Prior Aggressive Corrosion and Fatigue of AA6063-T6 under Shot Peening Application

Abstract

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