Lattice modulation and superelasticity in oxygen-added β-Ti alloys

Tahara, Masaki; Kim, Hee-Young; Inamura, Tomonari; Hosoda, Hideki; Miyazaki, S.

doi:10.1016/j.actamat.2011.06.015

Cited by 231 publications

(114 citation statements)

References 38 publications

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“…In a recent work (Tahara et al, 2011), it was shown that the addition of 1 at.% O in a Ti23Nb-1.0O (at.%) alloy composition produces nanosized modulated domains in the β matrix and it was suggested that these domains could suppress long-range martensitic transformation.…”

Section: Microstructure After Deformationmentioning

confidence: 99%

Microstructure and mechanical behavior of superelastic Ti–24Nb–0.5O and Ti–24Nb–0.5N biomedical alloys

Ramarolahy

Castany

Prima

et al. 2012

Journal of the Mechanical Behavior of Biomedical Materials

130

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To cite this version:A. Ramarolahy, Philippe Castany, F. Prima, P. Laheurte, Isabelle Péron, et al.. Microstructure and mechanical behavior of superelastic Ti-24Nb-0.5O and Ti-24Nb-0.5N biomedical alloys.Journal AbstractIn this study, the microstructure and the mechanical properties of two new biocompatible superelastic alloys, Ti-24Nb-0.5O and Ti-24Nb-0.5N (at.%), were investigated. Special attention was focused on the role of O and N addition on α ″ formation, supereleastic recovery and mechanical strength by comparison with the Ti-24Nb and Ti-26Nb (at.%) alloy compositions taken as references. Microstructures were characterized by optical microscopy, X-ray diffraction and transmission electron microscopy before and after deformation. The mechanical properties and the superelastic behavior were evaluated by conventional and cyclic tensile tests. High tensile strength, low Young's modulus, rather high superelastic recovery and excellent ductility were observed for both superelastic Ti-24Nb-0.5O and Ti24Nb-0.5N alloys. Deformation twinning was shown to accommodate the plastic deformation in these alloys and only the {332} 113 twinning system was observed to be activated by electron backscattered diffraction analyses.

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Section: Microstructure After Deformationmentioning

confidence: 99%

Microstructure and mechanical behavior of superelastic Ti–24Nb–0.5O and Ti–24Nb–0.5N biomedical alloys

Ramarolahy

Castany

Prima

et al. 2012

Journal of the Mechanical Behavior of Biomedical Materials

130

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“…23) They also observed the ¢-phase lattice modulation morphologies, which are referred to as "nanodomains", and suggested that this lattice modulation is caused by the distributed oxygen atoms and the related local strain fields. However, the lattice modulation appears in both TiNb and TiNbO alloys.…”

Section: Lattice Modulation In Electron Diffraction Patternsmentioning

confidence: 99%

“…Moreover, lattice modulation occurs in the ¢-phase. Lattice modulation is caused by a transverse wave consistent with the displacement of atoms in the [110] direction, which is common in TiNb-based alloys with low reported e/a, such as (Ti23Nb)1.0O alloy (e/a = 4.23) 23) and binary Ti29Nb alloy (e/a = 4.29). 24) In addition, the intensity of diffuse satellites is characteristic of changes in lattice modulation due to uniaxial stress.…”

Section: Introductionmentioning

confidence: 99%

“…24) In addition, the intensity of diffuse satellites is characteristic of changes in lattice modulation due to uniaxial stress. 23) However, the detailed relation between the lattice modulation and the ¢-phase stability has not necessarily been clearly understood yet. The purposes of this study, therefore, are to understand the relation between the lattice modulation and/or ½-phase transformation and the physical properties (i.e., the electrical resistivity and specific heat) of the binary TixNb single crystals and to discuss the relation between the existence of lattice modulation and phase stability for the ¢-phase of TixNb single crystals for (28¯x¯40) that exhibit e/a ratios between 4.28 and 4.40.…”

Section: Introductionmentioning

confidence: 99%

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β-Phase Instability in Binary Ti–<i>x</i>Nb Biomaterial Single Crystals

2013

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The ½-phase transformation and ¢-phase stability in TixNb (28¯x¯40 at%) single crystals were investigated using electrical resistivity measurements, transmission electron microscopy (TEM) observations, and specific heat measurements. The crystal for x = 28 exhibits distinct anomalous negative temperature dependence of the resistivity coefficient and thermal hysteresis accompanied by the presence of the athermal ½-phase and ¢-phase lattice modulation. Although the crystal for x = 30 appears in the ¢-phase lattice modulation, it does not exhibit a clear negative temperature dependence of the resistivity coefficient or the athermal ½-phase. The crystal of x = 30 also shows a relatively high absolute value of resistivity at 15 K among the crystals for 28¯x¯40 and a low Debye temperature in a normal conductive state. The crystal for x = 30 that shows the lattice modulation, high resistivity, and low ¢-phase Debye temperature correspond to the low stability of the ¢-phase. Moreover, the stability strongly depends on the Nb content of the binary TiNb crystal.

