The Structure and Properties of Wrought Al–Mg–Sc Aluminum Alloys with Different Scandium Content

• Published in: Physics of metals and metallography 2023, Vol.124 (1), p.65-73
• Main Authors: Benarieb, I., Dynin, N. V., Zaitsev, D. V., Sbitneva, S. V.
• Format: Article
• Language: English
• Subjects: Alloys; Aluminum; Aluminum alloys; Aluminum base alloys; Analysis; Annealing; Chemistry and Materials Science; Diameters; Diffusion; Grain size; Ingots; Magnesium base alloys; Materials Science; Metallic Materials; Phase Transformations; Rare earth metals; Scandium; Sheets; Specialty metals industry; Structure; Thermodynamics; Zirconium
• ISSN: 0031-918X; 1555-6190
• DOI: 10.1134/S0031918X22601639

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, Al 3 (Sc, Zr). A good level of strength characteristics of experimental annealed sheets made of alloy with low scandium content 0.07 wt % (σ u > 400 MPa, σ 0.2 > 300 MPa) has been achieved and it is higher than that of the traditional AMg6 alloy (σ u > 350 MPa, σ 0.2 > 150 MPa).