Structure and Properties of AlMg3 Alloy with Sc and Zr

Abstract

The present contribution deals with the effect of thermal and mechanical treatment on structure, mechanical and physical properties of as cast, cold and hot worked AlMg3 type alloy produced by conventional casting, as well as by powder metallurgy. The properties of the AlMg3 alloys with additions of Sc and Zr in the weight concentration ranges 0.14 – 0.29% and 0.05 – 0.12% respectively were studied and compared with those of the alloys without Sc and Zr additions. The anti-recrystallization effect, phase development and mechanical properties investigated in the course of isothermal as well as isochronal annealing were studied by using optical and transmission electron microscopy, electrical resistometry and hardness measurements. The parameters of technological procedure of optimum age hardening by the Al3(ScxZr1-x) phase are presented. This optimum can not be reached if the as cast alloy is exposed to temperatures higher than 350°C. Even the small additions of Sc such as 0.15 wt. % ensure the anti-recrystallization effect of Al3(ScxZr1-x) phase.