Channappagoudar, S.Sannayallappa, N.Desai, V.Venkateswarlu, V.2026-02-052015International Journal of Materials Research, 2015, 106, 8, pp. 962-96918625282https://doi.org/10.3139/146.111270https://idr.nitk.ac.in/handle/123456789/26246Microstructure, tensile strength and dry sliding wear studies of Al-15Si, Al-15Si-4.5Cu alloys with and without grain refinement and modifications are presented. Experimental alloys such as Al-15Si and Al-15Si-4.5Cu were conventionally melted and gravity die cast. For grain refinement, 1 wt.% of Al-1Ti-3B and for modification, 0.17 wt.% of aluminum phosphide (AlP) and 0.4 wt.% of Al-10Sr were added to the alloy melt. The results reveal refined microstructure due to grain refinement, modification, improved hardness, higher tensile strength and better sliding wear. Moreover, Al-15Si-4.5Cu alloy (untreated and treated) showed improved mechanical properties as compared to conventional hypereutectic Al-Si alloy. © Carl Hanser Verlag GmbH & Co. KG.Binary alloysCopper alloysGrain refinementGrain size and shapeMicrostructureSiliconSilicon alloysTensile strengthAluminum phosphidesDry sliding wearExperimental alloysHypereutectic Al-Si alloysModificationRefined microstructureSi alloysSliding wearAluminum