Texture in ultra-strength Ti-25Ta-25Nb alloy strips

A Ti-25Ta-25Nb (wt%) alloy was subjected to a thermo-mechanical (TM) processing route consisting in following stages: plastic deformation by cold-rolling - recrystallization treatment - plastic deformation by cold-rolling. The aim was to promote formation of a nanocrystalline (NC) microstructure consisting of β-Ti and α″-Ti grains, with an average nanocrystalline domain size close to 26 nm in the case of β-Ti grains and respectively 33 nm in the case of α″-Ti grains. This NC microstructure exhibits a combination of high ultimate tensile strength (2423 MPa) and low elongation to fracture (1.46%). Obtained texture by TM processing shows a strong {0 0 1}〈1 1 0〉 texture component, main orientation component spreading from {0 0 1}〈11¯0〉 to {0 0 1}〈1¯1¯0〉. High intensity texture fibres (γ-fibre and α-fibre) were obtained also. In the case of γ-fibre the main orientation component spreads from {1 1 1}〈11¯0〉 to {1 1 1}〈1¯1¯2〉, while in the case of α-fibre the main orientation component spreads from {0 0 1}〈11¯0〉 to {1 1 2}〈11¯0〉.