An improved combination of tensile strength and ductility in titanium alloys via oxygen ordering - DES Saclay Accéder directement au contenu
Article Dans Une Revue Materials Science and Engineering: A Année : 2023

An improved combination of tensile strength and ductility in titanium alloys via oxygen ordering

Résumé

Oxygen content has always been limited in commercial titanium and titanium alloys due to its propensity to induce a severe ductility loss. Yet, its effect on the macroscopical behavior has never been clearly understood and is still rather unclear considering the wide variability in the literature results. Here, we investigate the tensile properties of α-titanium with oxygen contents ranging from 0.15 to 0.80 weight percent (wt%). While the strain-hardening ability of oxygen is maintained, no ductility drop is observed up to 0.60 wt% of oxygen, thus allowing exceptional combinations of mechanical properties with an ultimate tensile strength (UTS) of 800 MPa and 29% of elongation at fracture for the Ti-0.6O alloy. Both high strength and ductility of these alloys result from the dislocations/precipitate's interactions. It is proposed that these interactions induce an important cross-slip ac­tivity responsible for a dislocation multiplication and a high work-hardening rate. With the addition of Zr, alloys exhibit an even more promising combination of mechanical properties, achieving 1,075 MPa of UTS and 28% of elongation at fracture for the Ti-4.5Zr-0.8O alloy. The mechanical properties of TiO and TiZrO alloys brought out in this study surpass those of Ti-6Al-4V alloy and open significant prospects for developing a new generation of oxygen-tolerant titanium alloys.
Fichier principal
Vignette du fichier
Amann2023_MSEA_preprint.pdf (1.02 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

cea-03972983 , version 1 (03-02-2023)

Identifiants

Citer

Fabienne Amann, Régis Poulain, Stéphanie Delannoy, Jean-Philippe Couzinié, Emmanuel Clouet, et al.. An improved combination of tensile strength and ductility in titanium alloys via oxygen ordering. Materials Science and Engineering: A, 2023, 867, pp.144720. ⟨10.1016/j.msea.2023.144720⟩. ⟨cea-03972983⟩
46 Consultations
42 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More