title: Fatigue performance evaluation of a Nickel-free titanium-based alloy for biomedical application - Effect of thermomechanical treatments.
abstract: In the present work, structural fatigue experiments were performed on a Ti-26Nb alloy subjected to different thermomechanical treatments: a severe cold rolling, a solution treatment and two aging treatments at low-temperature conducted after cold rolling in order to optimize the kinetics of precipitation. The aim is to investigate the effect of microstructural refinement obtained by these processes on fatigue performances. Preliminary tensile tests were performed on each state and analyzed in terms of the microstructure documented by using X-Ray diffraction and TEM analysis. These tests clearly promote the short-time-aged cold-rolled state with a fine α and ω phases precipitation. An interesting balance between mechanical properties such as high strength and low Young's modulus has been obtained. Cyclic bending tests were carried out in air at 0.5%, 1%, 2% and 3% imposed strain amplitudes. At low straining amplitude, where the fatigue performances are at their best, the cold-rolled state does not break at 3×106cycles and the long-time aged precipitation hardened state seems to be a good competitor compared to the cold-rolled state. All failure characteristics are documented by Scanning Electron Microscopy (SEM) micrographs and analyzed in term of microstructure.
authors.affiliation: Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux (LEM3 UMR CNRS 7239), Université de Lorraine, île du Saulcy, 57045 Metz Cedex, France. Electronic address: genevieve.mussot@univ-lorraine.fr.
authors.forename: G
authors.initials: G
authors.lastname: Mussot-Hoinard
authors.affiliation: Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux (LEM3 UMR CNRS 7239), Université de Lorraine, île du Saulcy, 57045 Metz Cedex, France.
authors.forename: W
authors.initials: W
authors.lastname: Elmay
authors.affiliation: ENSAM, 4 Rue Augustin Fresnel, 57070 Metz, France.
authors.forename: L
authors.initials: L
authors.lastname: Peltier
authors.affiliation: Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux (LEM3 UMR CNRS 7239), Université de Lorraine, île du Saulcy, 57045 Metz Cedex, France.
authors.forename: P
authors.initials: P
authors.lastname: Laheurte
mesh_terms: D000497:Alloys / Q000032:analysis*; D001672:Biocompatible Materials / Q000032:analysis*; D055119:Elastic Modulus; D008422:Materials Testing; D009532:Nickel; D013718:Tensile Strength; D014025:Titanium / Q000032:analysis*; D014961:X-Ray Diffraction
chemical_list: D000497:Alloys; D001672:Biocompatible Materials; D009532:Nickel; D014025:Titanium
keywords: Fatigue; Scanning Electron Microscopy; Thermomechanical treatments; Titanium alloy; X-Ray diffraction