Interactions between wear and corrosion on cast and sintered Ti-12Nb alloy in comparison with the commercial Ti-6Al-4V alloy

This work investigates the corrosion and tribocorrosion behavior of alpha + beta Ti-12Nb alloy processed by casting and sintering, in 9 g/l NaCl solution at body temperature, and compares the results with the commercial Ti-6Al-4 V alloy. Different electrochemical techniques were used to access the corrosion behavior. Tribocorrosion behavior was studied at open circuit potential under continuous and intermittent sliding, and at anodic potentiostatic condition under continuous sliding. Results revealed that Ti-12Nb alloys presented similar tribocorrosion behavior although the sintered one exhibited a better corrosion behavior. Nevertheless, Ti-6Al-4 V presented better overall degradation resistance than both Ti-12Nb alloys.- This work was supported by FCT national funds, under the national support to R&D units grant, through the reference project UIDB/04436/2020 and UIDP/04436/2020, together with M-ERA-NET/0001/2015, and co-supported by Brazilian agencies CNPq [grants #308.204/2017-4 and #125.954/2018-2] and FAPESP M-ERA-NET [grant #2015/50.280-5], also by MINECO (Spain) through the program PCIN-2016-123 and the Ramon y Cajal project RYC-2014-15014. I. Caha is grateful for a PhD grant under the NORTE-08-5369-FSE-000012 project

Interstitial oxygen's influence on the corrosion behavior of Ti-9Mo alloys

Titanium and its alloys have been used in biomedical applications because of their satisfactory mechanical properties, biocompatibility and corrosion resistance. Their high corrosion resistance has been attributed to the formation of a thermodynamically stable titanium oxide layer on the surface of these materials. In the present work, the corrosion behavior of Ti-9Mo (wt %) alloy, doped with oxygen, was evaluated in a phosphate buffered saline (PBS) solution. The results showed a small decrease in the corrosion potential and a reduction in the corrosion rate with the oxygen doping, indicating a higher corrosion resistance is desirable for biomedical applications.Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Universidade Estadual Paulista Laboratório de Anelasticidade e BiomateriaisUniversidade Estadual Paulista Laboratório de EletrocatáliseUniversidade Estadual Paulista Departamento de Materiais e TecnologiaUniversidade Estadual Paulista Laboratório de Anelasticidade e BiomateriaisUniversidade Estadual Paulista Laboratório de EletrocatáliseUniversidade Estadual Paulista Departamento de Materiais e Tecnologi

Stress Induced Ordering Due to Interstitial Elements in Nb and Ta by Frequency Analysis

It is well known that the interstitial elements present in solid solution in metals interact with the matrix by a relaxation process known as stress induced ordering. Traditionally this relaxation process is observed in the internal friction measurements. It is a common practice that researchers present the results of the frequency together with internal friction without giving any analysis. In this work we apply an expression which relates the variation of frequency with temperature and analyse the experimental results cited in the literature of the relaxation process due to the stress induced ordering of oxygen and nitrogen present in niobium and tantalum

