Design of oxygen-doped TiZrHfNbTa refractory high entropy alloys with enhanced strength and ductility
Refractory high entropy alloys (RHEAs) are considered promising materials for high-temperature applications due to their thermal stability and high-temperature mechanical properties. However, most RHEAs have high density (>10 g/cm3) and exhibit limited ductility at low temperatures and softening...
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| Format: | Article |
| Language: | English |
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Elsevier
2022-11-01
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| Series: | Materials & Design |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0264127522008619 |
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| author | L.K. Iroc O.U. Tukac B.B. Tanrisevdi O. El-Atwani M.A. Tunes Y.E. Kalay E. Aydogan |
| author_facet | L.K. Iroc O.U. Tukac B.B. Tanrisevdi O. El-Atwani M.A. Tunes Y.E. Kalay E. Aydogan |
| author_sort | L.K. Iroc |
| collection | DOAJ |
| description | Refractory high entropy alloys (RHEAs) are considered promising materials for high-temperature applications due to their thermal stability and high-temperature mechanical properties. However, most RHEAs have high density (>10 g/cm3) and exhibit limited ductility at low temperatures and softening at high temperatures. In this study, we show that oxygen-doping can be used as a new alloy design strategy for tailoring the mechanical behavior of the TiZrHfNbTa alloy: a novel low-density (7.98 g/cm3) ductile RHEA. Even though the material is a single-phase BCC with some oxides at room temperature, secondary BCC and HCP nano-lamellar structures start to form above 600 °C in addition to the nano-twins which are shown to be stable up to 1000 °C. This alloy shows superior strength and compressive ductility due to the nanoengineered microstructure. The present study sheds light on tailoring the strength-ductility balance in RHEAs by controlling the microstructure of novel RHEAs at the nanoscale via oxygen-doping. |
| first_indexed | 2024-04-13T17:02:49Z |
| format | Article |
| id | doaj.art-f4f816b1d85145daa6c4ff14b18b209c |
| institution | Directory Open Access Journal |
| issn | 0264-1275 |
| language | English |
| last_indexed | 2024-04-13T17:02:49Z |
| publishDate | 2022-11-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Materials & Design |
| spelling | doaj.art-f4f816b1d85145daa6c4ff14b18b209c2022-12-22T02:38:36ZengElsevierMaterials & Design0264-12752022-11-01223111239Design of oxygen-doped TiZrHfNbTa refractory high entropy alloys with enhanced strength and ductilityL.K. Iroc0O.U. Tukac1B.B. Tanrisevdi2O. El-Atwani3M.A. Tunes4Y.E. Kalay5E. Aydogan6Department of Metallurgical and Materials Engineering, Middle East Technical University (METU), Ankara 06800, TurkeyDepartment of Metallurgical and Materials Engineering, Middle East Technical University (METU), Ankara 06800, TurkeyDepartment of Metallurgical and Materials Engineering, Middle East Technical University (METU), Ankara 06800, TurkeyMaterials Science and Technology Division, Los Alamos National Laboratory, Los Alamos 87545, NM, USAMaterials Science and Technology Division, Los Alamos National Laboratory, Los Alamos 87545, NM, USADepartment of Metallurgical and Materials Engineering, Middle East Technical University (METU), Ankara 06800, TurkeyDepartment of Metallurgical and Materials Engineering, Middle East Technical University (METU), Ankara 06800, Turkey; Corresponding author.Refractory high entropy alloys (RHEAs) are considered promising materials for high-temperature applications due to their thermal stability and high-temperature mechanical properties. However, most RHEAs have high density (>10 g/cm3) and exhibit limited ductility at low temperatures and softening at high temperatures. In this study, we show that oxygen-doping can be used as a new alloy design strategy for tailoring the mechanical behavior of the TiZrHfNbTa alloy: a novel low-density (7.98 g/cm3) ductile RHEA. Even though the material is a single-phase BCC with some oxides at room temperature, secondary BCC and HCP nano-lamellar structures start to form above 600 °C in addition to the nano-twins which are shown to be stable up to 1000 °C. This alloy shows superior strength and compressive ductility due to the nanoengineered microstructure. The present study sheds light on tailoring the strength-ductility balance in RHEAs by controlling the microstructure of novel RHEAs at the nanoscale via oxygen-doping.http://www.sciencedirect.com/science/article/pii/S0264127522008619Refractory High Entropy Alloys (RHEAs)CALPHADNano-lamellar structuresNanotwinsIn-situ TEM |
| spellingShingle | L.K. Iroc O.U. Tukac B.B. Tanrisevdi O. El-Atwani M.A. Tunes Y.E. Kalay E. Aydogan Design of oxygen-doped TiZrHfNbTa refractory high entropy alloys with enhanced strength and ductility Materials & Design Refractory High Entropy Alloys (RHEAs) CALPHAD Nano-lamellar structures Nanotwins In-situ TEM |
| title | Design of oxygen-doped TiZrHfNbTa refractory high entropy alloys with enhanced strength and ductility |
| title_full | Design of oxygen-doped TiZrHfNbTa refractory high entropy alloys with enhanced strength and ductility |
| title_fullStr | Design of oxygen-doped TiZrHfNbTa refractory high entropy alloys with enhanced strength and ductility |
| title_full_unstemmed | Design of oxygen-doped TiZrHfNbTa refractory high entropy alloys with enhanced strength and ductility |
| title_short | Design of oxygen-doped TiZrHfNbTa refractory high entropy alloys with enhanced strength and ductility |
| title_sort | design of oxygen doped tizrhfnbta refractory high entropy alloys with enhanced strength and ductility |
| topic | Refractory High Entropy Alloys (RHEAs) CALPHAD Nano-lamellar structures Nanotwins In-situ TEM |
| url | http://www.sciencedirect.com/science/article/pii/S0264127522008619 |
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