About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
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Symposium
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Advanced Characterization Techniques for Quantifying and Modeling Deformation
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Presentation Title |
Characterization and Modelling of Twin Evolution and Cyclic Deformation in Magnesium Alloys by High Energy X-ray Diffraction Microscopy |
Author(s) |
Duncan A. Greeley, Mohammadreza Yaghoobi, Darren C. Pagan, Veera Sundararaghavan, John E. Allison |
On-Site Speaker (Planned) |
Duncan A. Greeley |
Abstract Scope |
Twinning and detwinning play an important role in deformation evolution during low-cycle fatigue of magnesium alloys. Understanding both the influence of microstructure and texture on twin evolution as well as the mechanistic impact of the twin-detwin process on local micromechanical states are necessary for accurately predicting fatigue behavior. Cyclic deformation of Mg-2.4wt.%Nd was analyzed in this study through in-situ far-field and near-field High Energy X-Ray Diffraction Microscopy (HEDM) at the Cornell High Energy Synchrotron Source (CHESS). Grain-scale twin nucleation, growth, and detwinning were tracked using far-field HEDM and were correlated to the evolution of grain elastic strain and orientation during single fully-reversed, displacement controlled loading cycles. The impact of twin activity on parent grain and grain-neighborhood deformation was investigated, and deformation in the 3D near-field HEDM microstructure was simulated with the PRISMS-Plasticity crystal plasticity finite element software. The dataset from this study is published in the Materials Commons data repository. |
Proceedings Inclusion? |
Planned: |
Keywords |
Magnesium, Mechanical Properties, |