| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Environmentally Assisted Cracking: Theory and Practice
|
| Presentation Title |
Phase Field Modeling of Galvanic Corrosion in Magnesium-aluminum Joints |
| Author(s) |
Kübra Karayağiz, Adam C. Powell, Qingli Ding, Brajendra Mishra |
| On-Site Speaker (Planned) |
Kübra Karayağiz |
| Abstract Scope |
Several future light-weight automotive designs require joining aluminum and magnesium alloy parts in order to take maximum advantage of the best properties of both materials. However, such joints inherently give rise to galvanic corrosion between the two metals, their intermetallic compounds, and other phases in the alloys themselves. Presented here is a formulation with two-dimensional results for multiscale modeling of this corrosion, consisting of macroscopic computation of galvanic potential distribution over the joint, coupled with grain-level phase field modeling of micro-galvanic material degradation at each phase. Modeling is guided by experimental observations of aqueous corrosion of diffusion-bonded magnesium-aluminum couples in order to provide a relatively simple geometry and microstructure for initial development. The formulation is intended for later use with more complex geometries and joints including friction stir welds between magnesium and aluminum alloy sheet. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |