Multistage Fatigue (MSF) Modeling of Magnesium in a Corrosion Environment

Excerpt

This work presents an overview of using the multistage fatigue model with a corrosion model to capture the behavior of magnesium alloys. One can argue that magnesium alloys used for structural components are always in a corrosive environment as no real practical structural component operates in a vacuum. As such, different magnesium alloys are analyzed in the context of their fatigue incubation, microstructurally small crack (MSC), and long crack regimes under a vacuum, air, and saltwater environments. The different magnesium alloys analyzed, including AE44, AM30, AM50, AM60, AZ31, AZ61, AZ91 alloys. These alloys were fabricated under different methods and each had different heat treatments. The levels of corrosion pitting, general corrosion, and filiform corrosion were quite different for each alloy, meaning that the interdependence of the different corrosion mechanisms interacted differently with each alloy’s incubation, MSC, and LC fatigue lives. …