Microstructural evolution in ultrasonically processed in situ AZ91 matrix composites and their mechanical and wear behavior |
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| Affiliation: | 1. Metallurgy of non-ferrous metals of NUST \"MISiS\", Moscow, Russia;2. Metallurgy of non-ferrous metals and Gold of NUST \"MISiS\", Moscow, Russia;3. Intermiks Met, Moscow, Russia;1. School of Materials Science and Engineering, Harbin Institute of Technology (HIT), Harbin, China;2. School of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin, China;3. Harbin Turbine Company Limited, Harbin, China;4. College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin, China;1. Department of Physics, King’s College London, Strand, London WC2R 2LS, UK;2. Materials Research Centre, College of Engineering, Swansea University, Singleton Park, Swansea SA2 8PP, UK;1. Department of Printed Electronics Engineering, Sunchon National University, Suncheon, South Korea;2. School of Engineering and Material Science, Queen Mary University of London, London E1 4NS, UK |
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| Abstract: | AZ91 alloy matrix composites reinforced with phases formed in situ from the addition of Si particles were fabricated by solidification under ultrasonic vibrations. Application of high-intensity ultrasonic field to the melt resulted in optimized size, morphology and distribution of in situ formed Mg2Si particles. The amount of Mg2Si particles increased, its size was refined and the distribution became uniform. Heterogeneous nucleation from the addition of silicon particles and enhanced nucleation from rapid cooling refined the grain size of the matrix in the composites. Hardness and ultimate compressive strength of the composites increased as compared to that of the cast AZ91 alloy. Composites exhibited improved sliding wear behavior of under varying normal loads. Identified dominant wear mechanism at lower sliding velocities is abrasion. Improvement in mechanical and sliding wear properties of the composites is attributed to the refinement of both matrix and reinforcement phases and improved dispersion of the reinforcement under ultrasonic vibrations. |
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| Keywords: | Magnesium alloys Solidification Grain refinement Nucleation Wear |
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