Microstructure and Mechanical Properties of Biomedical Ti-Zr-Nb-Ta-Sn High-Entropy Alloys
Ti(50-x)Zr38NbxTa8Sn4 high-entropy alloys with x = 0, 10, and 20 at.% were produced by vacuum arc melting in a high-purity argon atmosphere. The initial microstructures consisted of equiaxial bcc grains with sizes of 115 ± 30 µm, 250 ± 60 µm, and 280 ± 70 µm for the Ti30Nb20, Ti40Nb10, and Ti50Nb0 a...
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MDPI AG
2023-02-01
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| author | Maxim Ozerov Nikita Yurchenko Vitaly Sokolovsky Elena Nozdracheva Evgeniya Panina Sergey Nadezhdin Nikita Stepanov Sergey Zherebtsov |
| author_facet | Maxim Ozerov Nikita Yurchenko Vitaly Sokolovsky Elena Nozdracheva Evgeniya Panina Sergey Nadezhdin Nikita Stepanov Sergey Zherebtsov |
| author_sort | Maxim Ozerov |
| collection | DOAJ |
| description | Ti(50-x)Zr38NbxTa8Sn4 high-entropy alloys with x = 0, 10, and 20 at.% were produced by vacuum arc melting in a high-purity argon atmosphere. The initial microstructures consisted of equiaxial bcc grains with sizes of 115 ± 30 µm, 250 ± 60 µm, and 280 ± 70 µm for the Ti30Nb20, Ti40Nb10, and Ti50Nb0 alloys, respectively. The Ti30Nb20 and Ti40Nb10 alloys showed untypical mechanical behavior with a short strain-hardening stage followed by a gradual decrease in flow stress after reaching the yield point. Although these two alloys had some inclination toward macroscopic strain localization, their tensile elongation was similar to that obtained in the Ti50Nb0 alloy, which had a more extended stage of uniform deformation. The differences were associated with distinct microstructures observed after deformation to fracture. The formation of dislocation bands and the activation of cross-slip at the microscale, as well as the appearance of kink bands at the mesoscale, can result in plastic instability. In contrast, a lamellar-like microstructure with parallel dislocation bands, such as the one observed in the Ti50Nb0 alloy, can ensure a more stable mechanical behavior. The developed alloys (Ti30Nb20 and Ti40Nb10) have properties that make them highly attractive for biomedical application due to a combination of very high yield strengths (1090 and 930 MPa, respectively), low Young’s moduli (~78 and ~69 GPa, respectively), reasonable ductility, and excellent biocompatibility. |
| first_indexed | 2024-03-11T08:25:06Z |
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| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-11T08:25:06Z |
| publishDate | 2023-02-01 |
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| series | Metals |
| spelling | doaj.art-57f9acd848854aa698ea223198a0c36c2023-11-16T22:08:08ZengMDPI AGMetals2075-47012023-02-0113235310.3390/met13020353Microstructure and Mechanical Properties of Biomedical Ti-Zr-Nb-Ta-Sn High-Entropy AlloysMaxim Ozerov0Nikita Yurchenko1Vitaly Sokolovsky2Elena Nozdracheva3Evgeniya Panina4Sergey Nadezhdin5Nikita Stepanov6Sergey Zherebtsov7Laboratory of Bulk Nanostructured Materials, Belgorod State University, 308015 Belgorod, RussiaLaboratory of Bulk Nanostructured Materials, Belgorod State University, 308015 Belgorod, RussiaLaboratory of Bulk Nanostructured Materials, Belgorod State University, 308015 Belgorod, RussiaLaboratory of Bulk Nanostructured Materials, Belgorod State University, 308015 Belgorod, RussiaLaboratory of Bulk Nanostructured Materials, Belgorod State University, 308015 Belgorod, RussiaLaboratory of Bulk Nanostructured Materials, Belgorod State University, 308015 Belgorod, RussiaLaboratory of Bulk Nanostructured Materials, Belgorod State University, 308015 Belgorod, RussiaLaboratory of Bulk Nanostructured Materials, Belgorod State University, 308015 Belgorod, RussiaTi(50-x)Zr38NbxTa8Sn4 high-entropy alloys with x = 0, 10, and 20 at.% were produced by vacuum arc melting in a high-purity argon atmosphere. The initial microstructures consisted of equiaxial bcc grains with sizes of 115 ± 30 µm, 250 ± 60 µm, and 280 ± 70 µm for the Ti30Nb20, Ti40Nb10, and Ti50Nb0 alloys, respectively. The Ti30Nb20 and Ti40Nb10 alloys showed untypical mechanical behavior with a short strain-hardening stage followed by a gradual decrease in flow stress after reaching the yield point. Although these two alloys had some inclination toward macroscopic strain localization, their tensile elongation was similar to that obtained in the Ti50Nb0 alloy, which had a more extended stage of uniform deformation. The differences were associated with distinct microstructures observed after deformation to fracture. The formation of dislocation bands and the activation of cross-slip at the microscale, as well as the appearance of kink bands at the mesoscale, can result in plastic instability. In contrast, a lamellar-like microstructure with parallel dislocation bands, such as the one observed in the Ti50Nb0 alloy, can ensure a more stable mechanical behavior. The developed alloys (Ti30Nb20 and Ti40Nb10) have properties that make them highly attractive for biomedical application due to a combination of very high yield strengths (1090 and 930 MPa, respectively), low Young’s moduli (~78 and ~69 GPa, respectively), reasonable ductility, and excellent biocompatibility.https://www.mdpi.com/2075-4701/13/2/353high-entropy alloysmicrostructureEBSD analysismechanical propertiesbiomedical application |
| spellingShingle | Maxim Ozerov Nikita Yurchenko Vitaly Sokolovsky Elena Nozdracheva Evgeniya Panina Sergey Nadezhdin Nikita Stepanov Sergey Zherebtsov Microstructure and Mechanical Properties of Biomedical Ti-Zr-Nb-Ta-Sn High-Entropy Alloys Metals high-entropy alloys microstructure EBSD analysis mechanical properties biomedical application |
| title | Microstructure and Mechanical Properties of Biomedical Ti-Zr-Nb-Ta-Sn High-Entropy Alloys |
| title_full | Microstructure and Mechanical Properties of Biomedical Ti-Zr-Nb-Ta-Sn High-Entropy Alloys |
| title_fullStr | Microstructure and Mechanical Properties of Biomedical Ti-Zr-Nb-Ta-Sn High-Entropy Alloys |
| title_full_unstemmed | Microstructure and Mechanical Properties of Biomedical Ti-Zr-Nb-Ta-Sn High-Entropy Alloys |
| title_short | Microstructure and Mechanical Properties of Biomedical Ti-Zr-Nb-Ta-Sn High-Entropy Alloys |
| title_sort | microstructure and mechanical properties of biomedical ti zr nb ta sn high entropy alloys |
| topic | high-entropy alloys microstructure EBSD analysis mechanical properties biomedical application |
| url | https://www.mdpi.com/2075-4701/13/2/353 |
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