Tribology characteristics of magnesium alloy AZ31B and its composites |
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| Affiliation: | 1. Department of Mechanical Engineering, Mookambigai College of Engineering, Pudukkottai, Tamilnadu 622502, India;2. Syed Ammal Engineering College, Ramanathapuram, Tamilnadu 623502, India;3. Department of Production Engineering, National Institute of Technology, Tiruchirappalli, Tamilnadu 620015, India;4. Department of Mechanical Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117576, Singapore;5. Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai, Tamilnadu 600036, India;1. Department of Mechanical Engineering, Engineering Design Division, CEG Campus, Anna University, Chennai 600025, India;2. Center for Nanoscience and Technology, Anna University, Chennai 600025, India;1. College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China;2. National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing 400044, China;3. Chongqing Academy of Science and Technology, Chongqing 401123, China;4. School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China;1. Department of Mechanical Engineering, Indian Institute of Technology – Delhi, Delhi 110016, India;2. Department of Mechanical Engineering, Kongu Engineering College, Perundurai 638052, India;3. School of Mechanical Engineering, KIIT University, Bhubaneswar, Odisha, 751024, India |
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| Abstract: | In this paper, wear characteristics of magnesium alloy, AZ31B, and its nano-composites, AZ31B/nano-Al2O3, processed by the disintegrated melt deposition technique are investigated. The experiments were carried out using a pin-on-disk configuration against a steel disk counterface under different sliding speeds of 1, 3, 5, 7 and 10 m/s for 10 N normal load, and 1, 3 and 5 m/s for 30 N normal load. The worn samples and wear debris were then examined under a field emission scanning electron microscopy equipped with an energy dispersive spectrometer to reveal its wear features. The wear test results show that the wear rates of the composites are gradually reduced over the sliding speed range for both normal loads. The composite wear rates are higher than that of the alloy at low speeds and lower when sliding speed further increased. The coefficient of friction results of both the alloy and composites are in the range of 0.25–0.45 and reaches minimums at 5 m/s under 10 N and 3 m/s under 30 N load. Microstructural characterization results established different dominant mechanisms at different sliding speeds, namely, abrasion, delamination, oxidation, adhesion and thermal softening and melting. An experimental wear map was then constructed. |
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| Keywords: | Sliding wear Metal–matrix composite Electron microscopy Wear testing |
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