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Influence of Sr, Fe and Mn content and casting process on the microstructures and mechanical properties of AlSi7Cu3 alloy

type de publication      article dans une revue internationale avec comité de lecture
date de publication 2017
auteur(s) Li Zaido; Limodin Nathalie; Tandjaoui Amina; Quaegebeur Philippe; Osmond Pierre; Balloy David
journal (abréviation) Materials Science and Engineering: A (Mater Sci Eng)
volume (numéro) 689
pages 286 – 297
résumé The effects of Strontium (Sr), Iron (Fe) and Manganese (Mn) additions, casting process (i.e., cooling rate) on the microstructures and mechanical properties of AlSi7Cu3 alloy were investigated. 2D and 3D metallographic and image analysis have been performed to measure the microstructural changes occurring at different Sr, Fe and Mn levels and casting process. The evolution of mechanical properties of the alloys has been monitored by Brinell and Vickers hardness measurement and tensile tests. Addition of Sr slightly refines the eutectic silicon particles but it also introduces more pores. The combined addition of Fe and Mn induces an increase of Fe-rich intermetallic compounds which include both α-Al15(Fe,Mn)3Si2 and β-Al5FeSi phase, while the volume fraction of porosity decreases with the Fe and Mn content increase. The secondary dendrite arm spacing slightly decreases with the addition of Sr, Fe and Mn alloying elements.
mots clés Casting aluminium alloys; Microstructure; Mechanical characterization; Microanalysis; Tomography
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