Numerical simulations of adiabatic shear localization in textured FCC metal based on crystal plasticity finite element method

Experimental investigations of adiabatic shear localization in the nanostructured face-centered-cubic (FCC) alloys have revealed that micro-texture has a key role in advancing the formation of adiabatic shear bands (ASBs) (see reference [35]). In this work, we present the crystal plasticity finite element simulations (CPFEM) of dynamic uniaxial compression and simple shear in polycrystalline models with different initial textures. The aim is to study the effects of typical textures, which are often observed in FCC metals after severe plastic deformation or recrystallization, on the formation of ASBs under high strain rate loading. The materials response is described by an elastic-viscoplastic continuum slip constitutive relation, in which the dependence of slip systems’ resistance on the temperature evolution is also considered. Simulation results show that, under high-rate compression, except for some textures which are not favorable for the formation of ASBs, different textures lead to various orientation of shear bands and different critical strains at which the shear localizations occur. High-rate simple shear loading is found to facilitate ASB formation. Even in the texture-free, namely Random texture, model obvious shear localization was observed. However, the dependence of slip system activation on texture leads to considerable variation in the critical shear strain level for ASB initiation. Additionally, the effects of some factors, such as strain rate, temperature rise and strength of materials, on the formation of ASBs in FCC textured metals are discussed to interpret the formation process in more depth. We also combined the experimental observations and numerical simulations to elaborate the reason why ASBs have rarely been reported in FCC materials.