A dislocation density-based crystal plasticity constitutive model for prismatic slip in α-titanium
Abstract
A new constitutive plasticity model for prismatic slip in hexagonal α-titanium is developed. In the concept pure edge and screw dislocation densities evolve on the { 1 0 1 bar 0 } 〈 1 2 bar 1 0 〉 slip systems. The model considers that the screw dislocation segments have a spread out core, leading to a much higher velocity of edge compared with screw dislocations. This enables the model to describe the observed transition in strain hardening from stage I to stage II in single crystals oriented for prismatic slip. Good agreement is found between the experimentally observed and simulated stress-strain behavior.
- Publication:
-
Acta Materialia
- Pub Date:
- 2011
- DOI:
- 10.1016/j.actamat.2011.07.053
- Bibcode:
- 2011AcMat..59.7003A
- Keywords:
-
- Titanium;
- Crystal plasticity;
- Single crystal;
- Dislocations