Complas 2025

COMPLAS 2025

A Multiphase field Approach to Crystal Plasticity for Investigating Mechanical Anisotropy in Additive Manufactured High Entropy Alloys

Schöller, Lukas (Karlsruhe University of Applied Sciences)
Prahs, Andreas (Karlsruhe Institute of Technology (KIT))
Schneider, Daniel (Karlsruhe Institute of Technology (KIT))
Li, Xiaopeng (University of New South Wales)
Nestler, Britta (Karlsruhe Institute of Technology (KIT))

In session: 1704 - Phase-Field Approaches to Plasticity and Inelasticity

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Unlike Mises plasticity, (classical) crystal plasticity (CP) explicitly accounts for the underlying crystalline microstructure, including the crystal lattice and corresponding slip systems. In polycrystalline materials, grain boundaries (GBs) significantly influence the overall mechanical behavior, as they act as material singular surfaces in classical continuum mechanics. However, tracking these GBs during microstructure evolution simulations presents numerical challenges and computational costs. This issue can be effectively addressed by incorporating crystal plasticity (CP) into the multiphase-field method (MPFM), which models moving surfaces as diffuse interfaces with finite thickness [1,2]. The mechanical anisotropy of high-entropy alloys (HEAs) arises from their unique microstructure, particularly when processed via additive manufacturing [3]. The integration of CP with MPFM allows a detailed analysis of this anisotropy, as it allows the microstructure to be taken into account. Using experimental electron backscatter diffraction (EBSD) data and a characteristic volume element, an inverse parameter identification is performed to determine the material properties for the CP model. These properties enable the CP model to accurately reproduce the anisotropic mechanical response of the HEA. Additionally, the effect of morphological features on mechanical behavior is investigated, offering deeper insight into the relationship between processing parameters and the effective mechanical properties of HEAs.