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

Tensile properties of Ti-6Al-4V as-built by laser metal deposition: The relationship between heat affected zone bands, strain localization and anisotropy in ductility

“…The authors also reported that the anisotropy in ductility may result from deformation concentration in β grains with lower strength, where the distribution of α variants is more favorable to plastic deformation. A similar study was carried out by Liu et al who confirmed the role of the crystallographic texture of the α phase but observed that the spatial orientation of α lamellas is of importance as well [37]. Using high resolution digital image correlation, Book et al confirmed that strain accumulation occurs in lamellas with a major axis approximately 45 ° to the loading direction [38].…”

Anisotropy in the Tensile Properties of a Selective Laser Melted Ti-5Al-5Mo-5V-1Cr-1Fe Alloy during Aging Treatment

“…This is consistent with the present work ( Table 4 ). Furthermore, when the models of Wang et al [ 4 , 7 , 22 ] are used to explain the mechanical anisotropy properties of AM alloys, it should be noted that there may be some deviations or even errors (i.e., the tensile strength of the angled (45°) sample in the current work).…”

“…For instance, Hrabe et al showed that the distance of the laser source from built plate, part size, and orientation of the XY-plane have a slight effect on the microstructure and mechanical properties of EBMed Ti-6Al-4V alloy [ 2 , 3 ]. Liu et al suggested that columnar grain morphology and crystallographic texture are the main factors causing anisotropic behaviors [ 4 , 5 , 6 , 7 ]. Carroll et al found that the anisotropy in ductility of DEDed Ti-6Al-4V is attributed to the columnar prior β grains morphology as well as the presence of the grain boundary α, which serves as a path along which damage can preferentially accumulate, leading to fracture [ 8 ].…”

“…Liu et al indicated that the effective slip path for a sample loaded along the vertical direction is approximately equal to that in the horizontal direction. In the meantime, the effective slip path for the sample loaded along the 45° direction is obviously longer than that of the two directions above [ 4 ].…”

Effects of Post Heat Treatments on Microstructures and Mechanical Properties of Selective Laser Melted Ti6Al4V Alloy

“…Meanwhile, the discontinuous GB-α in the 950-AC sample led to the fracture mixed with the intercrystalline and transgranular modes and resulted in consistent ductility in both the vertical and horizontal directions. The strength difference in AMed titanium alloys caused by the crystallographic texture and the crystallographic orientation of α lath, which is attributed to that crystallographic orientation can affect the deformation behavior of grains [42,47,48]. Furthermore, the different morphology of GB-α also affects the strength difference between the horizontal direction and vertical direction, because the presence of continuous GB-α leads to a significant reduction of fracture resistance, which decreases the tensile strength of the samples [22,49].…”