Deformation heterogeneity and intragrain lattice misorientation in high strength contrast, dual-phase bridgmanite/periclase
| Autor: | Matthew Kasemer, Hans-Rudolf Wenk, Eloisa Zepeda-Alarcon, Paul R. Dawson, Robert Carson |
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| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Materials science Polymers and Plastics Condensed matter physics Misorientation Silicate perovskite Metals and Alloys 02 engineering and technology Relative strength Plasticity engineering.material 021001 nanoscience & nanotechnology 01 natural sciences Physics::Geophysics Electronic Optical and Magnetic Materials Condensed Matter::Superconductivity 0103 physical sciences Ceramics and Composites engineering Orthorhombic crystal system Crystallite Periclase 0210 nano-technology Anisotropy |
| Zdroj: | Acta Materialia. 189:284-298 |
| ISSN: | 1359-6454 |
| Popis: | A bridgmanite/periclase aggregate is investigated due to its prevalence in the Earth’s lower mantle and its importance for understanding geodynamic processes. In dual-phase polycrystalline aggregates, both strength contrast between phases and single crystal elastic and plastic anisotropy are known to influence the development of intragrain misorientation, and the evolution of crystallographic texture. In this study, full-field crystal plasticity simulations are performed with a finite element solution method, and applied to an aggregate of a mechanically strong orthorhombic phase with perovskite structure (bridgmanite, MgSiO3), and a relatively weaker cubic phase (periclase, MgO). The relative strengths of the phases are parameterized to elucidate the effect that strength contrast has on texture evolution and single-phase simulations are performed for comparison. Overall, results indicate that the relative strength between the two phases influences the development of plasticity, and the overall texture evolution. Results are discussed in light of trends related to the evolution of plasticity and misorientation in the aggregate, and their dependence on both the strength contrast between phases as well as the spatial distribution of grains and phases. |
| Databáze: | OpenAIRE |
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