International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 10 Issue: 05 | May 2023 www.irjet.net p-ISSN: 2395-0072 © 2023, IRJET | Impact Factor value: 8.226 | ISO 9001:2008 Certified Journal | Page 1148 STUDY ON TRIBOLOGICAL POPERTIES OF AZ91D MAGNESIUM COMPOSITE REINFORCED WITH B4C AND ZrO2 Rangubhotla Teja*, Dr. Prasanna Prattipati**, Singaiah Gali*** *(M.Tech, Department of Mechanical Engineering, JNTUH University College of Engineering Hyderabad, India, **(Assistant Professor, Department of Mechanical Engineering, JNTUH. Hyderabad, India, ***(Research Scholar, Department of Mechanical Engineering, JNTUH. Hyderabad, India. -----------------------------------------------------------------------***---------------------------------------------------------------------- Abstract: In present study, the tribological behavior of AZ91D Magnesium alloy matrix reinforced with 3 wt.% of B4C and 2 wt.% of ZrO2 was investigated. The composites were produced by the Bottom Pouring Stir Casting Process. The tribological properties were studied using Pin on Disc apparatus as per ASTM G99 standards. Percentage of reinforcement, sliding velocity and applied load have been taken as the factors/variables for evaluating wear rate and friction coefficient. The test conditions taken for conducting the test for tribological responses is designed using design of experiment. The wear test was carried out using an experiment design based on the Taguchi method. The influence of each individual element on the performance of composite wear was evaluated using the variance analysis (ANOVA). The weight percentage of reinforcements, load, and speed were found to significantly affect the wear characteristics. A mathematical model for wear and coefficient of friction was developed using the response surface methodology, and it was confirmed by conducting an experiment at the ideal level. Keyword: AZ91D/B4C/ZrO2, Pin On Disc Apparatus, ANOVA, Taguchi method, Response Surface Methodology I. INTRODUCTION Low-density composites based on magnesium have attracted attention on the automotive and aerospace industries' for the ongoing research on lighter materials. Magnesium has many benefits, including low density, increased specific strength, effective dampening, and superior dimensional stability. Magnesium's usage in piston-cylinder liners and other real-time applications has been constrained, however, by its poor wear resistance, inherent brittleness, and poor temperature stability. In order to boost the wear resistance of the magnesium matrix, reinforcing particles, especially those of nanoscales, are sought. Due to the fact that a material's wear resistance is determined by its capacity for plastic deformation, nanoparticles can get stronger and harder, increasing wear resistance. Zirconia reinforced composites offer significantly improved refractoriness, chemical resistance, and abrasion resistance when compared to composites with conventional reinforcements. In the majority of magnesium composites, plastic deformation is not possible. Nano-scale reinforcements can be used to get around this restriction. And by the addition of Boron Carbide, hardness and melting point of the composite will be increased. Hamid Raza studied that, by the addition of B4C the hardness value of Al20%Mg2Si was increased [1]. With respect to Zirconia, Ke Qiao et al observed that, on the addition of Zirconia, the brittleness of the composite was increased and the elongation was decreased [2]. It is observed that, by the addition of ZrO2, the hardness and strength of the material were increased [3-4]. Ravi Kumar studied that, on the addition of Tungsten Carbide as a reinforcement, the density of the AZ91D alloy was increased and elongation was decreased [5]. Nishita Anandan observed that, on the addition of small sized reinforcement to the AZ91D alloy, the particulate fracture and voids due to particulate debonding was not observed extensively [6]. Fareeha Ubaid et al fabricated the alloy of Aluminium and B4C using Microwave sintering method and followed by hot extrusion. She observed that, on the addition of B4C nanoparticles the yield strength and the ultimate strength were increased but the ductility behavior was opposite to the ductility of the pure Aluminium [7]. J. Udaya Prakash et al. (2018) used taguchi- based grey relation analysis approach to optimise the wear parameters of 413 Aluminium Alloy reinforced with 3%, 6%, and 9% B4C. For the creation of composite, the stir casting method was used. Using pin-on-disc testing equipment, a dry sliding wear test was conducted. The most crucial elements in determining the friction