Enhanced gradient crystal-plasticity study of size effects in a β-titanium alloy
journal contributionposted on 2017-03-01, 11:12 authored by Murat Demiral, Kai Nowag, Anish RoyAnish Roy, Rudy Ghisleni, Johann Michler, Vadim SilberschmidtVadim Silberschmidt
A calibrated model of enhanced strain-gradient crystal plasticity is proposed, which is shown to characterize adequately deformation behaviour of b.c.c. single crystals of a β-Ti alloy (Ti-15-3-3-3). In this model, in addition to strain gradients evolving in the course of deformation, incipient strain gradients, related to a component's surface-to-volume ratio, is accounted for. Predictive capabilities of the model in characterizing a size effect in an initial yield and a work-hardening rate in small-scale components is demonstrated. The characteristic length-scale, i.e. the component's dimensions below which the size effect is observed, was found to depend on densities of polar and statistical dislocations and interaction between them.
The research leading to these results received funding from the European Union Seventh Framework Programme (FP7/2007-2013) under grant agreement No. PITNGA-2008-211536, project MaMiNa.
- Mechanical, Electrical and Manufacturing Engineering