Effects of the crystallographic and spatial orientation of α lamellae on the anisotropic in-situ tensile behaviors of additive manufactured Ti–6Al–4V

Abstract Columnar grain morphology and typical α texture transformed from a strong β //VD fiber texture are found in the Ti–6Al–4V alloy fabricated using electron beam rapid manufacturing (EBRM). This study mainly focused on the effect of the columnar grain morphology and the lamellar α orientation on the tensile damage behavior of the alloy. Samples in three different orientations were subjected to in-situ tensile tests. Results demonstrated that obvious anisotropic in-situ tensile behavior was presented in the alloy. Based on the columnar grain morphology and the β //VD fiber texture, we analyzed the crystallographic and spatial orientation characteristics of α lamellae in the alloy, discussed the effect of the columnar grain morphology, the crystallographic and spatial orientations of α lamellae on anisotropic in-situ tensile behaviors, and proposed that the crystallographic texture of α phase was a main factor inducing anisotropic tensile properties. In addition, the anisotropic fracture displacement was also associated with the spatial orientation of α laths.