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Microstructural evolution in ultrasonically processed in situ AZ91 matrix composites and their mechanical and wear behavior
Highlights In situ ultrasonically processed AZ91 matrix composites are made with Si additions. Mechanisms of microstructural refinement are discussed. Improved dispersion of the reinforcement is observed upon ultrasonication. Mechanical and sliding wear properties were improved. Abrasion is found to be the dominant wear mechanism.
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.
Microstructural evolution in ultrasonically processed in situ AZ91 matrix composites and their mechanical and wear behavior
Highlights In situ ultrasonically processed AZ91 matrix composites are made with Si additions. Mechanisms of microstructural refinement are discussed. Improved dispersion of the reinforcement is observed upon ultrasonication. Mechanical and sliding wear properties were improved. Abrasion is found to be the dominant wear mechanism.
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.
Microstructural evolution in ultrasonically processed in situ AZ91 matrix composites and their mechanical and wear behavior
Muley, Sachin Vijay (author) / Singh, Satya Prakash (author) / Sinha, Piyush (author) / Bhingole, P.P. (author) / Chaudhari, G.P. (author)
2013-07-17
7 pages
Article (Journal)
Electronic Resource
English
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