Influence of microstructural changes on corrosion behaviour of thermally aged Ti‐6Al‐7Nb alloy

Thair, L.; Mudali, U. Kamachi; Raj, Baldev

doi:10.1002/maco.200303724

Cited by 27 publications

(25 citation statements)

References 22 publications

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“…It was observed that the corrosion resistance of titanium alloys with Nb and Fe is marginally better than that of the Ti6Al4V alloy under physiological conditions (pH ¼ 8). This was explained by the lower solubility of the Nb ion in comparison with Al and V in the Ti6Al4V [21].…”

Section: Resultsmentioning

confidence: 99%

Electrochemical characteristics of titanium based biomaterials in artificial saliva

Mareci

Ungureanu

Aelenei

et al. 2007

Materials & Corrosion

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In the last decade, new titanium alloys have been developed in different areas of dentistry, such as Ti6Al7Nb, Ti6Al2Nb1Ta1Nb, and Ti5Al2.5Fe. The aim of this study was to compare the Ti6Al7Nb, Ti6Al2Nb1Ta1Nb, Ti5Al2.5Fe, and Ti6Al4V alloys with the commercial titanium, regarding the corrosion resistance in artificial saliva. In the electrochemical estimations the polarization data are converted into instantaneous corrosion rate values (I corr ). The passivation properties were comparable for the four alloys. The EIS spectra are best fitted using an equivalent circuit (EC), which corresponds to the model of a two-layer structure for the passive film. High impedance values (in the order of 10 6 V cm 2 ) were obtained from medium to low frequencies for all materials suggesting high corrosion resistance in artificial saliva.The electrochemical and corrosion behavior of Ti6Al4V is not affected on substituting vanadium with niobium, iron, molybdenum, and tantalum.

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Section: Resultsmentioning

confidence: 99%

Electrochemical characteristics of titanium based biomaterials in artificial saliva

Mareci

Ungureanu

Aelenei

et al. 2007

Materials & Corrosion

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“…Some authors (12) report that Ta addition decreases corrosion in titanium alloys thanks to formation of Ta 2 O 5 on the upper surface that strongly reduces exchange of ions between material and surrounding tissue. There is a signifi cant reduction of the exchange rate when compared to those titanium alloys forming only TiO 2 (13). Therefore, titanium alloys having Ta are considered promising dental materials with minimized corrosion behavior (14).…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties and microstructure of Ti-35.5Nb-5.7Ta beta alloy

Bartáková¹,

Prachár²,

Dvořák³

et al. 2015

BLL

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Abstract:Objective:Titanium and titanium alloys represent generally accepted metallic biomaterials for clinical dentistry and dental implantology. In th is paper, we present a Ti-35.5Nb-5.7Ta alloy with a special respect to its microstructure and mechanical characteristics, such as Young modulus of elasticity. Methods:Three thermal treatments differing in temperature and time of annealing were used during the Ti-35.5Nb-5.7Ta processing in order to evaluate the effects of ageing, melting annealing, and annealing on mechanical characteristics and microstructure. Results: Using microscopy, the alloy was analyzed and the differences in shares of beta phase grains, alpha particles and precipitates evaluated. The three thermal treatments were evaluated also from technological point of view. Conclusion:The following thermal treatment was found optimal for the Ti-35.5Nb-5.7Ta alloy: melting annealing at 800 °C for 0.5 hour followed by a cold swaging with a 52-79 % deformation, and fi nal hardening at 500 °C for 2 hours in water (Tab. 2, Fig. 3, Ref. 24).Text in PDF www.elis.sk.

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“…The corrosion resistance of the titanium bioalloys varies with their composition, structural statement as a result of thermo-mechanical processing and with the content of the biofluid [22][23][24][25][26][27][28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

“…Of special interest for biomedical applications are the alloys: Ti-6Al-7Nb [23,24], Ti-13Nb-13Zr [8,17], Ti-15Mo-5Zr-3Al (developed by Kobe Steel Ltd., Japan) [33], Ti-12Mo-6Zr-2Fe [34], Ti-30Nb, Ti-30Ta [35], etc.…”

Section: Introductionmentioning

confidence: 99%

Mechanical and corrosion behaviour of a Ti‐Al‐Nb alloy after deformation at elevated temperatures

Popa

Răducanu

Vasilescu

et al. 2008

Materials & Corrosion

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The mechanical properties of Ti6Al7Nb alloy deformed and heat treated at elevated temperatures were correlated with its microstructure and corrosion behaviour in Ringer (of different pH values: 2.49, 6.9 and 8.9) and Ringer-Brown solutions. Microstructural analysis revealed a Widmanstatten structure for the alloys deformed at 1100 8C (b field) and structure with a grains at 930 8C (a þ b field). The thermo-mechanical processing improved the electrochemical behaviour of Ti6Al7Nb alloys, especially their passive state. Open circuit potential variations in time reflected more compact, stable, resistant passive films on the surface of the treated alloys. Open circuit potential gradients simulating the nonuniformities of pH along the implant surface have very low values that cannot generate galvanic corrosion. Corrosion rates and ion release are very much reduced. Impedance spectra were fitted with a two time-constants equivalent circuit for some alloys and with three time-constants equivalent circuit for other alloys.

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Influence of microstructural changes on corrosion behaviour of thermally aged Ti‐6Al‐7Nb alloy

Cited by 27 publications

References 22 publications

Electrochemical characteristics of titanium based biomaterials in artificial saliva

Electrochemical characteristics of titanium based biomaterials in artificial saliva

Mechanical properties and microstructure of Ti-35.5Nb-5.7Ta beta alloy

Mechanical and corrosion behaviour of a Ti‐Al‐Nb alloy after deformation at elevated temperatures

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