The impact of various heat treatment techniques applied to AA7075 alloys on the fatigue behaviour was investigated in this work. Anodizing (O), high temperature pre-precipitating (HTPP), artificial ageing (T6), retrogression, and re-aging were the procedures used on AA7075 aluminium (RRA). The samples underwent a 2-hour annealing heat treatment at 500°C before being cooled in the furnace. Following the HTTP, RRA, and T6 heat treatment operations, the samples were solution treated for two hours at e before being subjected to the artificial ageing (T6) method. The results of the fatigue testing showed that the annealed (O) samples had the lowest fatigue strength and the samples that had undergone artificial age (T6) had the maximum fatigue strength. They were heated to 500°C, cooled to ambient temperature, and then matured for 24 hours at 120°C. In the retrogression and re-aging procedure, samples were re-aged for 24 hours at 120°C after being solution treated for an hour at 220°C after the T6 method. Precipitates were created in the high temperature pre-precipitating for 30 minutes at 450°C, and then they were matured for 24 hours at 120°C. Through the use of the scanning electron microscope (SEM + EDS), hardness tests, and X-ray difraction (XRD) techniques, all samples were analysed. At the end of experimental studies, SEM and EDS examinations XRD results revealed that η (MgZn2) phase heat treatment procedures for T6. The results of the fatigue testing showed that the annealed (O) samples had the lowest fatigue strength and the samples that had undergone artificial age (T6) had the maximum fatigue strength.

fatigue behaviour, various heat treatments, and AA7075 alloy