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

Zaidao Li (1, 2) , Nathalie Limodin (2) , Amina Tandjaoui (2) , Philippe Quaegebeur (2) , Pierre Osmond (3) , David Balloy (1)

1 UMET - Unité Matériaux et Transformations - UMR 8207
2 LML - Laboratoire de Mécanique de Lille - FRE 3723
3 PSA - PSA Peugeot - Citroën

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; casting aluminium alloys; microstructure; mechanical characterization; microanalysis; tomography; Casting aluminium alloys

Domaines: Matériaux

Zaidao Li, Nathalie Limodin, Amina Tandjaoui, Philippe Quaegebeur, Pierre Osmond, et al.. Influence of Sr, Fe and Mn content and casting process on the microstructures and mechanical properties of AlSi7Cu3 alloy. Materials Science and Engineering: A, 2017, 689, pp.286-297. ⟨10.1016/j.msea.2017.02.041⟩. ⟨hal-03671549⟩