Origin of age softening in the refractory high-entropy alloys
Refractory high-entropy alloys (RHEAs) are emerging materials with potential for use under extreme conditions. As a newly developed material system, a comprehensive understanding of their long-term stability under potential service temperatures remains to be established. This study examined a titani...
| Main Authors: | , , , , , , , , , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
American Association for the Advancement of Science
2023
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| _version_ | 1797111800711348224 |
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| author | Liu, J Li, B-S Gardner, H Gong, Y Liu, F He, G Moorehead, M Parkin, C Couet, A Wilkinson, AJ Armstrong, DEJ |
| author_facet | Liu, J Li, B-S Gardner, H Gong, Y Liu, F He, G Moorehead, M Parkin, C Couet, A Wilkinson, AJ Armstrong, DEJ |
| author_sort | Liu, J |
| collection | OXFORD |
| description | Refractory high-entropy alloys (RHEAs) are emerging materials with potential for use under extreme conditions. As a newly developed material system, a comprehensive understanding of their long-term stability under potential service temperatures remains to be established. This study examined a titanium-vanadium-niobium-tantalum alloy, a promising RHEA known for its superior high-temperature strength and room-temperature ductility. Using a combination of advanced analytical microscopies, Calculation of Phase Diagrams (CALPHAD) software, and nanoindentation, we investigated the evolution of its microstructure and mechanical properties upon aging at 700°C. Trace interstitials such as oxygen and nitrogen, initially contributing to solid solution strengthening, promote phase segregation during thermal aging. As a result of the depletion of solute interstitials within the metal matrix, a progressive softening is observed in the alloy as a function of aging time. This study, therefore, underscores the need for a better control of impurities in future development and application of RHEAs. |
| first_indexed | 2024-03-07T08:15:29Z |
| format | Journal article |
| id | oxford-uuid:50d44586-28a9-4fd4-b81a-160493b5e728 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T08:15:29Z |
| publishDate | 2023 |
| publisher | American Association for the Advancement of Science |
| record_format | dspace |
| spelling | oxford-uuid:50d44586-28a9-4fd4-b81a-160493b5e7282023-12-20T13:17:31ZOrigin of age softening in the refractory high-entropy alloysJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:50d44586-28a9-4fd4-b81a-160493b5e728EnglishSymplectic ElementsAmerican Association for the Advancement of Science2023Liu, JLi, B-SGardner, HGong, YLiu, FHe, GMoorehead, MParkin, CCouet, AWilkinson, AJArmstrong, DEJRefractory high-entropy alloys (RHEAs) are emerging materials with potential for use under extreme conditions. As a newly developed material system, a comprehensive understanding of their long-term stability under potential service temperatures remains to be established. This study examined a titanium-vanadium-niobium-tantalum alloy, a promising RHEA known for its superior high-temperature strength and room-temperature ductility. Using a combination of advanced analytical microscopies, Calculation of Phase Diagrams (CALPHAD) software, and nanoindentation, we investigated the evolution of its microstructure and mechanical properties upon aging at 700°C. Trace interstitials such as oxygen and nitrogen, initially contributing to solid solution strengthening, promote phase segregation during thermal aging. As a result of the depletion of solute interstitials within the metal matrix, a progressive softening is observed in the alloy as a function of aging time. This study, therefore, underscores the need for a better control of impurities in future development and application of RHEAs. |
| spellingShingle | Liu, J Li, B-S Gardner, H Gong, Y Liu, F He, G Moorehead, M Parkin, C Couet, A Wilkinson, AJ Armstrong, DEJ Origin of age softening in the refractory high-entropy alloys |
| title | Origin of age softening in the refractory high-entropy alloys |
| title_full | Origin of age softening in the refractory high-entropy alloys |
| title_fullStr | Origin of age softening in the refractory high-entropy alloys |
| title_full_unstemmed | Origin of age softening in the refractory high-entropy alloys |
| title_short | Origin of age softening in the refractory high-entropy alloys |
| title_sort | origin of age softening in the refractory high entropy alloys |
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