About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Environmentally Assisted Cracking: Theory and Practice
|
Presentation Title |
Understanding Sensitization Rate Effects on Stress Corrosion Cracking for 5xxx Marine Grade Aluminum Alloys |
Author(s) |
William Golumbfskie, Emily Holcombe, Eric Dau, Matthew McMahon |
On-Site Speaker (Planned) |
William Golumbfskie |
Abstract Scope |
5xxx aluminum alloys are used in marine applications due to their corrosion resistance coupled with high as-welded strength. A current concern is that 5xxx alloys can become sensitized in service, ultimately leading to stress corrosion cracking (SCC). Sensitization occurs when magnesium precipitates out of solution forming a deleterious beta-phase (Mg2Al3) continuously around grain boundaries. The extent and rate of sensitization is dictated by exposure to elevated temperatures.
This study will evaluate the SCC performance of 5083 and 5456 alloys with respect to degree of sensitization and sensitization rate. Slow rising stress intensity testing is used to quantify the effects of sensitization on IG-SCC susceptibility, identifying differences in threshold stress intensity in potentiostatic conditions and full seawater immersion. Microscopy coupled with Electron backscatter diffraction (EBSD) will be used to characterize the material microstructure, to link the extent and location of beta-phase formation to resultant SCC performance. |
Proceedings Inclusion? |
Planned: |
Keywords |
Aluminum, Environmental Effects, Other |