Anomalous temperature dependence of the superelastic behavior of Ti–Nb–Mo alloys

Al-Zain, Yazan; Kim, Hee-Young; Koyano, Tomohiro; Hosoda, Hideki; Nam, Tae-Hyun; Miyazaki, S.

doi:10.1016/j.actamat.2010.11.008

Cited by 113 publications

(36 citation statements)

References 36 publications

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“…2533) Particularly, there has been tremendous progress in developing Ti-Nb base shape memory alloys in the past decade and many Ti-Nb base alloys have been developed, e.g. Ti-Nb-Sn, 26,34) Ti-NbAl, 31,32,35) Ti-Nb-Ta, 36,37) Ti-Nb-Zr, 3844) Ti-Nb-Mo, 45,46) TiNb-Pd, 47) Ti-Nb-O, 48) Ti-Nb-N, 49,50) Ti-Nb-Pt, 51) Ti-Nb-TaZr, 5254) Ti-Nb-Zr-Sn, 5557) Ti-Nb-Mo-Sn, 5860) Ti-Zr-NbSn, 61) Ti-Nb-Zr-Al 62) and Ti-Nb-Zr-Mo-Sn. 63) This paper aims to provide an overview of the recent works on Ti-Nb base shape memory alloys.…”

Section: Introductionmentioning

confidence: 99%

Martensitic Transformation and Superelastic Properties of Ti-Nb Base Alloys

2015

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Ti-Nb base alloys have been proposed as prospective candidates for Ni-free biomedical superelastic alloys due to their excellent mechanical properties with good biocompatibility, and many kinds of Ti-Nb base alloys exhibiting shape memory effect or superelasticity have been developed up to now. However, typical Ti-Nb base superelastic alloys show a small recovery strain which is less than one third of the recovery strain of practical Ti-Ni superelastic alloys. Over the last decade there have been extensive efforts to improve the properties of Ti-Nb base superelastic alloys through microstructure control and alloying. Low temperature annealing and aging are very effective to increase the critical stress for slip due to fine subgrain structure and precipitation hardening. The addition of interstitial alloying elements such as O and N raises the critical stress for slip and improves superelastic properties. In this paper, the roles of alloying elements on the martensitic transformation temperature, crystal structure, microstructure and deformation behavior in the Ti-Nb base alloys are reviewed and the alloy design strategy for biomedical superelastic alloys is proposed.

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Section: Introductionmentioning

confidence: 99%

Martensitic Transformation and Superelastic Properties of Ti-Nb Base Alloys

2015

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“…Sn is also biocompatible and Sn addition is capable of improving the cold workability of titanium alloys. 19) Maeshima et al 27) reported that Sn addition is effective in improving the shape memory effect and Sn additions suppress omega (!) phase precipitation in Ti-Mo-Sn alloys.…”

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confidence: 99%

“…It has been reported that the reverse transformation from 00 (orthorhombic) phase to the phase causes shape recovery to appear. [17][18][19] Ti-Cr is also hopeful alloy system for biomedical applications and there are some reports on mechanical properties of Ti-Cr 20,21) and Ti-Cr-X alloys. [22][23][24][25] Selection of Ti-Cr-Sn alloy system was due to phase stabilizing effect of Cr, low melting points of Cr and Sn as compared to other phase stabilizing elements and solid solution strengthening effect of Cr and Sn (atomic radius: Cr ¼ 0:126 nm, Sn ¼ 0:158 nm, Ti ¼ 0:146 nm).…”

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confidence: 99%

Comparative Study of Ti-<I>x</I>Cr-3Sn Alloys for Biomedical Applications

et al. 2011

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In order to replace toxic nickel element from NiTi biomaterials, Ti-Cr and Ti-Cr-X alloys are also new nickel free titanium based alloys for biomedical applications. In this study, comparative study of Ti-xCr-3Sn (x ¼ 4, 5, 6, 7, 8 and 9 mol%) alloys was carried out. Ti-4Cr-3Sn and Ti5Cr-3Sn alloys were composed of 0 martensitic phase (hcp) and other alloys with 6, 7, 8 and 9 mol% Cr were single phase at room temperature. Among the developed alloys, Ti-6Cr-3Sn alloy showed maximum fracture strain, maximum shape memory effect, maximum pseudoelastic response and minimum hardness and minimum yield stress due to transformation of metastable phase to stress induced martensite during mechanical loading. Vickers hardness and UTS has increased and fracture strain has decreased with greater than 6 mol% addition of chromium in Ti-xCr-3Sn alloys due to solid solution strengthening, phase stabilization and slip as dominant deformation mechanism. It is concluded that among the developed Ti-xCr-3Sn alloys, Ti-6Cr-3Sn alloy is hopeful new alloy for biomedical applications.

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“…Double yielding in the β-Ti alloys is reported to be associated with the stress-induced α″ martensitic transformation [306,310]. It can occur if the triggering stress for the stress-induced α″ phase is lower than the yield point for slip of the β phase [311]. In comparison with the cold rolled tubes, a higher post-yield strain hardening rate was observed for the annealed tubes.…”

Section: Tensile Testsmentioning

confidence: 76%

“…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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Anomalous temperature dependence of the superelastic behavior of Ti–Nb–Mo alloys

Cited by 113 publications

References 36 publications

Martensitic Transformation and Superelastic Properties of Ti-Nb Base Alloys

Martensitic Transformation and Superelastic Properties of Ti-Nb Base Alloys

Comparative Study of Ti-<I>x</I>Cr-3Sn Alloys for Biomedical Applications

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

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