Edge-dislocation-induced ultrahigh elevated-temperature strength of HfMoNbTaW refractory high-entropy alloys
Over 150 refractory high-entropy alloys (RHEAs) have been proposed in the last decade. Early alloys such as MoNbTaW and MoNbTaVW still show an unparalleled yield strength of approximately 400 MPa at 1600°C. However, RHEAs with even elevated high-temperature strength are necessary in aerospace vehicl...
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Taylor & Francis Group
2022-12-01
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| Series: | Science and Technology of Advanced Materials |
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| Online Access: | https://www.tandfonline.com/doi/10.1080/14686996.2022.2129444 |
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| author | Ko-Kai Tseng Hao-Hsuan Huang Woei-Ren Wang Jien-Wei Yeh Che-Wei Tsai |
| author_facet | Ko-Kai Tseng Hao-Hsuan Huang Woei-Ren Wang Jien-Wei Yeh Che-Wei Tsai |
| author_sort | Ko-Kai Tseng |
| collection | DOAJ |
| description | Over 150 refractory high-entropy alloys (RHEAs) have been proposed in the last decade. Early alloys such as MoNbTaW and MoNbTaVW still show an unparalleled yield strength of approximately 400 MPa at 1600°C. However, RHEAs with even elevated high-temperature strength are necessary in aerospace vehicles and nuclear reactors to cope with advanced technology in the future. Here, solid-solution strengthening calculation and melting point prediction are combined to design single-phase RHEA for attaining ultrahigh strength at 1600°C. The results show that Hf0.5MoNbTaW and HfMoNbTaW alloys after fully homogeneous treatment at 2100°C for 2 h reveal a homogenous body-centered cubic phase. HfMoNbTaW alloy exhibits a yield strength of 571 MPa at 1600°C, much higher than that of MoNbTaVW (477 MPa). It is found that a plateau of strength occurs from 800°C to 1200°C, which is important for raising the strength level of RHEAs at high temperatures. This strengthening mechanism is explained with the change of deformation mode from screw to edge dislocations, which contributes an edge-dislocation-induced strength. A similar alloy design strategy could be applied to develop more RHEAs with an ultrahigh strength level. |
| format | Article |
| id | doaj-art-8c1e8eee31ff4ef0b85dc2381c79a0d7 |
| institution | DOAJ |
| issn | 1468-6996 1878-5514 |
| language | English |
| publishDate | 2022-12-01 |
| publisher | Taylor & Francis Group |
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| series | Science and Technology of Advanced Materials |
| spelling | doaj-art-8c1e8eee31ff4ef0b85dc2381c79a0d72025-08-20T03:07:47ZengTaylor & Francis GroupScience and Technology of Advanced Materials1468-69961878-55142022-12-0123164265410.1080/14686996.2022.2129444Edge-dislocation-induced ultrahigh elevated-temperature strength of HfMoNbTaW refractory high-entropy alloysKo-Kai Tseng0Hao-Hsuan Huang1Woei-Ren Wang2Jien-Wei Yeh3Che-Wei Tsai4Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, Taiwan, ROCDepartment of Materials Science and Engineering, National Tsing Hua University, Hsinchu, Taiwan, ROCDepartment of Additive Manufacturing Materials & Applications, Division of Metallic Materials Research, Material and Chemical Research Laboratories, Industrial Technology Research Institute, Tainan, Taiwan, ROCDepartment of Materials Science and Engineering, National Tsing Hua University, Hsinchu, Taiwan, ROCDepartment of Materials Science and Engineering, National Tsing Hua University, Hsinchu, Taiwan, ROCOver 150 refractory high-entropy alloys (RHEAs) have been proposed in the last decade. Early alloys such as MoNbTaW and MoNbTaVW still show an unparalleled yield strength of approximately 400 MPa at 1600°C. However, RHEAs with even elevated high-temperature strength are necessary in aerospace vehicles and nuclear reactors to cope with advanced technology in the future. Here, solid-solution strengthening calculation and melting point prediction are combined to design single-phase RHEA for attaining ultrahigh strength at 1600°C. The results show that Hf0.5MoNbTaW and HfMoNbTaW alloys after fully homogeneous treatment at 2100°C for 2 h reveal a homogenous body-centered cubic phase. HfMoNbTaW alloy exhibits a yield strength of 571 MPa at 1600°C, much higher than that of MoNbTaVW (477 MPa). It is found that a plateau of strength occurs from 800°C to 1200°C, which is important for raising the strength level of RHEAs at high temperatures. This strengthening mechanism is explained with the change of deformation mode from screw to edge dislocations, which contributes an edge-dislocation-induced strength. A similar alloy design strategy could be applied to develop more RHEAs with an ultrahigh strength level.https://www.tandfonline.com/doi/10.1080/14686996.2022.2129444High-entropy alloysrefractory high-entropy alloyssolid-solution strengtheningultrahigh elevated-temperature strengthdislocationsslip mode |
| spellingShingle | Ko-Kai Tseng Hao-Hsuan Huang Woei-Ren Wang Jien-Wei Yeh Che-Wei Tsai Edge-dislocation-induced ultrahigh elevated-temperature strength of HfMoNbTaW refractory high-entropy alloys Science and Technology of Advanced Materials High-entropy alloys refractory high-entropy alloys solid-solution strengthening ultrahigh elevated-temperature strength dislocations slip mode |
| title | Edge-dislocation-induced ultrahigh elevated-temperature strength of HfMoNbTaW refractory high-entropy alloys |
| title_full | Edge-dislocation-induced ultrahigh elevated-temperature strength of HfMoNbTaW refractory high-entropy alloys |
| title_fullStr | Edge-dislocation-induced ultrahigh elevated-temperature strength of HfMoNbTaW refractory high-entropy alloys |
| title_full_unstemmed | Edge-dislocation-induced ultrahigh elevated-temperature strength of HfMoNbTaW refractory high-entropy alloys |
| title_short | Edge-dislocation-induced ultrahigh elevated-temperature strength of HfMoNbTaW refractory high-entropy alloys |
| title_sort | edge dislocation induced ultrahigh elevated temperature strength of hfmonbtaw refractory high entropy alloys |
| topic | High-entropy alloys refractory high-entropy alloys solid-solution strengthening ultrahigh elevated-temperature strength dislocations slip mode |
| url | https://www.tandfonline.com/doi/10.1080/14686996.2022.2129444 |
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