Optimization of Wear Behavior of Magnesium Alloy AZ91 Hybrid Composites Using Taguchi Experimental Design
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INTRODUCTION
METAL matrix composites (MMCs) have gained their importance over conventional alloys in high strength and stiffness applications in industries like aerospace, automobile, and mineral processing. The mechanical and tribological properties are improved by addition of reinforcement phase such as hard ceramic particles or fibers which are uniformly distributed in the soft matrix phase. The composite materials have emerged as the important class of advanced materials giving engineers the opportunity to tailor the material properties according to their needs. Basically these materials differ from the conventional engineering materials from the viewpoint of homogeneity. Particulate metal matrix composites are the most commonly manufactured by melt incorporation and stir casting technique. These properties along with good specific strength and modulus make them good materials for many engineering situations where sliding contact is expected. B.M. GIRISH, formerly with the Department of Mechanical Engineering, East Point College of Engineering and Technology, Bangalore, Karnataka 560049, India, is now Professor and Head with the Department of Mechanical Engineering, Alliance College of Engineering and Design, Alliance University, Chandapura-Anekal Road, Anekal, Bangalore, Karnataka 562106, India. Contact e-mail: [email protected] B.M. SATISH, Professor, is with the Department of Mechanical Engineering, East Point College of Engineering and Technology. SADANANDA SARAPURE, formerly with the Acharya College of Engineering, Bangalore, India, is now Professor with the Department of Mechanical Engineering, Shinas College of Technology, Al-Aqur, Shinas, Sultanate of Oman. BASAWARAJ, formerly with the Department of Mechanical Engineering, East Point College of Engineering and Technology, is now Professor with the Department of Aerospace Propulsion Technology, Center for Post-Graduation Studies, Bangalore Region, Visvesvaraya Technological University, Muddenahalli, Karnataka 562101, India. Manuscript submitted February 9, 2015. Article published online March 22, 2016 METALLURGICAL AND MATERIALS TRANSACTIONS A
Magnesium alloys have become promising materials for industrial, structural, and transport applications due to their attractive properties such as low density, high specific strength, damping capacity, and good electrical and thermal conductivity. AZ91D is one of the widely used magnesium alloys and it possesses a good combination of mechanical and physical properties. Once a material is chosen for a certain application, degradation testing is generally required as a function of the expected service environment. The degradation of material generally occurs via corrosion, fatigue, and wear. Considerable studies have been carried out to understand corrosion resistance[1–3] and fatigue behavior[4] of AZ91D alloy. However, only a few studies have been carried out on friction and wear behavior of the alloy,[5–7] and hence in the present study, an attempt is made to address the same. Wear is a major concern when AZ91D alloy
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