|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Environmentally Assisted Cracking: Theory and Practice
||Environmentally Assisted Stress Corrosion Cracking of 5xxx Al Alloys in Atmospheric Environments
||Patrick Steiner, James Burns
|On-Site Speaker (Planned)
Intergranular stress corrosion cracking (IG-SCC) testing has typically been performed with specimens fully immersed in electrolytic solution due to experimental convenience. However, true atmospheric environments are often typified by salt-spray, rain, or a deliquesced thin-film electrolyte. These environments differ in the pertinent mass-transport distances and/or local ionic resistance influencing the cathodic/anodic reaction kinetics that control the crack tip hydrogen production. In this study the effect of atmospheric environments on the IG-SCC behavior of AA5083-H131 and AA5456-H116 tensile samples is studied using slow-rising displacement testing and high-fidelity monitoring of crack growth kinetics. These results are analyzed in the context of a coupled anodic dissolution and hydrogen-embrittlement mechanism, in which the observed reduction in the IG-SCC susceptibility of the atmospheric environments is cathodically limited. This would indicate a decrease in the dissolution at the crack tip, a less aggressive crack chemistry development, and subsequently lower levels of hydrogen production in atmospheric environments.
||Planned: Supplemental Proceedings volume