Corrosion Fatigue Crack Propagation in Aluminum Alloys. Part I. Effect of Cyclic Stress Wave Form on Corrosion Fatigue Crack Propagation in Al-Zn-Mg Alloys. Part II. Mechanisms of Corrosion Fatigue Crack Propagation in Al-Zn-Mg Alloys

摘要

The report is divided into 2 parts. In part one, fatigue crack growth rates of a 7075 type aluminum alloy were measured as a function of environment, frequency, stress wave form, alloy chemistry, and thermomechanical treatment. Results are discussed. Part 2 discusses corrosion fatigue crack propagation tests which were performed on commercial 7075 alloys. Testing was done in a 3.5% sodium chloride solution under constant impressed potential and under reversed anodic-cathodic current conditions.