|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||NOW ON-DEMAND ONLY - E-22: Phase-field Modeling of the Effects of Second Phases on the Corrosion of Mg Alloys
||Yanjun Lyu, Vishwas Goel, David Montiel, Stephen Dewitt, Alexander Chadwick, Katsuyo Thornton
|On-Site Speaker (Planned)
Magnesium alloys are known for having the highest strength-to-weight ratio among all structural alloys. However, one factor that limits their application is poor corrosion resistance, which is strongly dependent on alloy composition. For example, second phases in Mg alloys are often nobler than Mg matrix and act as cathodes, thereby promoting a microgalvanic effect which accelerates corrosion. Thus, understanding the effect of second phases on Mg alloy corrosion is crucial to designing corrosion-resistant alloys. In this work, we combine the phase-field model and smoothed boundary methods to investigate the microgalvanic effects of second phases on the corrosion behavior of Mg alloys. Starting from a microstructure representative of the alloy surface, we simulate the corrosion of the alloy when exposed to a well-stirred electrolyte. In particular, we investigate how the compositions of the alloy and second phases affect the overall corrosion rate and corrosion front morphology.
||Magnesium, Modeling and Simulation,