Anelastic Spectroscopy In A Ti Alloy Used As Biomaterial

Ti and its alloys have been used thoroughly in the production of prostheses and dental implants due to their properties, such as high corrosion resistance, low elasticity modulus and high mechanical strength/density relation. Among the Ti-based alloys, the Ti-35Nb-7Zr-5Ta (TNZT) is one that presents the smallest elasticity modulus, making it an excellent alternative to be used as a biomaterial. In this paper, mechanical spectroscopy measurements were made in TNZT alloys containing several quantities of oxygen and nitrogen in solid solution. Mechanical spectroscopy measurements were made by using a torsion pendulum, operating at an oscillation frequency in the interval 4-30 Hz, temperature in the range 100-700 K, heating rate of about 1 K/min and vacuum lower than 10-5 Torr. Complex relaxation structures and a reduction in the elasticity modulus were observed for the heat-treated and doped samples. The observed peaks were associated with the interactions of interstitial atoms and the alloy elements. © 2009 Elsevier B.V. All rights reserved.521-5225962Wert, C.A., (1970) J. Phys. Chem. Solids, 31, pp. 1771-1783Wert, C.A., (1986) J. Appl. Phys., 60, pp. 1888-1895Berry, B.S., (1994) J. Phys. Chem. Solids, 55, pp. 1479-1483Cantelli, R., (2006) Mater. Sci. Eng. A, 442, pp. 5-20Weller, M., (2006) Mater. Sci. Eng. A, 442, pp. 21-30Blanter, M.S., Golovin, I.S., Neuhäuser, H., Sinning, H.-R., (2007) Internal Friction in Metallic Materials: A Handbook, Springer Series in Materials Science, 90. , Springer Berlin Heidelberg, Berlin, GermanySnoek, J.L., (1941) Physica, 8, pp. 711-733Nowick, A.S., Berry, B.S., (1972) Anelastic Relaxation in Crystalline Solids, , Academic Press, New York, USASchaller, R., Fantozzi, G., Gremaud, G., (2001) Mechanical Spectroscopy, , Trans Tech Publications, Stafa, Zurich. SwitzerlandBerry, B.S., (1962) Acta Metall., 10, pp. 271-280Ahmad, M.S., Szkopiak, Z.C., (1970) J. Phys. Chem. Solids, 31, pp. 1799-1804Cantelli, R., Szkopiak, Z.C., (1976) Appl. Phys., 9, pp. 153-160Weller, M., Li, G.Y., Zhang, J.X., Kê, T.S., Diehl, J., (1981) Acta Metall., 29, pp. 1047-1054Florêncio, O., Botta F, W.J., Grandini, C.R., Tejima, H., Jordão, J.A.R., (1994) J. Alloys Compd., 211-212, pp. 37-40Haneczok, G., (1998) Philos. Mag. A, 78, pp. 845-855Yu, L., Yin, F., Ping, D., (2007) Phys. Rev. B, 75, p. 174105Weller, M., Haneczok, G., Diehl, J., (1992) Phys. Stat. Sol. B, 172, pp. 145-159Haneczok, G., Weller, M., Diehl, J., (1992) Phys. Stat. Sol. B, 172, pp. 557-572Kushnareva, N.P., Snejko, S.E., (1994) J. Alloy Compd., 211-212, pp. 75-79Grandini, C.R., Ferreira, L.E.C., Sandim, H.R.Z., Florêncio, O., Tejima, H., Jordão, J.A.R., (1996) J. Phys. IV (Paris), 6 (C8), pp. 135-138Almeida, L.H., Niemeyer, T.C., Pires, K.C.C., Grandini, C.R., Pintão, C.A.F., Florêncio, O., (2004) Mater. Sci. Eng. A, 370, pp. 96-99Niemeyer, T.C., Grandini, C.R., Florêncio, O., (2005) Mater. Sci. Eng. A, 396, pp. 285-289Yu, L.M., Yin, F.X., (2007) J. Mater. Sci., 42, pp. 7826-7891Botta F, W.J., Florêncio, O., Grandini, C.R., Tejima, H., Jordão, J.A.R., (1990) Acta Metall. Mater., 38, pp. 391-396Souza, A.C., Grandini, C.R., Florêncio, O., (2008) J. Mater. Sci., 43, pp. 1593-1598Miura, R., Ota, K., Yoshimi, K., Hanada, S., (2003) Philos. Mag., 83, pp. 2343-2357Almeida, L.H., Grandini, C.R., Machado, J.P.B., Rodrigues Jr., D., (2005) Mater. Sci. Eng. A, 412, pp. 230-234Yin, F., Iwasaki, S., Ping, D., Nagai, K., (2006) Adv. Mater., 18, pp. 1541-1544Yin, F.X., Yu, L.M., Ping, D., (2007) Phys. Scr., T129, pp. 261-264Numakura, H., Yotsui, G., Koiwa, M., (1995) Acta Metall. Mater., 43, pp. 705-714Numakura, H., Koiwa, M., (1997) ASTM Standard Technical Publication 1304, pp. 383-393. , Wolfenden A., and Kira V.K. (Eds), American Society for Testing and Materials, West ConshohockenGrandini, C.R., (2002) Rev. Bras. Apl. Vácuo, 21, pp. 13-1

Internal Friction and Microstructure of Ti and Ti-Mo Alloys Containing Oxygen

Ti-Mo alloys are promising materials for use as biomaterials, because these alloys have excellent corrosion resistance and a good combination of mechanical properties such as fatigue, low elastic modulus, hardness, and wear resistance. The objective of this paper was to study the effect of heavy interstitial atoms on anelastic properties of Ti-Mo alloys using mechanical spectroscopy. The internal friction and Young’s modulus were measured as a function of temperature using dynamic mechanical analyser. The internal friction spectra were brought about by relaxation processes attributed to shortrange stress induced reorientation of interstitial and substitutional complexes in solid solution. It is suggested that the nature of the relaxing entities can be worked out in further research on Ti-Mo single crystals