Effect of high power diode laser surface melting on wear resistance of magnesium alloys |
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| Affiliation: | 1. School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Iran;2. Department of Mechanical and Mechatronics Engineering, University of Waterloo, Canada;3. Department of Materials and Manufacturing, Jonkoping University, Sweden;1. School of Mechanical Engineering & Automation, Beihang University, Beijing 100083, China;2. School of Biological Science and Medical Engineering, Beihang University, Beijing 100083, China;3. National Engineering Laboratory of Additive Manufacturing for Large Metallic Components, Beihang University, 37 Xueyuan Road, Beijing 100083, China;4. Hefei Innovation Research Institute of Beihang University, Xinzhan Hi-tech District, Anhui, 230013, China |
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| Abstract: | In the present work, an attempt has been made to improve the surface hardness and wear properties of magnesium alloys AZ31 and AZ61 through solid solution hardening and refinement of microstructures using a 1.5 kW high power diode laser (HPDL) as a heat generating source. One millimetre thick uniform overlapping melt tracks were produced on Mg alloy samples. Laser-melted samples were subjected to a two-body abrasive wear test using a modified pin-on-disc set up. The hardness and wear resistance of laser-melted samples were found far better than the as-received Mg alloy substrates. Scanning electron microscopy was used to examine microstructure of the laser-melted layers and the worn surface morphology. Fine microstructures were observed with an average grain size of less than 5 μm. |
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