Structure and properties of Al–Mg alloys depending on scandium and zirconium additions and production methods

Abstract

The paper examines how scandium and zirconium doping of Al–Mg alloys produced by conventional casting and powder metallurgy methods influences their structure and mechanical properties. It is shown that Al–Mg powder alloys are not recrystallized in the plastic deformation process and subsequent heating to 550°C. In cast 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 with scandium and zirconium increases their strength by 80−120%. Doped powder alloys have much greater strength than cast alloys and quite high plasticity.