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

• Published in: Journal of alloys and compounds Vol. 576; pp. 170 - 176
• Main Authors: Cojocaru, V.D., Raducanu, D., Gordin, D.M., Cinca, I.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 05.11.2013; Elsevier
• Subjects: Chemical Sciences; Cold rolling; Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; Deformation and plasticity (including yield, ductility, and superplasticity); Exact sciences and technology; Fatigue, brittleness, fracture, and cracks; Grains; Material chemistry; Materials science; Mechanical and acoustical properties of condensed matter; Mechanical properties of solids; Methods of nanofabrication; Nanocrystalline materials; Nanoscale materials and structures: fabrication and characterization; Numerical control; Orientation; Physics; Spreads; Surface layer; Texture; Texture analysis; Titanium alloys; Titanium base alloys; Ultra-fine grained materials; Ultra-fine grained materials; Titanium alloys; Texture analysis; Ultimate strength method; Ruptures; Material processing; Plastic deformation; Nanostructures; Texture; Tensile strength; Fibers; Cold rolling; Fractures; Recrystallization; Fine grain structure; Thermomechanical treatments; Cold deformation; Microstructure; Nanocrystal; Nanomaterial synthesis; Elongation (mechanics)
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2013.04.125

•Nanostructured/ultra-fine grained structure easily obtained by TM processing.•Microstructure consisting in a mixture of β-Ti/α″-Ti phases.•High ultimate tensile strength (2423 MPa) and low elongation to fracture (1.46 %).•Presence of high intensity rolling texture components and texture fibres. 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 26nm in the case of β-Ti grains and respectively 33nm in the case of α″-Ti grains. This NC microstructure exhibits a combination of high ultimate tensile strength (2423MPa) and low elongation to fracture (1.46%). Obtained texture by TM processing shows a strong {001}〈110〉 texture component, main orientation component spreading from {001}〈11¯0〉 to {001}〈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 {111}〈11¯0〉 to {111}〈1¯1¯2〉, while in the case of α-fibre the main orientation component spreads from {001}〈11¯0〉 to {112}〈11¯0〉.