Abstract
The grain structure, age hardening response, precipitate structure and tensile properties of AA8090 alloy plate without and with minor additions of Sc were investigated. Primary aluminide particles were present in all alloys. Sc additions ⩾0.43% resulted in refinement of the as-cast grain structure. Further investigations on 0.11% and 0.22% Sc containing alloys showed that the subgrain size was finer while the number density of nano-scale Al 3(Sc,Zr)/Al 3Li composite precipitates and the artificially aged hardness were higher for the Sc containing alloys. There was a marginal increase in the yield strength with a concomitant reduction in ductility with increasing Sc content in the alloys.
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