M5 Application models to κ-carbides
| Prof. Dr. Robert Svendsen | Dr. Pratheek Shanthraj |
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| bob.svendsen@rwth-aachen.de | p.shanthraj@mpie.de |
| Jaber Rezaei Mianroodi |
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| jaber.rezaeimianroodi@cmm.rwth-aachen.de |
The proposed work is concerned with the formulation, comparison and application of phase-field-based chemomechanical models for metallic alloys undergoing phase transitions, dislocation-mediated finite deformation, and failure. On the methodological side, this is based for example on generalization and further development of existing approaches such as WBM (Wheeler-Boettinger-McFadden) and KKS (Kim-Kim-Suzuki) for chemical homogenization to large-deformation chemomechanics (Svendsen et al., J. Mech. Phys. Solids 112, 2018). These will be compared with existing chemomechanical models for small deformation in the context for example of benchmark simulations and the modelling of excess interface energy (Masters Thesis Kishan Govind). In addition, models based on both artificial and physical (i.e., sublattice- and element-site-fraction-based) chemical order parameters will be extended to finite-deformation chemomechanics, facilitating coupling to CALPHAD (Liu et al., arXiv:2104.05791v1, 2021). Likewise, the modelling of dislocation processes and failure will be included via the generalization of phase-field microelasticity for defects and phase-field fracture to finite deformation (Svendsen et al., Journal of the Mechanics and Physics of Solids 112, 2018). Principle applications of the proposed method and model developments include the modelling of precipitation, dislocation-solute interaction, and dislocation-precipitate interaction (in Ni-Al-Co alloys: Mianroodi et al., Acta Mat. 175, 2019; in Ni-Al-Re alloys: Wu et al., Nat. Comm. 11, 2020; for a model binary alloy: Mianroodi et al., Materials 14, 2021). Of particular interest in this regard are Fe-Mn-C-Al-based low-density steel κ-carbides (Mianroodi et al., in preparation, 2021).