Abstract
The article presents the results of experimental studies of the structure and mechanical properties of cast and microcrystalline (MC) aluminum alloys Al-(2.5, 4)%Mg-Sc-Zr with a total content of Sc+Zr = 0.32%. The Sc content was varied from 0.10% to 0.22% at an interval of 0.02%, with the Zr concentration in the alloy being changed proportionally. In their initial state, cast alloys are characterized by a homogeneous coarse-grained macrostructure. The structure of the alloy structure presents single submicron particles Al3 (Sc,Zr) that are formed during crystallization of the alloys. It has been demonstrated that the recrystallization onset temperature in MC alloys depends on the scandium-to-zirconium ratio.
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