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“…Al-Zain et al and Tahara et al performed in situ X-ray diffraction studies on Ti-26Nb and Ti-13Nb-4Mo alloys (at%) and detected the SIM α″ phase transformation [144,145]. The α″ phase is shown to be formed from 0.2% to 2.5% of strain and to be partially reversible after unloading from 2.5% strain [144][145][146]. These experiments were performed using a deformation of 2.5% which was followed by unloading.…”

Section: Identification Of α″ Phasementioning

confidence: 99%

Mechanical and microstructural characterisation in the processing of biomedical metallic fine tubes

Yao-wu¹

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Fine tube stents are used for maintaining localised flow in stenotic blood vessels. Elasticity and plasticity for expansion, rigidity for resisting bending under force and strength to prevent unexpected failure, are required properties of the tubes from which these stents are formed. Biomedical metastable β titanium alloys have been developed as implant materials for a large number of biomedical applications due to a combination of favourable characteristics, e.g. good biocompatibility, excellent toughness and corrosion resistance. A metastable β alloy, Ti-25Nb-3Mo-3Zr-2Sn, has been developed without toxic alloying elements, which is a promising candidate material for stent applications. Metallic materials used for stents are commonly not biodegradable and implanted in the vessel permanently, which may provoke in-stent restenosis and stent thrombosis. In order to remove the implanted materials after service, biodegradable materials, absorbed by the body slowly, are also a field of research interest. Magnesium alloys have been used in studies for biomedical stent applications as a new biodegradable material. Magnesium stents can reopen the blocked blood vessels temporarily before degrading in physiological environments. In addition to the biodegradable characteristics, their mechanical properties are reasonable. The Mg-3Al-1Zn (AZ31) alloy is the subject of some research on the processing of biomedical magnesium alloys as it is a commonly available commercial alloy. Consequently, the Ti-25Nb-3Mo-3Zr-2Sn alloy and the AZ31 magnesium alloy have been used in this thesis to investigate the evolution of mechanical properties and microstructure in the processing of fine tubes.The deformation mechanisms during cold deformation of metastable β titanium alloys are mainly associated with martensitic phase transformations and mechanical twinning. It has been reported that stress-induced phase transformations and {112}〈111〉, {332}〈113〉 twinning modes may be activated under different stress states in metastable β titanium alloys. They can exhibit varying elasticity, Young's modulus and strain hardening behaviour. Because the martensitic start temperature is below room temperature for most metastable β titanium alloys, the α″ martensitic transformation can easily occur under a small amount of external stress. Mechanical twins were reported to hinder slip and dislocation motion thereby increasing the strain hardening rate. The development of β and α″ texture during processing is another critical influence on the mechanical properties of fine tubes. Therefore, studies on the martensitic transformation, mechanical twins and texture evolution is of significance in order to understand the processing of β titanium fine tubes.ii Magnesium alloys deform through the formation of a large amount of mechanical twins due to the relatively low critical stress to activate twinning in comparison with 〈 + 〉 slip. There are typically two primary mechanical twinning modes for magnesium alloys, {101 ̅ 2} extension twins and {101 ̅ 1} cont...

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Lattice modulation and superelasticity in oxygen-added β-Ti alloys

Cited by 231 publications

References 38 publications

Microstructure and mechanical behavior of superelastic Ti–24Nb–0.5O and Ti–24Nb–0.5N biomedical alloys

Microstructure and mechanical behavior of superelastic Ti–24Nb–0.5O and Ti–24Nb–0.5N biomedical alloys

β-Phase Instability in Binary Ti–<i>x</i>Nb Biomaterial Single Crystals

Mechanical and microstructural characterisation in the processing of biomedical metallic fine tubes

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Lattice modulation and superelasticity in oxygen-added β-Ti alloys

Cited by 231 publications

References 38 publications

Microstructure and mechanical behavior of superelastic Ti–24Nb–0.5O and Ti–24Nb–0.5N biomedical alloys

Microstructure and mechanical behavior of superelastic Ti–24Nb–0.5O and Ti–24Nb–0.5N biomedical alloys

&beta;-Phase Instability in Binary Ti&ndash;<i>x</i>Nb Biomaterial Single Crystals

Mechanical and microstructural characterisation in the processing of biomedical metallic fine tubes

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β-Phase Instability in Binary Ti–<i>x</i>Nb Biomaterial Single Crystals