A novel method of coating ex-situ SiC particles with in-situ SiC interlayer in Al-Si-C alloy.

For SiC p /Al composites, the stability of the interface between SiC particles (SiC p ) and matrix is crucial. A novel method, in-situ coating of ex-situ SiC p , is developed in hypereutectic Al-Si alloys within this research. The microstructure, growth mechanism and strengthening behavior of the ex-situ SiC p with in-situ SiC coating were studied. Microstructure observation shows that due to the formation of in-situ coating, the interfacial bonding of ex-situ SiC p and matrix is improved. Further research reveals the epitaxial growth character of the in-situ SiC coating which has the same structure with ex-situ SiC p . The ex-situ SiC p with in-situ SiC coating is easily introduced into complex Al-Si alloys and the tensile strength of the alloy at both room temperature and 350 °C is improved remarkably. [ABSTRACT FROM AUTHOR]