Characterization, Understanding, and Mitigation of Stress Corrosion Cracking in Al-Mg AlloysThursday (07.11.2019) 11:05 - 11:25 Part of:
AA5xxx-series alloys offer an attractive combination of strength-to-weight ratio and corrosion resistance, which has motivated increasing use in marine applications. These alloys are solid solution strengthened with a supersaturation of Mg, which can lead to precipitation of the deleterious β-phase on the grain boundaries (e.g. sensitization) at service relevant temperatures. This β-phase is anodic to the matrix and enables intergranular stress corrosion cracking (IG-SCC). This talk will highlight recent efforts in four areas scaling from mechanistic understanding to informing engineering solutions. Specifically, characterizing and mechanistic interpretation of IG-SCC in atmospheric environments, critique and improvement of the standardized method (ASTM G67) for establishing the level of sensitization, mitigation via polarization with metal rich coatings, and fracture mechanics based methods for structural management.