Micropolar crystal plasticity and orientation phase field for evolution of grain microstructure I.T. Tandogan1,∗, M. Budnitzki1, S. Sandfeld1,2 1 Institute for Advanced Simulations – Materials Data Science and Informatics (IAS-9), Forschungszentrum Jülich Gmbh, 52425 Jülich, Germany 2 Chair of Materials Data Science and Materials Informatics, Faculty 5 – Georesources and Materials Engineering, RWTH Aachen University, 52056 Aachen, Germany ∗ t.tandogan@fz-juelich.de Keywords: Cosserat Crystal Plasticity, Grain boundary migration, Orientation Phase Field The challenge of predicting changes in the microstructure of metals undermechanical loading at temperatures above 300◦C remains complex due to the involvement ofmultiple mechanisms. The change in crystal orientation at a point within the material canoccur as a result of both plastic deformation and migration of grain boundaries. To addressthis issue, researchers have previously combined the Kobayashi-Warren-Carter (KWC)orientation phase field with crystal plasticity [1]. It was later recognized that the micropolartheory provides a more suitable framework for this problem, leading to the coupling of theKWC orientation phase field with Cosserat crystal plasticity [2]. However, the KWCformulation includes a singular diffusion equation and is limited to grain boundary energiesof the Read-Shockley type. In recent developments, an alternative model for the orientationphase field has been proposed, which allows for anisotropic grain boundary energies [3]. Inthis study, we extend this model by coupling it with Cosserat crystal plasticity and compareits predictive capabilities and numerical performance to the KWC-Cosserat crystal plasticitycoupling within a two-dimensional finite element framework. References [1] Admal, N.C. and Po, G. and Marian, J. A unified framework for polycrystal plasticity withgrain boundary evolution. International Journal of Plasticity, Vol. 106, pp. 1-30, 2018. [2] Ask, A. and Forest, S. and Appolaire, B. and Ammar, K. and Salman, O.U. A cosserat crystalplasticity and phase field theory for grain boundary migration. Journal of the Mechanics andPhysics of Solids, Vol. 115, pp. 167-194, 2018. [3] Staublin, P. and Mukherjee, A. and Warren, J.A. and Voorhees, P.W. Phase-field model foranisotropic grain growth. Acta Materialia, Vol. 237, 2022. 104
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