AA7050-T7451 aluminum alloy is one of the most used material in aeronautical applications due to its high strength/density ratio and good fatigue resistance. More recently the AA2050-T84 alloy was introduced due to its reduced density and comparable static mechanical properties. However, fatigue crack propagation properties in corrosive environments are yet to be documented. In this paper fatigue crack propagation was evaluated in saline (3.5 wt% NaCl solution) and air environments. The AA2050-T84 alloy presented a better fatigue performance both in air and aqueous saline environments. Its superior performance was ascribed to non-homogeneous deformation and higher corrosion resistance. These results show the AA2050-T84 alloy as a potential candidate to replace AA7050-T7451 alloy in aeronautical components subjected to fatigue in corrosive environments.

AA7050-T7451铝合金由于其高强度/密度比和良好的抗疲劳性，是航空应用中最常用的材料之一。最近引入了 AA2050-T84 合金，因为它具有较低的密度和相当的静态机械性能。然而，腐蚀环境中的疲劳裂纹扩展特性还有待记录。在本文中，疲劳裂纹扩展在盐水（3.5 wt% NaCl 溶液）和空气环境中进行了评估。AA2050-T84 合金在空气和盐水环境中均表现出更好的疲劳性能。其优越的性能归功于非均匀变形和更高的耐腐蚀性。