title: Microstructures and mechanical properties of metastable Ti-30Zr-(Cr, Mo) alloys with changeable Young's modulus for spinal fixation applications.
abstract: In order to develop a novel alloy with a changeable Young's modulus for spinal fixation applications, we investigated the microstructures, Young's moduli, and tensile properties of metastable Ti-30Zr-(Cr, Mo) alloys subjected to solution treatment (ST) and cold rolling (CR). All the alloys comprise a β phase and small athermal ω phase, and they exhibit low Young's moduli after ST. During CR, deformation-induced phase transformation occurs in all the alloys. The change in Young's modulus after CR is highly dependent on the type of deformation-induced phase. The increase in Young's modulus after CR is attributed to the deformation-induced ω phase on {3 3 2} mechanical twinning. Ti-30Zr-3Cr-3Mo (3Cr3Mo), which exhibits excellent tensile properties and a changeable Young's modulus, shows a smaller springback than Ti-29Nb-13Ta-4.6Zr, a β-type titanium alloy expected to be useful in spinal fixation applications. Thus, 3Cr3Mo is a potential candidate for spinal fixation applications.
authors.affiliation: Department of Materials Science, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan.
authors.forename: Xiaoli
authors.initials: X
authors.lastname: Zhao
authors.forename: Mitsuo
authors.initials: M
authors.lastname: Niinomi
authors.forename: Masaaki
authors.initials: M
authors.lastname: Nakai
authors.forename: Goro
authors.initials: G
authors.lastname: Miyamoto
authors.forename: Tadashi
authors.initials: T
authors.lastname: Furuhara
mesh_terms: D000497:Alloys / Q000737:chemistry*; D002857:Chromium / Q000737:chemistry; D055119:Elastic Modulus; D020007:Implants, Experimental; D008422:Materials Testing; D046529:Microscopy, Electron, Transmission; D008982:Molybdenum / Q000737:chemistry; D013131:Spine / Q000502:physiology*; D013314:Stress, Mechanical; D013718:Tensile Strength / Q000502:physiology; D023822:Tissue Engineering / Q000379:methods*; D014025:Titanium / Q000737:chemistry; D014961:X-Ray Diffraction; D015040:Zirconium / Q000737:chemistry
chemical_list: D000497:Alloys; D002857:Chromium; D008982:Molybdenum; D015040:Zirconium; D014025:Titanium