Microscopic Strain Localization of Ti-6Al-4V Alloy Under Uniaxial Tensile Loading

In this paper, Plate specimens for tensile tests with two different microstructures (as-received and heat treated) were studied. Micromechanical modelling by using a representative volume element has been adopted to investigate the tensile flow behavior of Ti-6Al-4V alloy. Voronoi tessellation model and actual microstructure model were developed to predict the macroscopic stress versus strain behavior. Kinematic hardening rule was used to simulate the nonlinear hardening. Results showed that Both VT model and actual microstructure model had good ability to predict the stress-strain response. The stress and strain distribution showed that VT model agreed with the microstructure-based model well. Simulation result was consistent with experimental result that measured by digital image correlation test. In addition, the microstructure-level inhomogeneity and incompatible deformation between the hard and soft phases were the main reason for damage.