The effect of boron addition on microstructure and mechanical properties of biomedical Ti35Nb6Ta alloy |
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| Affiliation: | 1. UJP PRAHA a.s., Nad Kamínkou 1345, 156 10 Prague, Zbraslav, Czech Republic;2. CTU in Prague, Faculty of Mechanical Engineering, Department of Materials Engineering, Karlovo Namesti 13, 121 35 Praha 2, Czech Republic;3. Charles University, Faculty of Mathematics and Physics, Ke Karlovu 5, 121 16 Prague 2, Czech Republic;4. Masaryk University, Faculty of Medicine, Department of Stomathology, Komenského Náměstí 220/2, 662 43 Brno, Czech Republic;5. Faculty of Mechanical Engineering, University of West Bohemia, Univerzitní 22, 306 14 Plzeň, Czech Republic;1. Centro Atómico Bariloche, Comisión Nacional de Energía Atómica, 8400 S.C. de Bariloche, Argentina;2. Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina;3. EMAT, University of Antwerp, Belgium;1. CSIR — National Laser Center, Pretoria, South Africa;2. Department of Mechanical Engineering, Cape Peninsula University of Technology, Cape Town, South Africa;3. Applied Mathematics Division, Department of Mathematical Sciences, Stellenbosch University, Stellenbosch, South Africa;4. Department of Mechanical Engineering, Nelson Mandela Metropolitan University, Port Elizabeth, South Africa;1. Department of Materials Engineering, Federal University of São Carlos, UFSCar, 13565-905 São Carlos, SP, Brazil;2. Department of Manufacturing and Materials Engineering, University of Campinas, UNICAMP, PO Box 6122, 13083-970 Campinas, SP, Brazil |
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| Abstract: | The beta-titanium alloys are promising materials for bioapplications but their processing via melting is difficult. Coarse grains have been observed in as-cast specimens. Subsequent thermo-mechanical processing seems to be necessary in order to obtain fine-grained microstructure with better mechanical properties. The grain size can be decreased significantly by addition of small boron amount. In this work Ti–35Nb–6Ta alloy with various B additions (0, 0.05, 0.1, 0.3 and 0.5 wt.%) has been studied. Even the smallest amount of B leads to significant grain refinement in Ti–35Nb–6Ta alloy (from 1300 to about 350 μm). Slight grain refinement has been observed also after hot forging and solution treatment. TiB particles emerged in specimens due to B addition. These particles contribute to changes in mechanical properties not only in hot forged and solution treated specimens (hardness increase from 140 to 180 HV10), but also in cold swaged specimens (hardness from 230 to 250 HV10, tensile strength from 800 to 920 MPa). The hardness values can be increased up to 370 HV10 during aging at 400 °C (specimen with 0.5 wt.% B). It has been observed that specimens with low boron addition 0.05 wt.% possess no cytotoxicity. On the other hand in specimens with 0.1 wt.% B or more slight adverse effect on cytotoxicity has been observed. |
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