title: Mechanical properties and microstructures of β Ti-25Nb-11Sn ternary alloy for biomedical applications.
abstract: The mechanical properties and microstructures of β Ti-25%Nb-11%Sn ternary alloy rods were investigated for biomedical applications as a function of heat treatment temperature after swaging by an 86% reduction in cross-section area. An as-swaged rod consisting of a β (bcc) single phase shows a low Young's modulus of 53 GPa, which is interpreted in terms of both the metastable composition of the β alloy undergoing neither an athermal ω transformation nor a deformation-induced ω transformation and <110>texture development during swaging. Heat treatment at 673 K (400 °C) for 2h leads to a high strength of approximately 1330 MPa and a high spring-back ratio of yield stress to Young's modulus over 15×10(-3), with acceptable elongation. This high strength is attributable to needle-like α precipitates, which are identified by high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) and high-resolution electron microscopy (HREM).
authors.affiliation: Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan.
authors.forename: Taek-Kyun
authors.initials: TK
authors.lastname: Jung
authors.forename: Satoshi
authors.initials: S
authors.lastname: Semboshi
authors.forename: Naoya
authors.initials: N
authors.lastname: Masahashi
authors.forename: Shuji
authors.initials: S
authors.lastname: Hanada
mesh_terms: D000497:Alloys / Q000737:chemistry*; D020811:Biomedical Technology / Q000379:methods*; D055119:Elastic Modulus; D005583:Fourier Analysis; D055595:Mechanical Phenomena; D008855:Microscopy, Electron, Scanning; D010316:Particle Size; D013314:Stress, Mechanical; D013696:Temperature; D013718:Tensile Strength; D014961:X-Ray Diffraction
chemical_list: D000497:Alloys; C585965:beta Ti-25Nb-11Sn alloy
keywords: Strength; Young's modulus; α precipitation; β titanium alloy