Abstract

We report the interception of two titanium hydrides in bulk Ti via additive manufacturing (AM) of hydride-de-hydride (HDH) Ti powders with high H content: nano-sized, stable face-centered cubic (FCC) δ-TiH x plate within α-Ti grains and ultrafine, metastable face-centered tetragonal (FCT) γ-TiH aciculae crossing adjacent α-Ti grain boundaries. Remarkably, the AM bulk Ti achieves a surprising balance of strength and ductility, surpassing those of AM bulk Ti and TC4 alloys. This balance is attributed to effective work hardening from {111} twinning in the FCC δ-TiH x plate, a hindrance to dislocation motion, and high-density dislocation pile-ups around the FCT γ-TiH aciculae dowel connectors.

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