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@ARTICLE{Tandogan:1046171,
      author       = {Tandogan, I. T. and Budnitzki, M. and Sandfeld, S.},
      title        = {{A} multi-physics model for dislocation driven spontaneous
                      grain nucleation and microstructure evolution in
                      polycrystals},
      journal      = {Journal of the mechanics and physics of solids},
      volume       = {206},
      number       = {Part A},
      issn         = {0022-5096},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2025-03714},
      pages        = {106325 -},
      year         = {2026},
      abstract     = {The granular microstructure of metals evolves significantly
                      during thermomechanical processing through viscoplastic
                      deformation and recrystallization. Microstructural features
                      such as grain boundaries, subgrains, localized deformation
                      bands, and non-uniform dislocation distributions critically
                      influence grain nucleation and growth during
                      recrystallization. Traditionally, modeling this coupled
                      evolution involves separate, specialized frameworks for
                      mechanical deformation and microstructural kinetics,
                      typically used in a staggered manner. Nucleation is often
                      introduced ad hoc, with nuclei seeded at predefined sites
                      based on criteria like critical dislocation density, stress,
                      or strain. This is a consequence of the inherent limitations
                      of the staggered approach, where newly formed grain
                      boundaries or grains have to be incorporated with additional
                      processing.In this work, we propose a unified,
                      thermodynamically consistent field theory that enables
                      spontaneous nucleation driven by stored dislocations at
                      grain boundaries. The model integrates Cosserat crystal
                      plasticity with the Henry–Mellenthin–Plapp orientation
                      phase field approach, allowing the simulation of key
                      microstructural defects, as well as curvature- and stored
                      energy-driven grain boundary migration. The unified approach
                      enables seamless identification of grain boundaries that
                      emerge from deformation and nucleation. Nucleation is
                      activated through a coupling function that links
                      dislocation-related free energy contributions to the phase
                      field. Dislocation recovery occurs both at newly formed
                      nuclei and behind migrating grain boundaries.The model’s
                      capabilities are demonstrated using periodic bicrystal and
                      polycrystal simulations, where mechanisms such as
                      strain-induced boundary migration, subgrain growth, and
                      coalescence are captured. The proposed spontaneous
                      nucleation mechanism offers a novel addition to the
                      capabilities of phase field models for recrystallization
                      simulation.},
      cin          = {IAS-9},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IAS-9-20201008},
      pnm          = {5111 - Domain-Specific Simulation $\&$ Data Life Cycle Labs
                      (SDLs) and Research Groups (POF4-511)},
      pid          = {G:(DE-HGF)POF4-5111},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.1016/j.jmps.2025.106325},
      url          = {https://juser.fz-juelich.de/record/1046171},
}