Influence of critical resolved shear stress ratios on the response of a commercially pure titanium oligocrystal: crystal plasticity simulations and experiment

Abstract

Direct comparisons between crystal plasticity simulations and experiments dedicated to test a sample containing a small number of grains (oligocrystal), instrumented using full field measurement techniques (DIC, grid method), have demonstrated their efficiency to reproduce the behavior of BCC and FCC metals at the grain scale. The extension of this approach to HCP metals, specifically for a grade 2 commercially pure titanium (CP-Ti) sample, is the objective of the present work. The influence of the critical resolved shear stress ratios on the numerical predictions of strain field and slip activity during uniaxial tension of the titanium oligocrystal was investigated. Simulation results were compared with their experimental counterparts, showing that a small variation of the critical resolved shear stress ratios identified by the authors in a previous study dedicated to grade 1 CP-Ti [Hama et al., Int. J. Plast., 91(2017), 77.] reproduced the experimental deformation behavior satisfactorily.