About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
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Symposium
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Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
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Presentation Title |
In-situ Characterization and Modelling of Cyclic Deformation in Rare-earth Magnesium Alloys |
Author(s) |
Duncan A. Greeley, Mohammadreza Yaghoobi, Darren Pagan, Veera Sundararaghavan, John Allison |
On-Site Speaker (Planned) |
Duncan A. Greeley |
Abstract Scope |
Rare-earth magnesium alloys are attractive materials for lightweighting due to their low density and high strength-to-weight ratio. In structural transportation applications, fatigue damage is a primary concern and understanding underlying deformation mechanisms is essential for accurate prediction of component life. In this study, cyclic deformation in Mg-2.4wt.%Nd was tracked in-situ utilizing High Energy X-Ray Diffraction Microscopy (HEDM) at the Cornell High Energy Synchrotron Source (CHESS). Full-volume unloaded grain morphology and local orientation were measured with near-field HEDM. Evolution of grain-by-grain slip system activity and twinning in a single displacement-controlled, fully-reversed loading cycle was characterized with far-field HEDM for the Mg-Nd alloy in as-extruded and solution heat treated conditions. Cyclic strain evolution was modelled using PRISMS-Plasticity, an open-source, parallel 3-D crystal plasticity finite element software package, and the dataset is publicly published in the Center for Predictive Integrated Materials Science (PRISMS) Materials Commons data repository. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |