Role of matrix alloy chemistry on the interfacial reaction and solidification of metal matrix composites

Abstract

Equilibrium Si content required to suppress the interfacial reaction in 2124 Al/SiC and A356 Al/SiC has been thermodynamically predicted by combining Wilson equation with the Miedema model. In 2124 Al/SiC composites, good agreement between thermodynamically calculated and experimental result has been observed in the solid and semi solid state reaction. At higher temperature above 750 o C, thermodynamically calculated results are much higher than that of experimental values. Strong influence of reinforcement size and volume fraction on the extent of interfacial reaction is also observed in 2124 Al/SiC composites. In these composites, formation of protective layer of Al 4 C 3 crystals over SiC surface plays significant role in predicting the equilibrium Si content. The influence of reinforcement particle size and volume fraction on the extent of reaction has not been observed in A356 Al/SiC composites and irrespective of reaction temperature the thermodynamically calculated equilibrium Si contents for A356 Al/SiC composites agrees well with the experimental results.

Explicit microstructural evolution and electrochemical performance of value added palm kernel shell ash nanoparticle/A356 alloy composite

“…The coating of silica on the surface of SiCp to solve the problem of reaction between aluminium and SiCp was reported by [10]. They found out that the coating prevented the formation of Al 4 C and enhanced wettability of SiCp in aluminum.…”

Selection of Reinforcing Phases for Aluminum Matrix Composites Using Thermodynamic Stability Criterion

“…In this regard, to select the composition of the matrix and the reinforcing phases, it is advisable to apply a criteria-based approach that allows filtering out obviously incompatible or undesirable components [11]. Since aluminum matrix composites consist of heterogeneous components, the issues of chemical and physical compatibility of these components are crucial in the design of composites and products from them taking into account operating conditions, as well as in the development of technological processes for their production [12][13][14]. In this regard, the screening of components requires the development of reliable and adequate criteria, allowing to take into account the contribution of various components to the required level of a particular property, as well as the compatibility of the matrix and potential reinforcing phases.…”