Pseudoelastic behaviour of a β Ti–25Nb–3Zr–3Mo–2Sn alloy

Kent, Damon; Wang, Gui; Yu, Zhentao; Dargusch, Matthew S.

doi:10.1016/j.msea.2009.11.059

Cited by 67 publications

(35 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Ti-Mo based alloys and Ti-Nb based alloys with high elasticity have been reported to be favourable for stent applications. Their superior elasticity lowers the risk of damage to the stent during inserting into the body and in service [7][8][9][10][11][12].…”

Section: 1mentioning

confidence: 99%

“…A metastable β Ti alloy, Ti-25Nb-3Mo-3Zr-2Sn (wt.%), was developed by Yu et al [20] and has been investigated as a promising material for biomedical applications [12,18,19,[21][22][23]. The Ti-25Nb-3Zr-3Mo-2Sn alloy has a low modulus, high strength and exhibits considerable plasticity and pseudoelastic character.…”

Section: 1mentioning

confidence: 99%

“…Because β phase has much lower elastic modulus than α phase and exhibits excellent toughness, corrosion resistance and biocompatibility, a series of metastable β-Ti alloys composed of non-toxic elements (Nb, Ta, Zr, Mo, etc) have been developed and are receiving increasing attention for stent applications [91]. Ti-V-based, Ti-Mo-based and Ti-Nb-based β alloys have been reported to display shape memory and superelastic behaviours [12,92,93], which are desirable characteristics for many biomedical applications. For the application of stents, the large elastic strains in β-Ti alloys reduce the risk of damage to the stent both during delivery into the body and after being deployed in the target location [94].…”

Section: Metastable β-Titanium Alloysmentioning

confidence: 99%

“…Depending on the Nb content, binary Ti-Nb alloys can display a fully α″ martensitic microstructure at room temperature and thus exhibit shape memory properties [12,113].…”

Section: 2mentioning

confidence: 99%

“…Ti-V-based alloys [300], Ti-Mo based alloys [7] and Ti-Nb-based alloys [9][10][11][12] β-Ti alloys have been reported to display shape memory and superelastic behaviours [5]. They are favourable for the application of stents: the large elastic strains in β-Ti alloys reduce the risk of damage to the stent both during delivery into the body and operation [8].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

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

Yao-wu¹

View full text Add to dashboard Cite

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...

show abstract

Section: 1mentioning

confidence: 99%

Section: 1mentioning

confidence: 99%

Section: Metastable β-Titanium Alloysmentioning

confidence: 99%

“…Depending on the Nb content, binary Ti-Nb alloys can display a fully α″ martensitic microstructure at room temperature and thus exhibit shape memory properties [12,113].…”

Section: 2mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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

Yao-wu¹

View full text Add to dashboard Cite

show abstract

In vitro response of preosteoblastic MG63 cells on Ni‐free Ti shape memory substrates

et al. 2013

View full text Add to dashboard Cite

Ni-free Ti alloys are a potential strategy to overcome the risk of Ni-adverse reactions and rigidity mismatch for implant materials. Here, we report the biological behavior induced for two promising candidate alloys--Ti19.1Nb8.8Zr (M(S) temperature of 46°C and elastic modulus of 74 GPa) and Ti41.2Nb6.1Zr (elastic modulus of 67 GPa)--on cultured MG63 cells, as well as their physical and chemical properties. Contact angle results revealed the hydrophobic character of the former alloy (59.02° ± 2.35°) attributed to the presence of the martensitic phase, while the latter one presented a hydrophilic response (67.77° ± 2.78°). Results showed also that the cell adhesion response (after 4 and 8 h of incubation) in both substrates was not statistically different to that obtained in the cp Ti as control material. These surfaces induced well spread cell morphology with cytoplasmic extension like filopodia of up to 100 μm even at short culture times and presented an uninterrupted proliferation after longer incubation times (9 days). A decrement in the proliferation rate was appreciated from the Ti19.1Nb8.8Zr surface at that time, which was attributed to an earlier activation of the cell differentiation stage, as confirmed by the twofold increment of alkaline phosphatase activity. The results also evidenced that the presence of a 2 nm thick layer of amorphous Nb₂O₅, which was detected on both alloys, has a significant effect on cell behavior favoring the cell adhesion and morphology response of the new alloys studied.

show abstract

Thermal analysis of precipitation reactions in a Ti–25Nb–3Mo–3Zr–2Sn alloy

et al. 2012

View full text Add to dashboard Cite

A study was undertaken on a Ti-25Nb-3Mo-3Zr-2Sn alloy using differential scanning calorimetry (DSC) in order to improve understanding of the precipitation reactions occurring during aging heat treatments. The investigation showed that isothermal ω phase can be formed in the cast and solution treated alloy at low aging temperatures. An exothermic peak in the temperature range of 300 to 400°C was detected for precipitation of the ω phase, with approximate activation energy of 176 kJ/mol. The ω phase begins to dissolve at temperatures around 400°C and precipitation of the α phase is favoured at higher temperatures between 400°C and 600°C. An exothermic peak with activation energy of 197 kJ/mol was measured for precipitation of the α phase. Deformation resulting in the formation of the stress induced α phase altered the DSC heating profile for the solution treated alloy. The exothermic peak associated with precipitation of the ω phase was not detected during heating of the deformed material and increased endothermic heating associated with recovery and recrystallisation was observed.

show abstract

Pseudoelastic behaviour of a β Ti–25Nb–3Zr–3Mo–2Sn alloy

Cited by 67 publications

References 29 publications

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

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

In vitro response of preosteoblastic MG63 cells on Ni‐free Ti shape memory substrates

Thermal analysis of precipitation reactions in a Ti–25Nb–3Mo–3Zr–2Sn alloy

Contact Info

Product

Resources

About