Influence of the Al Content on the Properties of Mechanically Alloyed CoCrFeNiMn<sub>X</sub>Al<sub>20−X</sub> High-Entropy Alloys
The equiatomic CoCrFeNiMn alloy prepared by mechanical alloying and spark plasma sintering underwent partial substitution of Mn by Al (5, 10 and 15 at.%) to determine its influence on mechanical properties and thermal stability. It was discovered that the higher the Al content, the higher the volume...
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MDPI AG
2022-11-01
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| Online Access: | https://www.mdpi.com/1996-1944/15/22/7899 |
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| author | Hana Thürlová Filip Průša |
| author_facet | Hana Thürlová Filip Průša |
| author_sort | Hana Thürlová |
| collection | DOAJ |
| description | The equiatomic CoCrFeNiMn alloy prepared by mechanical alloying and spark plasma sintering underwent partial substitution of Mn by Al (5, 10 and 15 at.%) to determine its influence on mechanical properties and thermal stability. It was discovered that the higher the Al content, the higher the volume fraction of the hard phase with primitive cubic (PC) crystallographic lattice, which increases the hardness and strength of the alloys. The most promising mechanical properties have been achieved in the CoCrFeNiMn5Al15 alloy reaching the compressive yield strength (CYS) of 2135 ± 21 MPa and the ultimate compressive strength (UCS) of 2496 ± 21 MPa. All the prepared alloys showed good thermal stability as they maintained or only slightly reduced their initial hardness during the 100 h annealing at 800 °C. Furthermore, the higher the Al content, the higher the resistance against high-temperature oxidation. The oxidic layer changed its composition from Mn-oxides (CoCrFeNiMn15Al15 alloy) to Al-based oxides with exceptional protective properties. |
| first_indexed | 2024-03-09T18:13:17Z |
| format | Article |
| id | doaj.art-e72be6655102413aa83637be12dfb623 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T18:13:17Z |
| publishDate | 2022-11-01 |
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| spelling | doaj.art-e72be6655102413aa83637be12dfb6232023-11-24T09:00:49ZengMDPI AGMaterials1996-19442022-11-011522789910.3390/ma15227899Influence of the Al Content on the Properties of Mechanically Alloyed CoCrFeNiMn<sub>X</sub>Al<sub>20−X</sub> High-Entropy AlloysHana Thürlová0Filip Průša1Department of Metals and Corrosion Engineering, University of Chemistry and Technology Prague, Technická 5, 166 28 Prague, Czech RepublicDepartment of Metals and Corrosion Engineering, University of Chemistry and Technology Prague, Technická 5, 166 28 Prague, Czech RepublicThe equiatomic CoCrFeNiMn alloy prepared by mechanical alloying and spark plasma sintering underwent partial substitution of Mn by Al (5, 10 and 15 at.%) to determine its influence on mechanical properties and thermal stability. It was discovered that the higher the Al content, the higher the volume fraction of the hard phase with primitive cubic (PC) crystallographic lattice, which increases the hardness and strength of the alloys. The most promising mechanical properties have been achieved in the CoCrFeNiMn5Al15 alloy reaching the compressive yield strength (CYS) of 2135 ± 21 MPa and the ultimate compressive strength (UCS) of 2496 ± 21 MPa. All the prepared alloys showed good thermal stability as they maintained or only slightly reduced their initial hardness during the 100 h annealing at 800 °C. Furthermore, the higher the Al content, the higher the resistance against high-temperature oxidation. The oxidic layer changed its composition from Mn-oxides (CoCrFeNiMn15Al15 alloy) to Al-based oxides with exceptional protective properties.https://www.mdpi.com/1996-1944/15/22/7899mechanical alloyinghigh-entropy alloysmicrostructuremechanical propertieshigh-temperature resistancehigh-temperature oxidation |
| spellingShingle | Hana Thürlová Filip Průša Influence of the Al Content on the Properties of Mechanically Alloyed CoCrFeNiMn<sub>X</sub>Al<sub>20−X</sub> High-Entropy Alloys Materials mechanical alloying high-entropy alloys microstructure mechanical properties high-temperature resistance high-temperature oxidation |
| title | Influence of the Al Content on the Properties of Mechanically Alloyed CoCrFeNiMn<sub>X</sub>Al<sub>20−X</sub> High-Entropy Alloys |
| title_full | Influence of the Al Content on the Properties of Mechanically Alloyed CoCrFeNiMn<sub>X</sub>Al<sub>20−X</sub> High-Entropy Alloys |
| title_fullStr | Influence of the Al Content on the Properties of Mechanically Alloyed CoCrFeNiMn<sub>X</sub>Al<sub>20−X</sub> High-Entropy Alloys |
| title_full_unstemmed | Influence of the Al Content on the Properties of Mechanically Alloyed CoCrFeNiMn<sub>X</sub>Al<sub>20−X</sub> High-Entropy Alloys |
| title_short | Influence of the Al Content on the Properties of Mechanically Alloyed CoCrFeNiMn<sub>X</sub>Al<sub>20−X</sub> High-Entropy Alloys |
| title_sort | influence of the al content on the properties of mechanically alloyed cocrfenimn sub x sub al sub 20 x sub high entropy alloys |
| topic | mechanical alloying high-entropy alloys microstructure mechanical properties high-temperature resistance high-temperature oxidation |
| url | https://www.mdpi.com/1996-1944/15/22/7899 |
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