title: Effects of thermomechanical process on the microstructure and mechanical properties of a fully martensitic titanium-based biomedical alloy.
abstract: Thermomechanical treatments have been proved to be an efficient way to improve superelastic properties of metastable β type titanium alloys through several studies. In this paper, this treatment routes, already performed on superelastic alloys, are applied to the Ti-24Nb alloy (at%) consisting of a pure martensite α'' microstructure. By short-time annealing treatments performed on the heavily deformed material, an interesting combination of a large recoverable strain of about 2.5%, a low elastic modulus (35 GPa) and a high strength (900 MPa) was achieved. These properties are shown to be due to a complex microstructure consisting of the precipitation of nanoscale (α+ω) phases in ultra-fine β grains. This microstructure allows a superelastic behavior through stress-induced α'' martensitic transformation. In this study, the microstructures were characterized by X-ray diffraction and transmission electron microscopy and the evolution of the elastic modulus and the strain recovery as a function of the applied strain was investigated through loading-unloading tensile tests.
authors.affiliation: Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux LEM3 (UMR CNRS 7239), ENSAM, Ile de Saucly, F-57045 Metz, France. wafa.elmay@ensam.eu
authors.forename: W
authors.initials: W
authors.lastname: Elmay
authors.forename: F
authors.initials: F
authors.lastname: Prima
authors.forename: T
authors.initials: T
authors.lastname: Gloriant
authors.forename: B
authors.initials: B
authors.lastname: Bolle
authors.forename: Y
authors.initials: Y
authors.lastname: Zhong
authors.forename: E
authors.initials: E
authors.lastname: Patoor
authors.forename: P
authors.initials: P
authors.lastname: Laheurte
mesh_terms: D000497:Alloys / Q000737:chemistry*; D001672:Biocompatible Materials / Q000737:chemistry*; D006244:Hardness; D055595:Mechanical Phenomena; D009556:Niobium / Q000737:chemistry; D012996:Solutions; D013696:Temperature; D013718:Tensile Strength; D014025:Titanium / Q000737:chemistry*
chemical_list: D000497:Alloys; D001672:Biocompatible Materials; D012996:Solutions; D009556:Niobium; D014025:Titanium