Altuntaş, G., Altuntaş, O. and Bostan, B. 2023. EFFECT OF CRYOGENIC AND NATURAL AGING PROCESS APPLIED TO Al-Zn-Mg-Cu ALLOYS ON LIFE TIME CALCULATION: Received: 19th June 2023; Revised: 29th June 2023, 12th October 2023, 25th October 2023; Accepted: 31st October 2023. MATTER: International Journal of Science and Technology. 9, (Nov. 2023), 113–126. DOI:https://doi.org/10.20319/mijst.2023.9.113126.