Microstructural Considerations of a Multi-Pass Rolled Ti-Nb-Ta-Zr Alloy
The microstructural characteristic evolution was investigated during thermomechanical processing of Ti-29Nb-9Ta-10Zr (wt %) alloy, which consisted of, in a first stage, in a Multi-Pass Rolling with increasing thickness reduction of 20%, 40%, 60%, 80%, and 90%; in step two, the multi-pass rolled samp...
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MDPI AG
2023-04-01
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| Online Access: | https://www.mdpi.com/1996-1944/16/8/3208 |
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| author | Doina Răducanu Anna Nocivin Vasile Dănuț Cojocaru Nicolae Șerban Nicoleta Zărnescu-Ivan Raluca Elena Irimescu Bogdan Mihai Gălbinașu |
| author_facet | Doina Răducanu Anna Nocivin Vasile Dănuț Cojocaru Nicolae Șerban Nicoleta Zărnescu-Ivan Raluca Elena Irimescu Bogdan Mihai Gălbinașu |
| author_sort | Doina Răducanu |
| collection | DOAJ |
| description | The microstructural characteristic evolution was investigated during thermomechanical processing of Ti-29Nb-9Ta-10Zr (wt %) alloy, which consisted of, in a first stage, in a Multi-Pass Rolling with increasing thickness reduction of 20%, 40%, 60%, 80%, and 90%; in step two, the multi-pass rolled sample with the highest thickness reduction (90%) was subjected to a series of three variants of static short recrystallization and then to a final similar aging. The objective was to evaluate the microstructural features evolution during thermomechanical processing (phase’s nature, morphology, dimensions, and crystallographic characteristics) and to find the optimal heat treatment variant for refinement of the alloy granulation until ultrafine/nanometric level for a promising combination of mechanical properties. The microstructural features were investigated by X-ray diffraction and SEM techniques through which the presence of two phases was recorded: the β-Ti phase and the α″-Ti martensitic phase. The corresponding cell parameters, dimensions of the coherent crystallite and the micro-deformations at the crystalline network level for both recorded phases were determined. The majority β-Ti phase underwent a strong refinement during the Multi-Pass Rolling process until ultrafine/nano grain dimension (about 9.8 nm), with subsequent slow growing during recrystallization and aging treatments, hindered by the presence of sub-micron α″-Ti phase dispersed inside β-Ti grains. An analysis concerning the possible deformation mechanisms was performed. |
| first_indexed | 2024-03-11T04:47:35Z |
| format | Article |
| id | doaj.art-61ab0d0c948040ad8718f93d419d5fb0 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-11T04:47:35Z |
| publishDate | 2023-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-61ab0d0c948040ad8718f93d419d5fb02023-11-17T20:14:43ZengMDPI AGMaterials1996-19442023-04-01168320810.3390/ma16083208Microstructural Considerations of a Multi-Pass Rolled Ti-Nb-Ta-Zr AlloyDoina Răducanu0Anna Nocivin1Vasile Dănuț Cojocaru2Nicolae Șerban3Nicoleta Zărnescu-Ivan4Raluca Elena Irimescu5Bogdan Mihai Gălbinașu6Department of Metallic Materials Processing and Environmental Engineering, University Politehnica of Bucharest, 060042 Bucharest, RomaniaFaculty of Mechanical, Industrial and Maritime Engineering, Ovidius University of Constanta, 900527 Constanța, RomaniaDepartment of Metallic Materials Processing and Environmental Engineering, University Politehnica of Bucharest, 060042 Bucharest, RomaniaDepartment of Metallic Materials Processing and Environmental Engineering, University Politehnica of Bucharest, 060042 Bucharest, RomaniaDepartment of Metallic Materials Processing and Environmental Engineering, University Politehnica of Bucharest, 060042 Bucharest, RomaniaDepartment of Metallic Materials Processing and Environmental Engineering, University Politehnica of Bucharest, 060042 Bucharest, RomaniaDental Medicine Faculty, University of Medicine and Pharmacy “Carol Davila” Bucharest, 020021 Bucharest, RomaniaThe microstructural characteristic evolution was investigated during thermomechanical processing of Ti-29Nb-9Ta-10Zr (wt %) alloy, which consisted of, in a first stage, in a Multi-Pass Rolling with increasing thickness reduction of 20%, 40%, 60%, 80%, and 90%; in step two, the multi-pass rolled sample with the highest thickness reduction (90%) was subjected to a series of three variants of static short recrystallization and then to a final similar aging. The objective was to evaluate the microstructural features evolution during thermomechanical processing (phase’s nature, morphology, dimensions, and crystallographic characteristics) and to find the optimal heat treatment variant for refinement of the alloy granulation until ultrafine/nanometric level for a promising combination of mechanical properties. The microstructural features were investigated by X-ray diffraction and SEM techniques through which the presence of two phases was recorded: the β-Ti phase and the α″-Ti martensitic phase. The corresponding cell parameters, dimensions of the coherent crystallite and the micro-deformations at the crystalline network level for both recorded phases were determined. The majority β-Ti phase underwent a strong refinement during the Multi-Pass Rolling process until ultrafine/nano grain dimension (about 9.8 nm), with subsequent slow growing during recrystallization and aging treatments, hindered by the presence of sub-micron α″-Ti phase dispersed inside β-Ti grains. An analysis concerning the possible deformation mechanisms was performed.https://www.mdpi.com/1996-1944/16/8/3208beta-titanium alloysmulti-pass rollingrecrystallizationXRDSEM |
| spellingShingle | Doina Răducanu Anna Nocivin Vasile Dănuț Cojocaru Nicolae Șerban Nicoleta Zărnescu-Ivan Raluca Elena Irimescu Bogdan Mihai Gălbinașu Microstructural Considerations of a Multi-Pass Rolled Ti-Nb-Ta-Zr Alloy Materials beta-titanium alloys multi-pass rolling recrystallization XRD SEM |
| title | Microstructural Considerations of a Multi-Pass Rolled Ti-Nb-Ta-Zr Alloy |
| title_full | Microstructural Considerations of a Multi-Pass Rolled Ti-Nb-Ta-Zr Alloy |
| title_fullStr | Microstructural Considerations of a Multi-Pass Rolled Ti-Nb-Ta-Zr Alloy |
| title_full_unstemmed | Microstructural Considerations of a Multi-Pass Rolled Ti-Nb-Ta-Zr Alloy |
| title_short | Microstructural Considerations of a Multi-Pass Rolled Ti-Nb-Ta-Zr Alloy |
| title_sort | microstructural considerations of a multi pass rolled ti nb ta zr alloy |
| topic | beta-titanium alloys multi-pass rolling recrystallization XRD SEM |
| url | https://www.mdpi.com/1996-1944/16/8/3208 |
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