Influence of Si Content on Microstructure and Mechanical Properties of CoCrFeNi High-Entropy Alloys
CoCrFeNiSi<i><sub>x</sub></i> (where x = 0, 0.5, 1.0, 1.5, 2.0 mol, named as H4, Si<sub>0.5</sub>, Si<sub>1.0</sub>, Si<sub>1.5</sub>, and Si<sub>2.0</sub>, respectively) high-entropy alloys (HEAs) were fabricated via hot-press...
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MDPI AG
2025-05-01
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| author | Yajun Zhou Ruifeng Zhao Bo Ren Aiyun Jiang Zhongxia Liu Jianxiu Liu |
| author_facet | Yajun Zhou Ruifeng Zhao Bo Ren Aiyun Jiang Zhongxia Liu Jianxiu Liu |
| author_sort | Yajun Zhou |
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| description | CoCrFeNiSi<i><sub>x</sub></i> (where x = 0, 0.5, 1.0, 1.5, 2.0 mol, named as H4, Si<sub>0.5</sub>, Si<sub>1.0</sub>, Si<sub>1.5</sub>, and Si<sub>2.0</sub>, respectively) high-entropy alloys (HEAs) were fabricated via hot-press sintering. The effects of Si content on the phase structure, microstructure, and mechanical properties of HEAs were investigated. The results show that the H4 alloy consists of a single FCC phase. As the Si content increases, the phases of CoCrFeNiSi<i><sub>x</sub></i> HEAs transform from the FCC phase to the BCC and silicide phases. An increase in Si content can significantly enhance the hardness and yield strength of the alloys, yet at the expense of their plasticity. When the Si content increases from 0 to 2.0 mol, the hardness of the alloy increases from 280 HV to 1060 HV, the yield strength rises from 760 MPa to 1640 MPa, and the fracture strain drops to 6%. The strengthening mechanism of this HEA system mainly stems from the synergistic effect of solid solution strengthening and precipitation strengthening of silicide phases. |
| format | Article |
| id | doaj-art-d6280d6a579d47e9bd81e03490b6fd22 |
| institution | DOAJ |
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| language | English |
| publishDate | 2025-05-01 |
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| spelling | doaj-art-d6280d6a579d47e9bd81e03490b6fd222025-08-20T03:14:32ZengMDPI AGMetals2075-47012025-05-0115553810.3390/met15050538Influence of Si Content on Microstructure and Mechanical Properties of CoCrFeNi High-Entropy AlloysYajun Zhou0Ruifeng Zhao1Bo Ren2Aiyun Jiang3Zhongxia Liu4Jianxiu Liu5Faculty of Engineering, Huanghe Science and Technology College, Zhengzhou 450006, ChinaSchool of Mechanical Engineering, Henan University of Engineering, Zhengzhou 451191, ChinaFaculty of Engineering, Huanghe Science and Technology College, Zhengzhou 450006, ChinaFaculty of Engineering, Huanghe Science and Technology College, Zhengzhou 450006, ChinaFaculty of Engineering, Huanghe Science and Technology College, Zhengzhou 450006, ChinaFaculty of Engineering, Huanghe Science and Technology College, Zhengzhou 450006, ChinaCoCrFeNiSi<i><sub>x</sub></i> (where x = 0, 0.5, 1.0, 1.5, 2.0 mol, named as H4, Si<sub>0.5</sub>, Si<sub>1.0</sub>, Si<sub>1.5</sub>, and Si<sub>2.0</sub>, respectively) high-entropy alloys (HEAs) were fabricated via hot-press sintering. The effects of Si content on the phase structure, microstructure, and mechanical properties of HEAs were investigated. The results show that the H4 alloy consists of a single FCC phase. As the Si content increases, the phases of CoCrFeNiSi<i><sub>x</sub></i> HEAs transform from the FCC phase to the BCC and silicide phases. An increase in Si content can significantly enhance the hardness and yield strength of the alloys, yet at the expense of their plasticity. When the Si content increases from 0 to 2.0 mol, the hardness of the alloy increases from 280 HV to 1060 HV, the yield strength rises from 760 MPa to 1640 MPa, and the fracture strain drops to 6%. The strengthening mechanism of this HEA system mainly stems from the synergistic effect of solid solution strengthening and precipitation strengthening of silicide phases.https://www.mdpi.com/2075-4701/15/5/538high-entropy alloyhot-press sinteringSi contentmicrostructuremechanical property |
| spellingShingle | Yajun Zhou Ruifeng Zhao Bo Ren Aiyun Jiang Zhongxia Liu Jianxiu Liu Influence of Si Content on Microstructure and Mechanical Properties of CoCrFeNi High-Entropy Alloys Metals high-entropy alloy hot-press sintering Si content microstructure mechanical property |
| title | Influence of Si Content on Microstructure and Mechanical Properties of CoCrFeNi High-Entropy Alloys |
| title_full | Influence of Si Content on Microstructure and Mechanical Properties of CoCrFeNi High-Entropy Alloys |
| title_fullStr | Influence of Si Content on Microstructure and Mechanical Properties of CoCrFeNi High-Entropy Alloys |
| title_full_unstemmed | Influence of Si Content on Microstructure and Mechanical Properties of CoCrFeNi High-Entropy Alloys |
| title_short | Influence of Si Content on Microstructure and Mechanical Properties of CoCrFeNi High-Entropy Alloys |
| title_sort | influence of si content on microstructure and mechanical properties of cocrfeni high entropy alloys |
| topic | high-entropy alloy hot-press sintering Si content microstructure mechanical property |
| url | https://www.mdpi.com/2075-4701/15/5/538 |
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