Comparison of anisotropy evolution in BCC and FCC metals using crystal plasticity and texture analysis

The evolution of anisotropy in metals has been studied for many decades both experimentally and theoretically using computation. Although the experimental research on the evolution of anisotropy provided valuable data, there is lack of theories that can be used in macro-scale plasticity. Fracture of ductile metals occurs after going through a large amount of plastic deformation where anisotropy of the material changes significantly as manifested by texture development; processed metal slabs (such as rolled slabs) possess anisotropy due to texture produced by the metal forming process that the slabs went through and initially isotropic metals get to possess anisotropy as well due to the texture formation induced by the large amount of plastic deformation. Therefore, it is critical to take into account the effect of anisotropy evolution to accurately predict fracture characteristics and plastic flow behaviors in the simulation of ductile fracture and plastic flow of metals. The theory of anisotropy evolution of metals in macro-scale plasticity can be derived by quantifying the meso-scale grain-level physics through crystal plasticity simulations. Therefore, this paper investigates the evolution of anisotropy in BCC and FCC metals using crystal plasticity simulations and texture analysis to reveal the physics behind anisotropy evolution and provide comparison of anisotropy evolution between BCC and FCC metals, which can be used to propose the theory of anisotropy evolution in macro-scale plasticity.