Combined crystal plasticity simulations and experiments for parameter identification: application to near-β titanium alloy

Abstract

In this work, the crystal plasticity finite element (CPFE) simulations and experiments of nanoindentation and tensile tests are conducted to obtain the load–displacement curves of primary α grains and the true stress–true strain curves of equiaxed β aggregate, respectively. The satisfying agreement of the experimental and simulated curves demonstrates that proposed strategy could successfully identify the crystal plasticity constitutive parameters for Ti-7333 alloy, as well as for other near-β titanium alloy. Based on simulated results, the activation of slip systems and the ratio of critical resolved shear stress of basal slip to prismatic slip in primary α grains are discussed. The evolution of geometrically necessary dislocation density during tensile deformation is investigated. These results not only provide accurate parameters for mechanical behavior prediction of Ti-7333 alloy by CPFE simulations, but also contribute to further understandings in deformation mechanism of titanium.