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

作者:Wu, Chongchong; Gao, Tong; Sun, Qianqian; Liu, Guiliang; Du, Xiaofan; Liu, Xiangfa*
来源:Journal of Alloys and Compounds, 2018, 754: 39-47.
DOI:10.1016/j.jallcom.2018.04.306

摘要

For SiCp/Al composites, the stability of the interface between SiC particles (SiCp) and matrix is crucial. A novel method, in-situ coating of ex-situ SiCp, is developed in hypereutectic Al-Si alloys within this research. The microstructure, growth mechanism and strengthening behavior of the ex-situ SiCp with insitu SiC coating were studied. Microstructure observation shows that due to the formation of in-situ coating, the interfacial bonding of ex-situ SiCp 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 SiCp. The ex-situ SiCp 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 degrees C is improved remarkably.