and Al-rich Al-Cu-Mn system has been studied both experimentally and by calculation of the phase equilibria using ThermoCalc software. For Al-Mn system, the results of the previous studies which indicated that one or more stable intermetallic phases get suppressed on solidification from the liquid, have been confirmed. Al-Mn-Cu ternary system in the aluminium rich region is experimentally investigated in as-cast state. Phase relations and solubility limits have been determined for the binary and ternary compounds using SEM/EDS, EPMA and XRD techniques. The ternary compound 1 has been found in the Al-Cu-Mn system, the compositions and it's homogeneity ranges has also been determined. This phase forms not only by U4 or U7 type reactions but also by ternary eutectic E2 type reaction in Al-rich region. The composition of 1 has an average composition of Al20Mn3Cu2/ Mn6Cu4Al29. It is much better to consider a general composition of Mn6+xCu4+yAl29-x-y.