Abstract
In this study, the dry sliding wear behaviors of SiC particle reinforced AZ91D matrix composites fabricated by stirring casting method were systematically investigated. The SiC particles in as-cast composites exhibited typical necklace-type distribution, which caused the weak interface bonding between SiC particles and matrix in particle-segregated zones. During dry sliding at higher applied loads, SiC particles were easy to debond from the matrix, which accelerated the wear rates of the composites. While at the lower load of 10 N, the presence of SiC particles improved the wear resistance. Moreover, the necklace-type distribution became more evident with the decrease of particle sizes and the increase of SiC volume fractions. Larger particles had better interface bonding with the matrix, which could delay the transition of wear mechanism from oxidation to delamination. Therefore, composites reinforced by larger SiC particles exhibited higher wear resistance. Similarly, owing to more weak interfaces in the composites with high content of SiC particles, more severe delamination occurred and the wear resistance of the composites was impaired.
Highlights
The development and application of high-strength and light-weight metallic materials have received much attention in recent years owing to the increasing concerns of world environmental issues, such as air pollution, energy overconsumption, resource shortage, etc
Estimation demonstrated that the sizes and volume fractions of silicon carbide (SiC) particles in the images are in good agreement with experimental design
It can be seen that SiC particles with finer sizes and higher volume fractions were more inclined to be aggregated at grain boundaries, namely, much easier to form necklace-type distribution
Summary
The development and application of high-strength and light-weight metallic materials have received much attention in recent years owing to the increasing concerns of world environmental issues, such as air pollution, energy overconsumption, resource shortage, etc. Among various light-weight metallic materials, magnesium and its alloys exhibit great potential because of their low density, high specific strength and stiffness, good machinability, and so on, which were considered as the generation of green engineering structural materials [1,2,3,4,5]. Magnesium matrix composites were often produced by the stirring casting method due to its high production rate and low processing cost. Studies showed that the particulate reinforced magnesium matrix composites prepared by stirring casting often exhibited typical necklace-type distribution of particles [17,18,19].
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