Research Article Optimization of Reinforced Aluminium Scraps from the Automobile Bumpers with Nickel and Magnesium Oxide in Stir Casting V. Vijayan, 1 A. Parthiban, 2 T. Sathish , 3 L. Ponraj Sankar, 4 S. Dinesh Kumar, 5 S. Saravanakumar, 6 and Dawit Tafesse 7 1 Department of Mechanical Engineering, K. Ramakrishnan College of Technology (Autonomous), Samayapuram, Trichy 621 112, Tamil Nadu, India 2 Department of Mechanical Engineering, Vels Institute of Science, Technology & Advanced Studies, Pallavaram, Chennai 600 117, Tamil Nadu, India 3 Department of Mechanical Engineering, Saveetha School of Engineering, SIMATS, Chennai 602 105, Tamil Nadu, India 4 Department of Civil Engineering, CMR Institute of Technology, Hyderabad, India 5 Department of Mechanical Engineering, St. Peter’s Institute of Higher Education and Research, Avadi, Chennai 600 054, Tamil Nadu, India 6 Department of Mechanical Engineering, M.Kumarasamy College of Engineering, Karur, Tamil Nadu, India 7 Department of Mechanical Engineering, Faculty of Manufacturing, Institute of Technology, Hawassa University, Hawassa, Ethiopia Correspondence should be addressed to Dawit Tafesse; dawitt@hu.edu.et Received 25 June 2021; Accepted 16 July 2021; Published 31 July 2021 Academic Editor: Samson Jerold Samuel Chelladurai Copyright © 2021 V. Vijayan et al. is is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Here, the investigation is spotlighted on the aluminium alloy from the waste materials of the automobile bumpers which is a reinforced metal matrix composite created with 5 percentage of nickel and 5 percentage of magnesium oxide through the stir casting method. e stir casting process inputs parameters such as pressure of squeezing, time of squeezing, and speed of stirrer which were optimized based on the two mechanical properties’ outcome such as the tensile strength (TS) and Rockwell hardness. ere are nine different experiments which were conducted based on the L9 array. e Taguchi method is used to identify the optimum input values for the greatest result of the processing condition by Minitab software. e responses-based parameters were ordered based on the rank identified through the investigational effects. Finally, the optimized input consideration values and the linear equations are recommended for both the considered outputs as conclusions. 1. Introduction Around the world, scraps of the automobiles are increased day by day, so the effective utilization of the wastes of au- tomobiles, such as accidental bodies, damaged bodies, and replaced bodies, can be reusable after recycling. Here, es- pecially the automobile bumpers which are made up of aluminium were chosen for this investigation. Christy et al. [1] completely explained about optimization techniques used for the input parameters of the squeeze and stir casting with the help of the Taguchi technique. ey also explained with the various microstructure diagrams and comparison plots. ey used the four input parameters for the four output responses. e basic things of the optimization techniques for the various machining processes of com- posites such as various proportions of aluminium with zirconium carbide composite [2], several combinations of aluminium with silicon carbide [3], and numerous combi- nations of aluminium with nanomaterials [4] in the same way machining such as parameters of the laser welding Hindawi Advances in Materials Science and Engineering Volume 2021, Article ID 3735438, 10 pages https://doi.org/10.1155/2021/3735438