Microstructural Characterisation by Scanning Electron Microscopy of Spray Formed Al/SiC_p Matrix Composite

摘要

The material used in this work was produced by spray forming AA7475 aluminium alloy and co-depositing silicon carbide particles (20% volume fraction). The spray formed composite billets were hot extruded into round bars. The microstructure was examined in the as received and heat treated (annealed, aged, and overaged) conditions by scanning electron microscopy. Scanning electron microscopy revealed an extensive Mg_2Si phase precipitation at the Al/SiC_p interface due probably to Mg segregation from the matrix to the interface, during the heat treatments.