Investigating the effect of porosity on aluminium 7075 alloy reinforced with silicon nitride (Si3N4) metal matrix composites through STIR casting process

Aluminium 7075 alloy was reinforced with silicon nitride (Si3N4) in the range of 4%, 8% and 12% were fabricated using stir casting route. Casted specimens are heat-treated at various conditions to eliminate the Porosity and X-ray computed tomography and image analyzer techniques were used to measure the Porosity in casting. Further, the casted specimens were tested for chemical composition using Spectro analysis; micro image and micro-hardness are conducted. Dispersion of Si3N4 in Al alloy was observed using a scanning electron microscope. (C) 2020 The Authors. Published by Elsevier Ltd.

Automated summary

In this study, aluminium 7075 alloy reinforced with silicon nitride (Si3N4) at 4%, 8%, and 12% was fabricated using stir casting route. The casted specimens underwent heat treatment to eliminate porosity, and various tests were conducted to analyze the chemical composition, microstructure, and hardness. The dispersion of Si3N4 in the aluminium alloy was observed using a scanning electron microscope.