Effect of Scandium and Zirconium Doping and Production of Al–Mg Alloys on Their Structure and Properties

Abstract

The paper investigates the influence of scandium and zirconium doping of Al–Mg alloys produced by the conventional casting method (LM) and powder metallurgy method (PM) on the structure and mechanical properties. It is shown that the Al–Mg alloys produced by the PM method are not recrystallized in the plastic deformation process and subsequent heating to 550 °С. In LM alloys, recrystallization begins even in the extrusion process. Additions of scandium, zirconium, and chromium restrain the recrystallization of alloys when heated to 550 °C. Doping of Al–Mg alloys by scandium and zirconium increases the strength of the developed alloys by 80−120%. The doped PM alloys have much greater strength than LM alloys and quite high plasticity.