About this Abstract |
| Meeting |
2027 TMS Annual Meeting & Exhibition
|
| Symposium
|
Magnesium Technology 2027
|
| Presentation Title |
A Microstructural Approach to the Computational Modelling of Biodegradation in Magnesium Alloys: Effects of Grain Size and Orientation |
| Author(s) |
Fatemeh Karamifard, Ted Vaughan, Peter McHugh |
| On-Site Speaker (Planned) |
Peter McHugh |
| Abstract Scope |
A highly efficient phenomenological and statistically-based pitting corrosion model, implemented using FEA, that we previously developed for Mg alloys in medical implant applications [Grogan et al. Acta Biomater 2011;7:3523-3533, Quinn et al. J Mech Behav Biomed Mater 2023;138:105637] is applied to Mg WE43 alloy biodegradation. A polycrystalline microstructure is considered, with individual grains represented using a distribution of HCP crystal lattice orientations, and using DCT-based and idealised regular hexagonal grain geometries. The model incorporates preferential corrosion on (0001) basal planes (from experimental observations [Wang et al. Corros Sci 2025;255:113151]) and grain boundary effects. Simulation results to date indicate that microstructural corrosion is non-uniform and grain geometry dependent, with finer grain microstructures generating more uniform corrosion, while macroscale corrosion rates depend less on grain geometry and more on average grain size and average crystal lattice orientations. Overall, the modelling approach provides useful insights to aid microstructural design of bioresorbable implant materials. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Magnesium, Modeling and Simulation, Biomaterials |