Towards uniform and enhanced tensile ductility of additively manufactured Ti−5Al−5Mo−5V−3Cr alloy through designing gradient interlayer deposition time

Ultrauniform, strong, and ductile 3D-printed titanium alloy through bifunctional alloy design

“…This results in highly nonuniform, position-dependent tensile properties from L-PBF, as we demonstrate (Fig. 1, D and E) and as has been demonstrated in other studies across multiple 3D printing technologies ( 27 – 29 ). We show that the single addition (up to 5.0 wt %) of elements from the β-isomorphous group [in this case, we selected Mo; see section on alloy design in the materials and methods ( 30 )] into Ti-5553 powder to form a composite blend achieves bifunctionality: (i) During 3D printing, some of the Mo particles partially melt, but the core survives to nucleate fine grains during solidification and prevent coarse columnar grains from forming.…”

“…We also compared the yield strength and the elongation to failure of Ti-5553+5Mo with those of Ti-5553 (as well as those of Ti-55531 and Ti55511) produced in the as-fabricated L-PBF state and under postprinting heat treatment conditions (Fig. 2C) (29,32,(34)(35)(36)(37)(38). Compared with Ti-5553 and its similar alloys in the asfabricated state, Ti-5553+5Mo shows comparable yield strength but notably higher ductility.…”