The Structure and Properties of Wrought Al–Mg–Sc Aluminum Alloys with Different Scandium Content
I. Benarieb, N.V. Dynin, Д. В. Зайцев, С. В. Сбитнева
Abstract
Abstract Round ingots 110 mm in diameter and cold-rolled sheets 2 mm in thickness, which were made of experimental Al–Mg–Sc alloys containing with different scandium content (0.07, 0.20 wt %), have been studied. Transmission electron microscopy and thermodynamic simulation have been used to investigate the peculiarities of the structural-phase state of the material. A reduction in scandium content from 0.20 to 0.07% has been found to result in a twofold increase in the grain size in ingots, a 46% drop in hardening of ingots after homogenization, and a 10–20% decrease in the strength of annealed sheets, which has been caused by a smaller amount of the key phase, Al3(Sc, Zr). A good level of strength characteristics of experimental annealed sheets made of alloy with low scandium content 0.07 wt % (σu > 400 MPa, σ0.2 > 300 MPa) has been achieved and it is higher than that of the traditional AMg6 alloy (σu > 350 MPa, σ0.2 > 150 MPa).