A three-dimensional crystal plasticity model for duplex Ti-6Al-4V

A rate dependent crystal plasticity model for the alpha/beta Ti-Al alloy Ti-6Al-4V with duplex microstructure is developed and presented herein. Duplex Ti-6Al-4V is a dual-phase alloy consisting of an hcp structured matrix primary alpha-phase and secondary lamellar alpha + beta domains that are composed of alternating layers of secondary alpha laths and bee structured residual alpha laths. The model accounts for distinct three-dimensional slip geometry for each phase, anisotropic and length scale dependent slip system strengths, the non-planar dislocation core structure of prismatic screw dislocations in the primary alpha-phase, and crystallographic texture. The model is implemented in the general purpose finite element code (ABAQUS, 2005. Ver 6.5, Hibbitt, Karlsson, and Sorensen, Inc., Pawtucket, RI) via a UNIAT subroutine. (C) 2006 Elsevier Ltd. All rights reserved.