Oxidation behaviour of Ti-V-Cr-Nb-Ta and Al-Ti-V-Cr-Ta refractory high entropy alloys: Effects of Nb and Al substitutions
Refractory high entropy alloys (RHEAs) are candidate materials for nuclear and other high-temperature applications, due to their high-temperature strength, good irradiation resistance, and high melting temperatures. However, a significant issue with current RHEAs is that those exhibiting good mechan...
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Elsevier
2024-10-01
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| Series: | Materials & Design |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0264127524007457 |
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| author | Kieran Rivers Bradley Young Yuanbo T. Tang Bo-Shiuan Li Angus J. Wilkinson David E.J. Armstrong Junliang Liu |
| author_facet | Kieran Rivers Bradley Young Yuanbo T. Tang Bo-Shiuan Li Angus J. Wilkinson David E.J. Armstrong Junliang Liu |
| author_sort | Kieran Rivers |
| collection | DOAJ |
| description | Refractory high entropy alloys (RHEAs) are candidate materials for nuclear and other high-temperature applications, due to their high-temperature strength, good irradiation resistance, and high melting temperatures. However, a significant issue with current RHEAs is that those exhibiting good mechanical properties tend to show poor oxidation resistance, and vice versa. In this paper, the oxidation kinetics of four RHEAs (20Ti-20V-20Cr-20Nb-20Ta, 25Ti-25V-5Cr-20Nb-25Ta, 20Al-20Ti-20V-20Cr-20Ta, and 14Al-24Ti-24V-14Cr-24Ta alloys) were investigated in an air atmosphere at 1000 °C. As-prepared and oxidised samples were characterised by a combination of state-of-the-art microscopy techniques. By replacing Nb with Al, the two Al-containing alloys were observed to form a less porous oxide microstructure, showing significant improvement in their oxidation resistance. As a result of oxygen/nitrogen ingress during oxidation and associated phase-segregation at high temperatures, the hardness of the underlying metal matrix of the RHEAs increased by approximately 5 GPa. |
| format | Article |
| id | doaj-art-d64d9bed4db74a39b20f46260b21fb4c |
| institution | OA Journals |
| issn | 0264-1275 |
| language | English |
| publishDate | 2024-10-01 |
| publisher | Elsevier |
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| series | Materials & Design |
| spelling | doaj-art-d64d9bed4db74a39b20f46260b21fb4c2025-08-20T01:54:15ZengElsevierMaterials & Design0264-12752024-10-0124611337010.1016/j.matdes.2024.113370Oxidation behaviour of Ti-V-Cr-Nb-Ta and Al-Ti-V-Cr-Ta refractory high entropy alloys: Effects of Nb and Al substitutionsKieran Rivers0Bradley Young1Yuanbo T. Tang2Bo-Shiuan Li3Angus J. Wilkinson4David E.J. Armstrong5Junliang Liu6Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, UKDepartment of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, UKDepartment of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, UK; School of Metallurgy and Materials, University of Birmingham, Birmingham B15 2TT, UKDepartment of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, UK; Department of Mechanical and Electromechanical Engineering, National Sun-Yat Sen University, No. 70 Lien-hai Rd., Kaohsiung, TaiwanDepartment of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, UKDepartment of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, UKDepartment of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, UK; Department of Nuclear Engineering and Engineering Physics, University of Wisconsin-Madison, 1500 Engineering Drive, Madison, WI 53706, USA; Corresponding author.Refractory high entropy alloys (RHEAs) are candidate materials for nuclear and other high-temperature applications, due to their high-temperature strength, good irradiation resistance, and high melting temperatures. However, a significant issue with current RHEAs is that those exhibiting good mechanical properties tend to show poor oxidation resistance, and vice versa. In this paper, the oxidation kinetics of four RHEAs (20Ti-20V-20Cr-20Nb-20Ta, 25Ti-25V-5Cr-20Nb-25Ta, 20Al-20Ti-20V-20Cr-20Ta, and 14Al-24Ti-24V-14Cr-24Ta alloys) were investigated in an air atmosphere at 1000 °C. As-prepared and oxidised samples were characterised by a combination of state-of-the-art microscopy techniques. By replacing Nb with Al, the two Al-containing alloys were observed to form a less porous oxide microstructure, showing significant improvement in their oxidation resistance. As a result of oxygen/nitrogen ingress during oxidation and associated phase-segregation at high temperatures, the hardness of the underlying metal matrix of the RHEAs increased by approximately 5 GPa.http://www.sciencedirect.com/science/article/pii/S0264127524007457High Entropy AlloysOxidationTGAEBSDNanoindentation |
| spellingShingle | Kieran Rivers Bradley Young Yuanbo T. Tang Bo-Shiuan Li Angus J. Wilkinson David E.J. Armstrong Junliang Liu Oxidation behaviour of Ti-V-Cr-Nb-Ta and Al-Ti-V-Cr-Ta refractory high entropy alloys: Effects of Nb and Al substitutions Materials & Design High Entropy Alloys Oxidation TGA EBSD Nanoindentation |
| title | Oxidation behaviour of Ti-V-Cr-Nb-Ta and Al-Ti-V-Cr-Ta refractory high entropy alloys: Effects of Nb and Al substitutions |
| title_full | Oxidation behaviour of Ti-V-Cr-Nb-Ta and Al-Ti-V-Cr-Ta refractory high entropy alloys: Effects of Nb and Al substitutions |
| title_fullStr | Oxidation behaviour of Ti-V-Cr-Nb-Ta and Al-Ti-V-Cr-Ta refractory high entropy alloys: Effects of Nb and Al substitutions |
| title_full_unstemmed | Oxidation behaviour of Ti-V-Cr-Nb-Ta and Al-Ti-V-Cr-Ta refractory high entropy alloys: Effects of Nb and Al substitutions |
| title_short | Oxidation behaviour of Ti-V-Cr-Nb-Ta and Al-Ti-V-Cr-Ta refractory high entropy alloys: Effects of Nb and Al substitutions |
| title_sort | oxidation behaviour of ti v cr nb ta and al ti v cr ta refractory high entropy alloys effects of nb and al substitutions |
| topic | High Entropy Alloys Oxidation TGA EBSD Nanoindentation |
| url | http://www.sciencedirect.com/science/article/pii/S0264127524007457 |
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