About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
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Symposium
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Neutron and X-ray Scattering in Materials Science
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Presentation Title |
On the Estimation of Elastic Constants in Low Symmetry Materials with In-situ Neutron Diffraction Measurements |
Author(s) |
Nathan E. Peterson, Daniel Savage, Sean Agnew, Donald Brown, Bjørn Clausen, Aaron Stebner, Elena Garlea |
On-Site Speaker (Planned) |
Nathan E. Peterson |
Abstract Scope |
Knowledge of the single crystal elastic constants for a given material is essential for many modeling efforts in materials science. Traditionally, these constants were measured with acoustic methods on single crystals, which are difficult to obtain for certain materials. Alternatively, an assessment can be made using in-situ diffraction measurements on polycrystals, which provides a stress-strain response at both the aggregate and grain set level. These two measures are then connected with a micromechanical model, such as the Voigt, Reuss, or Kröner (self-consistent) models. In this work, a combined elastic self-consistent model and whole pattern fitting approach was used to analyze in-situ neutron diffraction data to estimate the elastic constants of two low symmetry materials: α-U (orthorhombic) and B19’ NiTi (monoclinic). The robustness of the approach was evaluated through a variance-based sensitivity analysis, while the uncertainty of the elastic constant estimates was assessed using a Markov Chain Monte Carlo (MCMC) approach. |
Proceedings Inclusion? |
Planned: |
Keywords |
Characterization, Mechanical Properties, Computational Materials Science & Engineering |