Processing effect of Powder-chip based reinforcement in AA6061 Semi solid cast composite

Abstract

Powder-chip based reinforcement and pouring temperature are the two factors for the internal cooling and shrinkage. The objective of this work was to experimental study to the effect of casting factors for aluminum based cast material inoculates with solid chips. The casting factors such as pouring temperature and reinforcement made by a combination of powder and waste chips for the processing in the semi-solid stage were investigated. The results indicate that these factors affect the behavior of microstructure properties of the cast composite in semi-solid stage. Pouring temperature is the factor that has the main influence on the behavior of the slurry with a marginal effect of reinforcement to most satisfactory results from a microstructural view point. Microstructures of the cast surfaces at various locations showed the incorporation of solid particles in un-melted conditions. Whereas, a parameter RIF (Reinforcement Incorporation Factor) value also confirms the potential of the processing in which this value reaches to 0.96 closer to 1. Fine microstructure of the cast composite inside the cavities also confirms the dendrites of about 200nm due to effect of powder.