Effect of aging on structure and strength of high pressure torsion processed 2024 aluminum alloy

Open School-Conference of NIS Countries Ultrafine Grained and Nanostructured Materials

Markushev, M.V.^1 ; Avtokratova, E.V.^1 ; Ilyasov, R.R.^1 ; Krymskiy, S.V.^1 ; Khazgalieva, A.A.^1 ; Sitdikov, O Sh^1

Institute for Metals Superplasticity Problems, Russian Academy of Sciences, 39 Khalturin st., Ufa

450001, Russia^1

关键词: 2024 aluminum alloy;    Artificial aging;    High pressure torsions;    Post-deformation annealing;    Property relations;    Recovery and recrystallization;    T6 heat treatment;    Temperature range;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/447/1/012008/pdf
DOI  :  10.1088/1757-899X/447/1/012008

来源: IOP

【 摘 要 】

Pre-quenched samples with a diameter of 20 mm and a thickness of 1 mm, cut from commercial hot-pressed rod of the 2024 aluminum alloy, were severely deformed by high-pressure torsion (HPT) with 10 revolutions under a pressure of 6 GPa at room temperature and then annealed for up to 50 hours in the temperature range of 100-190 °C. It was found that the post-deformation annealing at relatively low temperatures and/or short times can result in the alloy aging and 10-15% increased hardness. However, the conventional regimes of artificial aging of the alloy according to T6 heat treatment led to a sharp drop in its strength due to recovery and recrystallization of the matrix and simultaneous overaging. The nature of the revealed structural and property relations is discussed.