A Novel Optimization of Feed and Spindle Speed Levels for Surface Roughness and Cylindricity Tolerance of the Drilled Holes in Liquid Stir Casted Al6061 Hybrid Metal Matrix Composite Reinforced with 15% Weight Fraction of B4C+Fly ash and Comparing with th. Journal of Pharmaceutical Negative Results [Internet]. 2022 Sep. 27 [cited 2026 Jun. 30];:438-49. Available from: https://pnrjournal.com/index.php/home/article/view/931