| Abstract Scope |
In this presentation, we report that a high density of microscale shear bands (MSBs) can be activated in an laser-based directed energy deposition (LDED)-produced Ti-6Al-2Zr-1Mo-1V alloy with dispersed microscale α colonies to enhance its tensile ductility. The local shear stress is determined by the domain size, spatial orientation, and mechanical contrast with vicinal soft domains. The propagation of MSBs can be arrested by the boundaries between hard and soft domains, suppressing the evolution of MSBs into macroscale catastrophic shear bands and, therefore, enhancing tensile ductility. Moreover, we also perform fatigue crack growth tests on single-edge notched samples of Ti-6Al-2Zr-Mo-V alloy prepared by LDED in both as-deposited and heat-treated states, and investigate their fatigue crack growth behaviors. |