Dry Sliding Tribological Behavior of Al7010/B 4 C/BN Hybrid Metal Matrix Nanocomposites Prepared by Ultrasonic-Assisted
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ORIGINAL ARTICLE
Dry Sliding Tribological Behavior of Al7010/B4C/BN Hybrid Metal Matrix Nanocomposites Prepared by Ultrasonic-Assisted Stir Casting Gopichand Dirisenapu1 • Lingaraju Dumpala1 • Seelam Pichi Reddy2
Received: 13 July 2020 / Accepted: 11 November 2020 The Indian Institute of Metals - IIM 2020
Abstract In the present investigation, Al7010/B4C/BN hybrid metal matrix nanocomposites with varying weight percents (wt%) of 0, 0.5, 1.0, 1.5, 2.0 and 2.5 of B4C and BN nanoparticles were prepared by ultrasonic-assisted stir casting technique. For the prepared composites, the microhardness and the tribological characteristics were reported. The wear behavior was determined under normal loads of 10, 20, 30 and 40 N and at sliding speeds of 0.5, 1.0 and 1.5 m/s, respectively. The results showed an increase in wear resistance and decrease in friction coefficient with the addition of the nanoparticles. The wear rate and friction coefficient increased with increase in normal load and sliding speed. The scanning electron microscope (SEM) images revealed uniform dispersion of the reinforcement particles in the composite. The wear specimens showed adhesion and plowing behavior at lower loads and delamination at higher load. Keywords Nanocomposites Tribological properties Aluminum metal matrix Boron carbide Boron nitride
1 Introduction Aluminum metal matrix nanocomposites (AMMNCs) are the advanced materials with fast growing demand because of their excellent attractive properties such as low density, & Gopichand Dirisenapu [email protected] 1
Department of Mechanical Engineering, Jawaharlal Nehru Technological University, Kakinada, India
2
Department of Mechanical Engineering, Lakireddy Balireddy College of Engineering (A), Mylavaram, India
corrosion resistance, extraordinary strength, better thermal conductivity, etc. Because of their high strength-to-weight ratio, these are used in defense, military, aerospace and automotive industries [1]. The researchers around the globe focused on enhancing the wear resistance of the aluminum alloy with the addition of the hard ceramic particles [2]. To improve the wear resistance and coefficient of friction (COF), particles such as TiC, Al2O3, SiC, BN, TiO2, B4C, MoS2, WC, Si3N4, and TiB2 are added to aluminum alloys [3]. Among these particles, the addition of B4C enhances the interfacial bonding with the base metal and contributed to increase in wear resistance. The B4C also has an exceptional neutron-absorbing characteristics, high strength, low density, which made it suitable for nuclear and aerospace industry [4]. On the other hand, the boron nitride (BN) is a solid lubricant and the addition of it to aluminum alloy improves the self-lubricating nature and toughness of composites. Some investigations revealed that the tribological and mechanical behavior of the aluminum matrix improved with the addition of BN nanoparticles [5]. Rao et al. observed the effect of SiC particles on the wear properties of aluminum matrix (Al7010, Al7009 and Al2024) under the cons
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