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Effect of the substitutional zirconium on selected mechanical properties of Ti-10Mo-based alloy, for biomedical applications

2016; Frontiers Media; Volume: 4; Linguagem: Inglês

10.3389/conf.fbioe.2016.01.00660

2296-4185

Ara�jo Raul, Su�rez Gabiela, Buzalaf Mar�lia, Grandini Carlos,

Bone Tissue Engineering Materials

Event Abstract Back to Event Effect of the substitutional zirconium on selected mechanical properties of Ti-10Mo-based alloy, for biomedical applications Raul O. Araújo1, 2, Gabiela P. Suárez1, 2, Marília A. Buzalaf3 and Carlos R. Grandini1, 2 1 UNESP – Univ Estadual Paulista, Laboratório de Anelasticidade e Biomateriais, Brazil 2 IBTN – Institute of Biomaterials, Tribocorrosion and Nanomedicine – Brazilian Branch, Brazil 3 USP - Universidade de São Paulo, Faculdade de Odontologia de Bauru, Brazil Ti-10Mo has been quite studied in relation their microstructure and mechanical properties. It alloy has predominately body-centered cubic crystalline (β phase), but other secondary phases may occur, like as α and α’’[1]-[3]. It has knew that zirconium is a neutral element when added in pure titanium but when zirconium is restrained as substitutional element in alloys with beta phase stabilizers elements, it can assist the stabilization of that phase. In this work, it was verified the effect of zirconium in Ti-10Mo-xZr alloys (x = 5, 10, 15, 20 wt%) on Vickers microhardness and elastic modulus. The alloys were melted by arc-furnace with non-consumable tungsten electrodes and water-cooled copper crucible, in argon atmosphere to avoid sample contamination. After, the produced alloys were submitted to homogeneity heat treatment (for 86400 s and 1273 K), in a vacuum of 10-6 Torr, with slow cooling. Subsequently, hot rolling was performed at 1273 K, followed by air cooling. The alloys were characterized by chemical analysis, structural, microstructural, mechanical properties and biocompatibility tests. The chemical analysis was determined by energy dispersive x-ray (EDX) and density. The structure and microstructure of the alloys were evaluated by x-ray diffraction (XRD), optical and scanning electronic microscopic. The mechanical properties were evaluated by Vickers microhardnessand for the elastic modulus, the impulse excitation method was used. The results of chemical composition showed that stoichiometry of the produced alloys were obtained satisfactorily with relation the nominal composition. The structure and microstructure of the alloys have predominance of β phase with the presence of small amount of α phase, as can be observed in Fig. 1. The addition of zirconium helped stabilize the β phase[4]. Figure 1: X-ray diffraction (a) and SEM – EBSD (b), for the Ti-10Mo alloys after the homogeneity heat treatment. The Vickers microhardness obtained for these alloys present solid solution hardening and phase precipitation hardening, suffering influence of processing, as can observed in part (a) of Fig. 2[2][5]. The obtained values for elastic modulus showed that the alloys suffered strong influence of the addition of substitutional elements, as can observed in part (b) of Fig. 2. The alloys with 5 and 10 wt% percent have elastic modulus closer to Ti-10Mo (95 GPa), verifying that the zirconium decrease significantly the elastic modulus of the alloys from 102 GPa (Ti-10Mo-5Zr) to 78 GPa (Ti-10Mo-20Zr). Figure 2: Microhardness after homogeneity heat treatment (a) and Elastic modulus after hot rolling (b), for Ti-10Mo-Zr alloys. The results of cytotoxicity tests showed that alloys have no cytotoxicity effects, as can be observed in Fig. 3. Figure 3: Cytotoxicity tests for Ti-10Mo-Zr alloy. CNPq (grants #481.313/2012-5 and #307.279/2013-8); FAPESP (grants #2013/09.063-5 and #2015/08.462-9)References:[1] MARTINS JÚNIOR, J. R. S. et al. Preparation and characterization of Ti-15Mo alloy used as biomaterial. Materials Research, v. 14, n. 1, p. 107-112, 2011.[2] CORREA, D. R. N.; KURODA, P. A. B.; GRANDINI, C. R. Structure, Microstructure, and Selected Mechanical Properties of Ti-Zr-Mo Alloys for Biomedical Applications. Advanced Materials Research, v. 922, p. 75-80, 2014.[3] ZHANG, W.-D. et al. Elastic modulus of phases in Ti–Mo alloys. Materials Characterization, v. 106, p. 302-307, 2015.[4] HO, W.-F. et al. Effects of molybdenum content on the structure and mechanical properties of as-cast Ti–10Zr-based alloys for biomedical applications. Materials Science and Engineering: C, v. 32, n. 3, p. 517-522, 2012.[5] CORREA, D. R. N. et al. Effect of the substitutional elements on the microstructure of the Ti-15Mo-Zr and Ti-15Zr-Mo systems alloys. Journal of Materials Research and Technology, v. 4, n. 2, p. 180-185, 2015. Keywords: biomaterial, microstructure, biomedical application, mechanical property Conference: 10th World Biomaterials Congress, Montréal, Canada, 17 May - 22 May, 2016. Presentation Type: Poster Topic: Biomaterials in musculoskeletal orthopeadics and tissues Citation: Araújo RO, Suárez GP, Buzalaf MA and Grandini CR (2016). Effect of the substitutional zirconium on selected mechanical properties of Ti-10Mo-based alloy, for biomedical applications. Front. Bioeng. Biotechnol. Conference Abstract: 10th World Biomaterials Congress. doi: 10.3389/conf.FBIOE.2016.01.00660 Copyright: The abstracts in this collection have not been subject to any Frontiers peer review or checks, and are not endorsed by Frontiers. They are made available through the Frontiers publishing platform as a service to conference organizers and presenters. The copyright in the individual abstracts is owned by the author of each abstract or his/her employer unless otherwise stated. Each abstract, as well as the collection of abstracts, are published under a Creative Commons CC-BY 4.0 (attribution) licence (https://creativecommons.org/licenses/by/4.0/) and may thus be reproduced, translated, adapted and be the subject of derivative works provided the authors and Frontiers are attributed. For Frontiers’ terms and conditions please see https://www.frontiersin.org/legal/terms-and-conditions. Received: 27 Mar 2016; Published Online: 30 Mar 2016. Login Required This action requires you to be registered with Frontiers and logged in. To register or login click here. Abstract Info Abstract The Authors in Frontiers Raul O Araújo Gabiela P Suárez Marília A Buzalaf Carlos R Grandini Google Raul O Araújo Gabiela P Suárez Marília A Buzalaf Carlos R Grandini Google Scholar Raul O Araújo Gabiela P Suárez Marília A Buzalaf Carlos R Grandini PubMed Raul O Araújo Gabiela P Suárez Marília A Buzalaf Carlos R Grandini Related Article in Frontiers Google Scholar PubMed Abstract Close Back to top Javascript is disabled. Please enable Javascript in your browser settings in order to see all the content on this page.