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Title: | Selective Laser Melting of High-strength, Low-modulus Ti–35Nb–7Zr–5Ta Alloy |
Authors: | Ummethala, R. Karamched, P. S. Rathinavelu, S. Singh, N. Aggarwal, A. Sun, K. Ivanov, E. Kollo, L. Okulov, I. Eckert, J. Prashanth, K. G. |
Issue Date: | 2020 |
Publisher: | Elsevier B.V. Elsevier BV |
Citation: | Selective Laser Melting of High-strength, Low-modulus Ti–35Nb–7Zr–5Ta Alloy / R. Ummethala, P. S. Karamched, S. Rathinavelu et al. — DOI 10.2495/EPM200031 // Materialia. — 2020. — Vol. 14. — 100941. |
Abstract: | The state-of-the-art alloys for load-bearing implant applications lack the necessary functional attributes and are largely a compromise between biocompatibility and mechanical properties. While commercial alloys pose long-term toxicity and detrimental stress shielding effects, the newly developed alloys are closing in on the gaps, however, falling short of the desired elastic modulus necessary to rule out stress shielding. In this work, we report the fabrication of a low modulus β-Ti alloy, Ti–35Nb–7Zr–5Ta (TNZT), by selective laser melting (SLM) with optimized laser parameters. The as-prepared SLM TNZT shows a high ultimate tensile strength (~630 MPa), excellent ductility (~15%) and a lower elastic modulus (~81 GPa) when compared to the state-of-the-art cp-Ti and Ti-based alloys. The mechanical performance of the as-printed TNZT alloy has been examined and is correlated to the microstructure (grain structure, phase constitution and dislocation density). It is proposed that a high density of GND (geometrically necessary dislocations), resulting from rapid cooling, in the as-prepared condition strengthens the alloy, whereas the single phase β-bcc crystal structure results in lowering the elastic modulus. High grain boundary area and a preferred crystal orientation of {200} planes within the bcc crystal lattices contribute to an additional drop in the elastic modulus of the alloy. It is shown that the TNZT alloy, processed by SLM, demonstrates the best combination of strength and modulus, illustrating its potential as a promising biomaterial of the future. © 2020. |
Keywords: | BIOMATERIALS ELASTIC MODULUS MICROSTRUCTURE EVOLUTION SELECTIVE LASER MELTING TI–35NB–7ZR–5TA BIOCOMPATIBILITY CRYSTAL ORIENTATION ELASTIC MODULI GRAIN BOUNDARIES HIGH STRENGTH ALLOYS MELTING SELECTIVE LASER MELTING SHIELDING TENSILE STRENGTH TITANIUM METALLOGRAPHY COMMERCIAL ALLOYS DISLOCATION DENSITIES FUNCTIONAL ATTRIBUTE GEOMETRICALLY NECESSARY DISLOCATIONS MECHANICAL PERFORMANCE PHASE CONSTITUTION SELECTIVE LASER MELTING (SLM) ULTIMATE TENSILE STRENGTH TITANIUM ALLOYS |
URI: | http://elar.urfu.ru/handle/10995/111379 |
Access: | info:eu-repo/semantics/openAccess |
SCOPUS ID: | 85094315675 |
PURE ID: | 20119112 |
ISSN: | 2589-1529 |
DOI: | 10.2495/EPM200031 |
metadata.dc.description.sponsorship: | This work was supported by the European Regional Development Fund (ASTRA6-6, ASTRA35-6 and MOBERC15). The authors would like to thank Dr. Vitali Podgurski, Mr. Andrei Bogatov, Mr. Asad Alamgir Shaikh, Dr. Mart Viljus, Dr. Märt Kolnes, Mr. Rainer Traksmaa, Mr. Endel Esinurm and Ms. Laivi Väljaots for extending research facilities and helping to improve the research outcome with stimulating discussions. |
Appears in Collections: | Научные публикации ученых УрФУ, проиндексированные в SCOPUS и WoS CC |
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