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Scandium (Sc) is an expensive alloying element which has an important effect on the properties of aluminum alloys. It is of interest to determine for a variety of solidification conditions the effect of minor addition, in the hypoeutectic levels, of Sc on Al alloys. This study builds on past work on rapid and slow solidification of Al-4.5Cu-0.4Sc (wt%) by comparing previous microstructures to those obtained using spray forming of strip. The effect of Sc (0.4 wt%) on the scale of the microstructure of as-atomised powders and as-deposited strips (SD) is found to be negligible in the investigated alloys. The eutectic undercooling of the Al-4.5Cu-0.4Sc (wt%) alloy is the same for both powders and SD. This is attributed to eutectic nucleation and growth following the same path in both solidification processes, characterised by an extended solubility of Sc in the primary α-Al matrix, as evidenced by the resulting Sc-rich precipitates and inherent age hardening upon annealing of the as-solidified samples. This work contributes to building an understanding of rapidly cooled structures and their subsequent self-aging in advanced manufacturing processes.

canadian metallurgical quarterly

On the role of Sc in powders and spray deposits of hypoeutectic Al-Cu À propos du rôle de Sc dans les poudres et les revêtements par projection d’Al-Cu hypoeutectique