Effect of pouring temperature on microstructure and mechanical properties in Al-16Si-2%Al2O3 hypereutectic alloys

Abstract

The Al-Si hypereutectic alloys are taking vital role in day to day life and industrial applications for its excellent microstructural and mechanical properties. The grain size, volume fraction and distribution of both primary as well as eutectic silicon enhances significantly on these properties among the materials. The modification of primary and secondary Si particles in hypereutectic Al-Si alloys is quite difficult in conventional processes. This paper investigates the microstructural and mechanical properties changes as changing in pouring temperature. During solidification, the effect of pouring temperature on primary and secondary Si particles is showing the vital role in hypereutectic Al-16Si-2%Al2O3 alloy. In order to achieve better microstructure and mechanical properties, the interfacial bonding between the dispersed phase and liquid matrix was good in the synthesized composites produced by casting route over other conventional processes. The cast product of hypereutectic Al-16Si alloy shows significant variation over wear behaviour and hardness at different pouring temperatures. However in XRD analysis of sample indicating the formation of harder phases like SiO2, Al2O3 and Al-rich intermetallic compounds. � 2019 Elsevier Ltd. All rights reserved.