Synergistic effect of Nb and Ta alloying on microstructure and mechanical properties of CoCrFeNi high-entropy alloy
CoCrFeNi-(Nb, Ta) high-entropy alloys (HEAs) were prepared by a vacuum arc melting process, and the synergistic effect of Nb and Ta concentrations on the microstructure evolution and mechanical properties was investigated in detail. Nb and Ta concentrations in the HEAs affect the microstructure comp...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | zho |
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Journal of Materials Engineering
2024-01-01
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| Series: | Cailiao gongcheng |
| Subjects: | |
| Online Access: | http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2023.000569 |
| _version_ | 1827365849532465152 |
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| author | ZHU Zhe SHI Zengmin YE Xicong WANG Kesheng LEI Haofeng DENG-LI Chengui LI Guangyu DAI Lei |
| author_facet | ZHU Zhe SHI Zengmin YE Xicong WANG Kesheng LEI Haofeng DENG-LI Chengui LI Guangyu DAI Lei |
| author_sort | ZHU Zhe |
| collection | DOAJ |
| description | CoCrFeNi-(Nb, Ta) high-entropy alloys (HEAs) were prepared by a vacuum arc melting process, and the synergistic effect of Nb and Ta concentrations on the microstructure evolution and mechanical properties was investigated in detail. Nb and Ta concentrations in the HEAs affect the microstructure compositions, eutectic phase lamella spacings, Laves phase size topographies, phase volume fractions and compositions. The alloy with an equal atomic ratio of Nb/Ta show an eutectic microstructure of the face centered cubic (FCC) crystal matrix and Laves phase, while those with non-equal atomic ratio of Nb/Ta exhibit the microstructure of the eutectic (FCC+Laves) phase and primary Laves phase. The volume fraction and grain size of the primary Laves phase monotonically increase with the increase of Nb/Ta atomic ratio. The compressive yield strength of HEAs is monotonously improved with the volume fraction of Laves phase, whereas the ultimate strength is hardly affected by the microstructure composition. Compression plasticity is negatively correlated with the volume fraction, type, and size distribution of Laves phase. The strengthening mechanism of CoCrFeNi-(Nb, Ta) HEAs was analyzed with theoretical calculation, and the relationship between the microstructure composition and the alloy strengths was established. The results indicate that the fine-grain strengthening and second phase strengthening of Laves phase are the main factors for the improvement of yield strength. |
| first_indexed | 2024-03-08T08:37:38Z |
| format | Article |
| id | doaj.art-c1592a750fea41f48ad3619256dcffd2 |
| institution | Directory Open Access Journal |
| issn | 1001-4381 |
| language | zho |
| last_indexed | 2024-03-08T08:37:38Z |
| publishDate | 2024-01-01 |
| publisher | Journal of Materials Engineering |
| record_format | Article |
| series | Cailiao gongcheng |
| spelling | doaj.art-c1592a750fea41f48ad3619256dcffd22024-02-02T00:34:38ZzhoJournal of Materials EngineeringCailiao gongcheng1001-43812024-01-0152116517410.11868/j.issn.1001-4381.2023.00056920240115Synergistic effect of Nb and Ta alloying on microstructure and mechanical properties of CoCrFeNi high-entropy alloyZHU Zhe0SHI Zengmin1YE Xicong2WANG Kesheng3LEI Haofeng4DENG-LI Chengui5LI Guangyu6DAI Lei7Hubei Key Laboratory of Hydroelectric Machinery Design & Maintenance, China Three Gorges University, Yichang 443002, Hubei, ChinaHubei Key Laboratory of Hydroelectric Machinery Design & Maintenance, China Three Gorges University, Yichang 443002, Hubei, ChinaHubei Key Laboratory of Hydroelectric Machinery Design & Maintenance, China Three Gorges University, Yichang 443002, Hubei, ChinaHubei Key Laboratory of Hydroelectric Machinery Design & Maintenance, China Three Gorges University, Yichang 443002, Hubei, ChinaHubei Key Laboratory of Hydroelectric Machinery Design & Maintenance, China Three Gorges University, Yichang 443002, Hubei, ChinaHubei Key Laboratory of Hydroelectric Machinery Design & Maintenance, China Three Gorges University, Yichang 443002, Hubei, ChinaHubei Key Laboratory of Hydroelectric Machinery Design & Maintenance, China Three Gorges University, Yichang 443002, Hubei, ChinaHubei Key Laboratory of Hydroelectric Machinery Design & Maintenance, China Three Gorges University, Yichang 443002, Hubei, ChinaCoCrFeNi-(Nb, Ta) high-entropy alloys (HEAs) were prepared by a vacuum arc melting process, and the synergistic effect of Nb and Ta concentrations on the microstructure evolution and mechanical properties was investigated in detail. Nb and Ta concentrations in the HEAs affect the microstructure compositions, eutectic phase lamella spacings, Laves phase size topographies, phase volume fractions and compositions. The alloy with an equal atomic ratio of Nb/Ta show an eutectic microstructure of the face centered cubic (FCC) crystal matrix and Laves phase, while those with non-equal atomic ratio of Nb/Ta exhibit the microstructure of the eutectic (FCC+Laves) phase and primary Laves phase. The volume fraction and grain size of the primary Laves phase monotonically increase with the increase of Nb/Ta atomic ratio. The compressive yield strength of HEAs is monotonously improved with the volume fraction of Laves phase, whereas the ultimate strength is hardly affected by the microstructure composition. Compression plasticity is negatively correlated with the volume fraction, type, and size distribution of Laves phase. The strengthening mechanism of CoCrFeNi-(Nb, Ta) HEAs was analyzed with theoretical calculation, and the relationship between the microstructure composition and the alloy strengths was established. The results indicate that the fine-grain strengthening and second phase strengthening of Laves phase are the main factors for the improvement of yield strength.http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2023.000569high-entropy alloyssynergistic alloyingmicrostructurelaves phaseyield strength |
| spellingShingle | ZHU Zhe SHI Zengmin YE Xicong WANG Kesheng LEI Haofeng DENG-LI Chengui LI Guangyu DAI Lei Synergistic effect of Nb and Ta alloying on microstructure and mechanical properties of CoCrFeNi high-entropy alloy Cailiao gongcheng high-entropy alloys synergistic alloying microstructure laves phase yield strength |
| title | Synergistic effect of Nb and Ta alloying on microstructure and mechanical properties of CoCrFeNi high-entropy alloy |
| title_full | Synergistic effect of Nb and Ta alloying on microstructure and mechanical properties of CoCrFeNi high-entropy alloy |
| title_fullStr | Synergistic effect of Nb and Ta alloying on microstructure and mechanical properties of CoCrFeNi high-entropy alloy |
| title_full_unstemmed | Synergistic effect of Nb and Ta alloying on microstructure and mechanical properties of CoCrFeNi high-entropy alloy |
| title_short | Synergistic effect of Nb and Ta alloying on microstructure and mechanical properties of CoCrFeNi high-entropy alloy |
| title_sort | synergistic effect of nb and ta alloying on microstructure and mechanical properties of cocrfeni high entropy alloy |
| topic | high-entropy alloys synergistic alloying microstructure laves phase yield strength |
| url | http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2023.000569 |
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