Deformation twinning, a common deformation mechanism in metals with a hexagonal close-packed (HCP) structure, produces plastic strain accompanied with the creation of twinned domains within the matrix. Phase-field models for deformation twinning often suffer from unphysically diffuse or overly wide interfaces, particularly under large and inhomogeneous driving forces. Maintaining a dynamically stable interface is essential for achieving an accurate description of interface motion. In this work, we propose a Forward-Backward Regularization (FBR) method to control the width of twin interfaces. This is accomplished by introducing an energy penalty term—linked to the gradient magnitude of the order parameter—into the total free energy functional. This method decouples the numerical control of interface width from the physical material parameters (e.g., interfacial energy), thereby preserving their intrinsic physical significance. The FBR method demonstrates robust performance in multiple scenarios, including interfacial energy-driven interface contraction, bulk driving force-induced interface expansion, and mesh size insensitivity to twin propagation. Integrated the FBR model into a coupled Crystal Plasticity Finite Element - Phase Field (CPFE-PF) model, the FBR approach is examined to effectively control interface width, reduce mesh orientation sensitivity, and reproduce twin propagation and transmission across grain boundaries. This robust, computationally efficient FBR model holds promise for broader applications in PF modeling of shear transformation bands with precise interface control.
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