Optimization of machining parameters in drilling of LM6/B4C/Fly ash hybrid composites Jayavelu Udaya Prakash, Charles Sarala Rubi, Sivaprakasam Palani, Sunder Jebarose Juliyana and Arasumugam Divya Sadhana Manufacturing Rev., 9 (2022) 28 Published online: 03 October 2022 DOI: 10.1051/mfreview/2022026