Effect of deep cryogenic treatment on the microstructure and mechanical properties of Al-Cu-Mg-Ag alloy

Effect of deep cryogenic treatment (DCT) on the aging behavior and tensile properties of Al-Cu-Mg-Ag alloy was investigated. Results show that DCT of Al-Cu-Mg-Ag alloy produces plastic deformation of about 0.2% and high-density dislocations in the a-Al matrix. These dislocations cut second-phase particles in under-aged Al-Cu-Mg-Ag alloy, resulting in a decrease in the size of c1 precipitates and an increase in the number density, thereby weakening the adverse effects of DCT on the tensile properties of the alloy.& COPY; 2023 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).