| Abstract Scope |
In this work we aim to uncover the deformation mechanisms and defect evolution characteristics in a recently engineered L-PBF Ti-6Al-4V duplex microstructure. The engineered microstructure benefits from the unique synergy of the α-lath’s strength and plasticity of globular α-grains, significantly improving the tensile ductility (εf=20±1%) as compared to conventionally hot isostatically pressed AM parts, wrought, cast, forged, annealed, aged, and solution-treated counterparts. We uncover the complex interplay between phases (α, β) and microstructural characteristics (laths, globules) responsible for the extended plasticity and retained strength (UTS=1.06±0.02GPa) in the recently developed duplex AM Ti-6Al-4V under tensile loading. Using an adaptive domain misorientation analysis approach of conventional electron backscattered diffraction (EBSD) data, we resolve the heterogenous distribution of strains in the duplex microstructure in the form of complex dislocation cells, and sub-grains enabling an added pathway of deformation via their ease of rotation. |