Comparative analysis of the effect of magnesium and zinc on the structure and mechanical properties of hot-rolled and cold-rolled alloy Al–2%Cu–1.5%Mn sheets

• Published in: Metallurgist (New York) Vol. 68; no. 3; pp. 406 - 417
• Main Authors: Tsydenov, K. A., Belov, N. A., Doroshenko, V. V., Shcherbakova, O. O., Muravyeva, T. I.
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.07.2024; Springer Nature B.V
• Subjects: Characterization and Evaluation of Materials; Chemistry and Materials Science; Cold rolling; Copper; Deformation effects; Dispersions; Heat resistant alloys; Heat treatment; Hot rolling; Low temperature resistance; Magnesium; Materials Science; Mechanical properties; Metallic Materials; Solid solutions; Zinc; dispersoids; Mn; Cu; Al–Cu–Mn system; Phase composition; Rolling; Mechanical properties; Al; Microstructure; Heat-resistant aluminum alloys; 669.717, 669.7.017
• ISSN: 0026-0894; 1573-8892
• DOI: 10.1007/s11015-024-01742-1

In this study, using an example of cold-rolled sheets, the separate effect of magnesium and zinc in an amount up to 2% upon the structure and mechanical properties of a thermally non-hardening heat-resistant alloy Al–2%Cu–1.5%Mn, the composition of which is optimized to obtain the maximum fraction of Al 20 Cu 2 Mn 3 phase, is studied. It is found that in a cast state, zinc is completely contained within aluminum solid solution, and magnesium is partially included within eutectic particles of the Al 2 CuMg phase. These elements hardly affect the amount of Al 20 Cu 2 Mn 3 phase, which is formed during deformation and heat treatment in the form of nanoscale dispersoids. It is found that addition of 1% magnesium increases the strength of cold-rolled sheets of the base alloy by 15% after 3‑hour annealing at 400 °C, without reducing the ductility. In turn, alloying with zinc does not have a significant effect on strength.