Microstructure And Corrosion Performance Of Aluminium Matrix Composites Reinforced With Refractory High-Entropy Alloy Particulates
Elias Ananiadis, Konstantinos T. Argyris, Theodore E. Matikas, Athanasios K. Sfikas and Alexandros E. Karantzalis prove corrosion behaviour of produced composites is controlled by the matrix corrosion.
Metal matrix composites (MMCs) comprise metallic matrix with ceramic or metallic reinforcement. Exhibiting high strength, modulus, hardness, and improved tribological properties, MMCs replaced monolithic alloys in aerospace and transportation.
A variety was developed with different matrices like aluminium (Al), copper (Cu), and stainless steel. Aluminium matrix composites (AMCs) reinforced with various particulates including Al2O3, SiC, TiC, and B4C were studied.
Studies on AMCs’ electrochemical properties reinforced with various ceramic reinforcements, including Al2O3/SiC, B4C, SiC, and AlN, indicated composites exhibit decreased corrosion resistance compared to monolithic alloy. This is from continuous passive film on matrix–reinforcement interface’s breakdown, formation of galvanic couples between Al and reinforcement, voids at matrix–reinforcements interfaces, interfacial layers around the reinforcement promote galvanic effect, and up the dislocation density around particles clusters.
Al-based composites’ decreased corrosion resistance compared to monolithic alloys is from pitting corrosion at interfaces between reinforcing particulates, secondary precipitates, and reduced oxygen on cathodic particles and precipitates. Introducing reinforcement in the Al matrix leads to improved corrosion performance.
Formation of reaction products acting as barriers, interrupting matrix channel continuity, and decoupling matrix/reinforcement improve corrosion performance. Other researches revealed AMCs exhibited comparable corrosion resistance with monolithic alloy.
The reinforcement effect on AMCs’ corrosion performance vary from environment and processing route. Other factors modifying corrosion behaviour include primary interfacial reaction products between matrix/reinforcement, secondary precipitates as cast and heat-treated states, aging kinetics, and electrolyte type.
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