High-temperature dual-phase crystal plasticity modeling of Ti-6Al-4V alloy: Insights into anisotropic behavior and microstructural evolution

The high-temperature dual-phase anisotropic crystal plasticity model has been established to investigate the anisotropic behavior and microstructural evolution mechanisms of Ti-6Al-4V alloy under elevated temperature conditions. The model was rigorously validated using uniaxial hot tensile testing and comprehensive microstructural analysis , confirming its predictive accuracy. The findings reveal that the yield strength is predominantly influenced by the dislocation density within the prismatic slip systems of the α phase . Moreover, a strong positive correlation between dislocation density and slip shear strain was observed, highlighting their mutual dependence in governing deformation mechanisms . Under diagonal loading conditions, regions of high dislocation density exhibited distinct textural features, further elucidating the material's anisotropic response. These results provide a deeper understanding of the interrelations among dislocation density, yield strength, and slip mechanics, while emphasizing the pivotal role of texture in shaping the anisotropic properties of Ti-6Al-4V alloy under high-temperature conditions. • High-temperature anisotropic CP model captures Ti-6Al-4V alloy mechanical behavior under complex loading. • α-phase prismatic slip systems' dislocation density dominates yield strength. • The dislocation density positively correlates with slip shear strain.