Evolution of microhardness during isochronal annealing up to 600 °C was studied in strips processed from Al-Mg-Sc-Zr alloy. Specimens for all measurements were prepared from conventionally mould cast and hot rolled strips (CC) or from strips after twin-roll casting (TRC). Selected TRC specimens were further either hot rolled or constrained groove pressed. The role of strips preparation methods on microhardness and annealing response was established. It was shown that the formation of coherent Sc and Zr-rich particles at temperatures close to 300 °C results in a significant increase of microhardness in specimens that have not been exposed to elevated temperatures during the preparation of strips. The highest microhardness was observed in CC materials as a result of a combined effect of fine grains and strengthening particles. Above 350 °C a degradation of mechanical properties occurs in two stages in all materials independently on their previous history. The observed drop of microhardness was caused by the overaging of strengthening particles and withdrawal of the strengthening effect of the deformation structure.Keywords: Aluminum alloys, metal sheets, preparation, severe plastic deformation, annealing
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