Available online at www.sciencedirect.com ScienceDirect Materials Today: Proceedings 5 (2018) 23779–23788 www.materialstoday.com/proceedings 2214-7853© 2018 Elsevier Ltd. All rights reserved. Selection and/or Peer-review under responsibility of International Conference on Advances in Materials and Manufacturing Applications [IConAMMA 2017]. IConAMMA_2017 Multi-Objective Optimization using Taguchi and Grey Relational Analysis on Machining of Ti-6Al-4V Alloy by Powder Mixed EDM Process Arun Kumar Rouniyar a* , Pragya Shandilya a a *Department of Mechanical Engineering, Motilal Nehru National Institute of Technology Allahabad, 211004,India a Department of Mechanical Engineering, Motilal Nehru National Institute of Technology Allahabad, 211004,India Abstract Powder mixed electric discharge machining (PMEDM) is hybrid manufacturing process used in various industries for machining of advanced materials with complex profiles. PMEDM enhances the machining capabilities of the EDM process by mixing the conductive powder to the dielectric fluid. In this present work experimental design is performed using Taguchi L27 orthogonal array combined with grey relational analysis is used to determine the optimal set of process parameters for multi-objective responses on machining of titanium alloy. Pulse on time, peak current, pulse off time and concentration of graphite powder mixed in the dielectric medium are taken as input process parameters to analyze on the performance measures in terms of surface roughness and material removal rate. © 2018 Elsevier Ltd. All rights reserved. Selection and/or Peer-review under responsibility of International Conference on Advances in Materials and Manufacturing Applications [IConAMMA 2017]. Keywords:PMEDM; Taguchi; Grey relational analysis; Graphite powder; Surface roughness; Material removal rate. 1. Introduction Titanium alloy is popular alloy material widely used in automotive, aerospace, marine, chemical, electronic and biomedical industry because of its specific properties such as excellent corrosion resistance, high strength to weight ratio, dimensional stability, fracture resistance and biocompatibility. However machining of titanium alloy by conventional machining process is difficult because of low thermal conductivity, high chemical affinity and * Corresponding author. Tel.: +917621862610. E-mail address:rme1602@mnnit.ac.in