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Modelling Dispersoid Precipitation in Scandium Containing Aluminium Alloys

A model for precipitation of binary and ternary Ll 2 dispersoids in aluminium alloys has been used to compare the precipitation kinetics of Al 3 Sc. Al 3 Zr, Al 3 (Sc,Zr), and Al 3 (Sc,Ti). Scandium, which is a faster diffuser that titanium or zirconium, accelerates dispersoid precipitation. Scandium additions, even at levels as low as 0.03wt% are predicted to significantly enhance dispersoid precipitation in conventional 7xxx alloys and improve the particle distribution. Precipitation in the Al 3 (Sc,Ti) system is predicted to be much slower than in the Al 3 (Sc,Zr) system due to the slower diffusivity and greater solubility of Ti compared to Zr.