“ Microstructural and mechanical properties of eutectic Al – Si alloy with grain refined and modified using gravity - die and sand casting ”

This paper attempts to investigate the influence of the microstructure and mechanical property changes on sand casting and permanent die casting alloys by grain refinement, modification combined action of both (Al– 3Ti–1B + Al–10Sr) and without grain refinement and modification effect. The microstructures of the castings are studied by optical microscopes. The microstructure and mechanical properties (tensile strength, hardness and impact strength) was tested of as cast, treated (grain refined and modified) samples. The test results are shown improvement in mechanical properties in treated melt by sand casting and permanent die casting than cast alloy due to this change was due to improvement in grain size and microstructure, and comparison microstructure and mechanical property with each other. KeywordsGrain Refinement, Modification, Al-Si alloy, Microstructure, tensile, hardness, impact.