The addition of a small amount of Sc to aluminum alloys improves their properties, such as strength, heat resistance, welding characteristics, decrease grain size. The beneficial role of Sc is attributed to a high density of coherent precipitates of the Al₃Sc phase formed during decomposition of the solid solution at temperatures between 300 and 550°C. Alloying with Zr in addition to Sc improves both the grain-refining efficiency and thermal stability of the alloys. In the present work the phases and the sequences of their precipitation in Al-1%Mg-0.6%Si (in wt %) alloy with Sc and Zr additions has been studied. Two-step heat treatment was applied: the annealing in the temperature 350°C following by quenching from 540°C. Precipitation of the β′ (Mg₂Si), cubic β (Mg₂Si) and Al₃(Sc,Zr) phases have been observed during the first step of annealing. Annealing at 540°C has led to dissolution of the Mg₂Si precipitates and growing the particles of the Al₃(Sc,Zr) phase. Analytical transmission electron microscopy and high resolution microscopy have been applied for the identification of phases, determination of particle sizes, their distribution and relationship between the phases.

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