Microstructural Evaluation of Inductively Sintered Aluminum Matrix Nanocomposites Reinforced with Silicon Carbide and/or
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MAD ISLAM and IFTIKHAR AHMAD are with the Center of Excellence for Research in Engineering Materials, Deanship of Scientific Research, King Saud University, P.O. Box 800, Riyadh 11421, Saudi Arabia. Contact e-mails: [email protected], [email protected] YASIR KHALID is with the Institute of Energy Technologies and Centre for Research in Nanoengineering, Universitat Polite`cnica de Catalunya, Barcelona, Spain. ABDULHAKIM A. ALMAJID is with the College of Engineering, Prince Sultan University, P.O. Box 66833, Riyadh 11586, Saudi Arabia and also with the Department of Mechanical Engineering, College of Engineering, King Saud University, P.O. Box 800, Riyadh 11421, Saudi Arabia. AMINE ACHOUR is with the University of Namur, Research Centre in Physics of Matter and Radiation (PMR), LISE Laboratory, 5000 Namur, Belgium. THERESA J. DUNN is with the Department of Materials and Metallurgical Engineering, New Mexico Institute of Mining & Technology, Socorro, NM 87801. AFTAB AKRAM is with the School of Chemical and Materials Engineering, National University of Sciences and Technology, Islamabad 44000, Pakistan. SAQIB ANWAR is with the Department of Industrial Engineering, College of Engineering, King Saud University, P.O. Box 800, Riyadh 11421, Saudi Arabia. Manuscript submitted December 1, 2017.
METALLURGICAL AND MATERIALS TRANSACTIONS A
INTRODUCTION
OWING to its low density, precipitation strengthening capability, good corrosion resistance, high thermal and electrical conductivities, and high damping capacity, aluminum (Al) is the most popular choice as a matrix for the composite materials. Aluminum matrix composites (AMCs) refer to the class of light-weight, high-performance systems, in which a suitable reinforcement such as fibers, platelets, or particulates in volume fractions ranging from a few pct up to 70 pct are added to an aluminum matrix.[1–6] Depending on the type and content of the reinforcement and the processing route, the AMCs can be produced with tailored properties such as low specific density, high specific stiffness, low coefficient of thermal expansion, good thermal conductivity, good dimensional stability, and excellent strength-to-weight ratio for critical applications such as automotive and railway brake disks as well as in spacecraft structures.[7]
The addition of silicon carbide (SiC) particulates into the Al matrix leads to the increased levels of tensile modulus and strength, strength-to-weight ratio, wear resistance, thermal stability, and effective load-carrying capacity.[8] Although SiC particle size does not affect the fatigue behavior at elevated temperatures (> 150 C), yet a relatively fine size of 5 lm has been found to improve fatigue strength through superior resistance to crack initiation at ambient temperatures.[9] Several factors including size, morphology, and weight or volume fraction of the SiC particulates[10] as well as wear test conditions such as applied load,[11,12] sliding velocity,[13] temperature, and time influence the active wear mechanism and the material loss rate.[14]
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