About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Environmentally Assisted Cracking: Theory and Practice
|
Presentation Title |
Utilizing Predictions from Precipitation Modeling to Produce 5XXX Series Aluminum Alloy Plate with Lowered Sensitization Responses |
Author(s) |
Matthew A. Steiner, Likun Sun |
On-Site Speaker (Planned) |
Matthew A. Steiner |
Abstract Scope |
As super-saturated solid solutions of Al-Mg, 5XXX series aluminum alloys are susceptible to sensitization via intergranular precipitation of the anodic β-phase, which promotes intergranular corrosion, exfoliation and stress corrosion cracking in marine environments. Building upon an improved understanding of how grain boundary β-phase precipitates impact the sensitization response, which closely follows a Johnson-Mehl-Avarami-Kolmogorov (JMAK) model adapted to handle the impinging locally sensitized regions surrounding discrete β-phase precipitates, a clear change in the β-phase nucleation and growth kinetics in these alloys can be observed above 100°C. Taking advantage of predictions based upon this model, we will demonstrate that it is possible to reduce the sensitization kinetics in these alloys to nearly half their original rate in the as-received plate condition through a novel and minimally invasive pre-treatment strategy, doubling the possible service lifetime of these alloys. |
Proceedings Inclusion? |
Planned: |
Keywords |
Aluminum, Environmental Effects, Phase Transformations |