Phase Prediction, Microstructure and Mechanical Properties of Fe–Mn–Ni–Cr–Al–Si High Entropy Alloys
The selection of high-entropy alloys (HEAs), which are relatively lightweight and have unique mechanical properties, remains a substantial challenge. In this study, six new HEAs were designed from the relatively low-cost Fe–Mn–Ni–Cr–Al–Si system using Thermo-Calc software, and then manufactured usin...
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MDPI AG
2022-07-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/12/7/1164 |
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| author | Essam R. I. Mahmoud Awaluddin Shaharoun Mohamed A. Gepreel Saad Ebied |
| author_facet | Essam R. I. Mahmoud Awaluddin Shaharoun Mohamed A. Gepreel Saad Ebied |
| author_sort | Essam R. I. Mahmoud |
| collection | DOAJ |
| description | The selection of high-entropy alloys (HEAs), which are relatively lightweight and have unique mechanical properties, remains a substantial challenge. In this study, six new HEAs were designed from the relatively low-cost Fe–Mn–Ni–Cr–Al–Si system using Thermo-Calc software, and then manufactured using a casting process. The effects of the atomic ratio of the alloying elements on the microstructures and mechanical properties of these alloys in the as-cast condition were systematically investigated. Brittle body-centered cubic BCC/B2 and silicide phases were found in relatively large amounts in the form of dendritic structure within large equiaxed grains with fine needle-shaped phases in the Fe<sub>30</sub>Mn<sub>15</sub>Ni<sub>20</sub>Cr<sub>15</sub>Al<sub>10</sub>Si<sub>10</sub> and Fe<sub>35</sub>Mn<sub>15</sub>Ni<sub>20</sub>Cr<sub>15</sub>Al<sub>10</sub>Si<sub>5</sub> alloys, in addition to the face-centered cubic (FCC) phase. When the contents of Mn and Ni were increased in the Fe<sub>35</sub>Mn<sub>25</sub>Ni<sub>15</sub>Cr<sub>15</sub>Al<sub>5</sub>Si<sub>5</sub> and Fe<sub>35</sub>Mn<sub>20</sub>Ni<sub>20</sub>Cr<sub>15</sub>Al<sub>5</sub>Si<sub>5</sub> alloys, the amounts of brittle phases were reduced; however, the ductile FCC phase is not significant. The FCC phase amount, which appeared as a honeycombed structure, was more than enough when the Si content was decreased to 3%. Broad relationships between the chemical composition of the alloys, especially the Si content, and the hardness and compression properties’ measurements were established. As the Si content decreased, both the hardness and compression properties of the resulting alloy also decreased. The experimental observation of the six HEAs matched the equilibrium phases predicted by the Thermo-Calc calculations. |
| first_indexed | 2024-03-09T13:22:11Z |
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| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-09T13:22:11Z |
| publishDate | 2022-07-01 |
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| spelling | doaj.art-424eb6039bef425dabf8f4f6d5f55aae2023-11-30T21:27:58ZengMDPI AGMetals2075-47012022-07-01127116410.3390/met12071164Phase Prediction, Microstructure and Mechanical Properties of Fe–Mn–Ni–Cr–Al–Si High Entropy AlloysEssam R. I. Mahmoud0Awaluddin Shaharoun1Mohamed A. Gepreel2Saad Ebied3Department of Mechanical Engineering, Islamic University of Madinah, Madinah 42351, Saudi ArabiaDepartment of Mechanical Engineering, Islamic University of Madinah, Madinah 42351, Saudi ArabiaMaterials Science and Engineering Department, Egypt-Japan University of Science and Technology, New Borg El-Arab 16448, EgyptDepartment of Production Engineering and Mechanical Design, Faculty of Engineering, Tanta University, Tanta 31527, EgyptThe selection of high-entropy alloys (HEAs), which are relatively lightweight and have unique mechanical properties, remains a substantial challenge. In this study, six new HEAs were designed from the relatively low-cost Fe–Mn–Ni–Cr–Al–Si system using Thermo-Calc software, and then manufactured using a casting process. The effects of the atomic ratio of the alloying elements on the microstructures and mechanical properties of these alloys in the as-cast condition were systematically investigated. Brittle body-centered cubic BCC/B2 and silicide phases were found in relatively large amounts in the form of dendritic structure within large equiaxed grains with fine needle-shaped phases in the Fe<sub>30</sub>Mn<sub>15</sub>Ni<sub>20</sub>Cr<sub>15</sub>Al<sub>10</sub>Si<sub>10</sub> and Fe<sub>35</sub>Mn<sub>15</sub>Ni<sub>20</sub>Cr<sub>15</sub>Al<sub>10</sub>Si<sub>5</sub> alloys, in addition to the face-centered cubic (FCC) phase. When the contents of Mn and Ni were increased in the Fe<sub>35</sub>Mn<sub>25</sub>Ni<sub>15</sub>Cr<sub>15</sub>Al<sub>5</sub>Si<sub>5</sub> and Fe<sub>35</sub>Mn<sub>20</sub>Ni<sub>20</sub>Cr<sub>15</sub>Al<sub>5</sub>Si<sub>5</sub> alloys, the amounts of brittle phases were reduced; however, the ductile FCC phase is not significant. The FCC phase amount, which appeared as a honeycombed structure, was more than enough when the Si content was decreased to 3%. Broad relationships between the chemical composition of the alloys, especially the Si content, and the hardness and compression properties’ measurements were established. As the Si content decreased, both the hardness and compression properties of the resulting alloy also decreased. The experimental observation of the six HEAs matched the equilibrium phases predicted by the Thermo-Calc calculations.https://www.mdpi.com/2075-4701/12/7/1164high-entropy alloythermo-calc calculationcastingmicrostructure analysishardness measurements |
| spellingShingle | Essam R. I. Mahmoud Awaluddin Shaharoun Mohamed A. Gepreel Saad Ebied Phase Prediction, Microstructure and Mechanical Properties of Fe–Mn–Ni–Cr–Al–Si High Entropy Alloys Metals high-entropy alloy thermo-calc calculation casting microstructure analysis hardness measurements |
| title | Phase Prediction, Microstructure and Mechanical Properties of Fe–Mn–Ni–Cr–Al–Si High Entropy Alloys |
| title_full | Phase Prediction, Microstructure and Mechanical Properties of Fe–Mn–Ni–Cr–Al–Si High Entropy Alloys |
| title_fullStr | Phase Prediction, Microstructure and Mechanical Properties of Fe–Mn–Ni–Cr–Al–Si High Entropy Alloys |
| title_full_unstemmed | Phase Prediction, Microstructure and Mechanical Properties of Fe–Mn–Ni–Cr–Al–Si High Entropy Alloys |
| title_short | Phase Prediction, Microstructure and Mechanical Properties of Fe–Mn–Ni–Cr–Al–Si High Entropy Alloys |
| title_sort | phase prediction microstructure and mechanical properties of fe mn ni cr al si high entropy alloys |
| topic | high-entropy alloy thermo-calc calculation casting microstructure analysis hardness measurements |
| url | https://www.mdpi.com/2075-4701/12/7/1164 |
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