low Cycle Fatigue behavior of aluminum alloy AA6063 heat treated at 350 ° c with different holding times was studied . Constant S – N Curve is designed with the main fatigue parameters . The results are verified with that obtained numerically . Using different holding times with low cycle fatigue properties AA6063 have been observed . Holding times of 2 , 4 , 6 and 8 hours at 350 ° C temperature was used . The yield stress and the ultimate tensile strength were decreased with the increasing the holding time . The strength Coefficient K and the strain hardening index n results were increased as the holding time temperature increased . Also the exponent b of fatigue strength and the exponent C of fatigue ductility were increased as the holding time increased . Cyclic elastic Strain do not change much with increasing the time at Same temperature 350 ° C and the situation is also the Same for fatigue strain coefficient , for the cyclic plastic strain - Optic Micrograph images were taken using variable magnification before and after fatigue test . Moreover the failure mechanisms with microstructural features are studied using scanning electron microcopy (SEM)
The mechanical and constant fatigue behavior of AA6063-T6 exposed to aggressive 3.5 wt.% NaCl solution corrosion has been investigated. The selected alloy used in this work is typically employed in structured components like aircraft spars. Some tensile and fatigue specimens were hardened using shot peening (SP) treatment for 10 mins, shot peening time. The experimental results revealed that the (UTS) and (YS) were reduced by 10.88% and 9% respectively due to corrosion while ductility increased from 12.5% to 14%. SP treatment improved the above reduction percentage to 8.17% for (UTS) and 7.53% for (YS). Corrosion-fatigue had a significant impact on fatigue life as well as strength at lower stress levels, but had no influence at higher stress levels. The endurance fatigue limit (EFL) reduced to 62.64 MPa and raised to 64 MPa due to corrosion when using (SP) treatment
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