Mechanical behavior and corrosion properties of Ti-7Mo-8Nb alloy for biomedical applications
The present study investigates the microstructural, mechanical and corrosion properties of Ti-7Mo-8Nb alloy manufactured through powder metallurgy. The performance of the developed alloy is benchmarked against cast Ti-6Al-4V. Microstructure examination of Ti-7Mo-8Nb revealed a Widmanstätten structur...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2021-01-01
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| Series: | Materials Research Express |
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| Online Access: | https://doi.org/10.1088/2053-1591/ac2346 |
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| author | Modar Saood Khaled M Ibrahim Emad El-kashif Madiha Shoeib Abobakr Elshalakany Mamdouh S Mohamed |
| author_facet | Modar Saood Khaled M Ibrahim Emad El-kashif Madiha Shoeib Abobakr Elshalakany Mamdouh S Mohamed |
| author_sort | Modar Saood |
| collection | DOAJ |
| description | The present study investigates the microstructural, mechanical and corrosion properties of Ti-7Mo-8Nb alloy manufactured through powder metallurgy. The performance of the developed alloy is benchmarked against cast Ti-6Al-4V. Microstructure examination of Ti-7Mo-8Nb revealed a Widmanstätten structure containing equiaxed β grains along with acicular α phase. In regards to the mechanical properties, Ti-7Mo-8Nb possessed higher compressive yield strength, higher hardness but lower elastic modulus than Ti-6Al-4V. The elastic modulus of Ti-7Mo-8Nb was almost 44.9 GPa, approaching the usually desired value of 30 GPa for cortical bone. Wear test revealed also a lower wear rate for Ti-7Mo-8Nb. Potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) experiments were carried out for both Ti-7Mo-8Nb and Ti-6Al-4V immersed in Hank’s solution as a simulated body fluid at a temperature of 37 °C. Both experiments revealed higher corrosion resistance for Ti-7Mo-8Nb manifested by lower corrosion and passivation current densities, higher negative phase angle, higher impedance modulus and larger Nyquist semicircle diameter as compared to Ti-6Al-4V alloy. The superior corrosion properties of Ti-7Mo-8Nb are indicative of the development of a more stable passive layer on the surface. The fitting of EIS data into an equivalent circuit suggested the formation of a double oxide layer consisting of an inner compact base passive film along with an external porous layer. The presented combination of high strength, high corrosion resistance along with low elastic modulus puts forward the Ti-7Mo-8Nb alloy as a good candidate for orthopedic biomedical applications. |
| first_indexed | 2024-03-12T15:42:15Z |
| format | Article |
| id | doaj.art-8b5b2178784c4e1ea9ab9332834a4a90 |
| institution | Directory Open Access Journal |
| issn | 2053-1591 |
| language | English |
| last_indexed | 2024-03-12T15:42:15Z |
| publishDate | 2021-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | Materials Research Express |
| spelling | doaj.art-8b5b2178784c4e1ea9ab9332834a4a902023-08-09T15:54:52ZengIOP PublishingMaterials Research Express2053-15912021-01-018909540110.1088/2053-1591/ac2346Mechanical behavior and corrosion properties of Ti-7Mo-8Nb alloy for biomedical applicationsModar Saood0Khaled M Ibrahim1Emad El-kashif2Madiha Shoeib3Abobakr Elshalakany4Mamdouh S Mohamed5https://orcid.org/0000-0003-0610-636XDepartment of Mechanical Design and Production, Faculty of Engineering, Cairo University , Giza 12613, EgyptCentral Metallurgical R&D Institute, Helwan, Cairo, EgyptDepartment of Mechanical Design and Production, Faculty of Engineering, Cairo University , Giza 12613, EgyptCentral Metallurgical R&D Institute, Helwan, Cairo, EgyptProduction Engineering and Printing Technology Department, Akhbar El Yom Academy, Giza, EgyptDepartment of Mechanical Design and Production, Faculty of Engineering, Cairo University , Giza 12613, EgyptThe present study investigates the microstructural, mechanical and corrosion properties of Ti-7Mo-8Nb alloy manufactured through powder metallurgy. The performance of the developed alloy is benchmarked against cast Ti-6Al-4V. Microstructure examination of Ti-7Mo-8Nb revealed a Widmanstätten structure containing equiaxed β grains along with acicular α phase. In regards to the mechanical properties, Ti-7Mo-8Nb possessed higher compressive yield strength, higher hardness but lower elastic modulus than Ti-6Al-4V. The elastic modulus of Ti-7Mo-8Nb was almost 44.9 GPa, approaching the usually desired value of 30 GPa for cortical bone. Wear test revealed also a lower wear rate for Ti-7Mo-8Nb. Potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) experiments were carried out for both Ti-7Mo-8Nb and Ti-6Al-4V immersed in Hank’s solution as a simulated body fluid at a temperature of 37 °C. Both experiments revealed higher corrosion resistance for Ti-7Mo-8Nb manifested by lower corrosion and passivation current densities, higher negative phase angle, higher impedance modulus and larger Nyquist semicircle diameter as compared to Ti-6Al-4V alloy. The superior corrosion properties of Ti-7Mo-8Nb are indicative of the development of a more stable passive layer on the surface. The fitting of EIS data into an equivalent circuit suggested the formation of a double oxide layer consisting of an inner compact base passive film along with an external porous layer. The presented combination of high strength, high corrosion resistance along with low elastic modulus puts forward the Ti-7Mo-8Nb alloy as a good candidate for orthopedic biomedical applications.https://doi.org/10.1088/2053-1591/ac2346Ti-7Mo-8Nbcorrosiontitaniumbiomaterial |
| spellingShingle | Modar Saood Khaled M Ibrahim Emad El-kashif Madiha Shoeib Abobakr Elshalakany Mamdouh S Mohamed Mechanical behavior and corrosion properties of Ti-7Mo-8Nb alloy for biomedical applications Materials Research Express Ti-7Mo-8Nb corrosion titanium biomaterial |
| title | Mechanical behavior and corrosion properties of Ti-7Mo-8Nb alloy for biomedical applications |
| title_full | Mechanical behavior and corrosion properties of Ti-7Mo-8Nb alloy for biomedical applications |
| title_fullStr | Mechanical behavior and corrosion properties of Ti-7Mo-8Nb alloy for biomedical applications |
| title_full_unstemmed | Mechanical behavior and corrosion properties of Ti-7Mo-8Nb alloy for biomedical applications |
| title_short | Mechanical behavior and corrosion properties of Ti-7Mo-8Nb alloy for biomedical applications |
| title_sort | mechanical behavior and corrosion properties of ti 7mo 8nb alloy for biomedical applications |
| topic | Ti-7Mo-8Nb corrosion titanium biomaterial |
| url | https://doi.org/10.1088/2053-1591/ac2346 |
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