Temperature-Dependent Mechanical Properties of CoCrFeNi Medium-Entropy Alloy Produced by Laser-Directed Energy Deposition
The temperature dependence of the mechanical properties of the CoCrFeNi medium-entropy alloy (MEA) manufactured by laser-directed energy deposition (L-DED) and additionally annealed at 1200 °C for 24 h was studied. The microstructure of the as-deposited alloy was represented by a single-phase face-c...
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2024-12-01
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| author | Margarita Klimova Igor Krasanov Ilya Astakhov Ekaterina Kovalenko Elizaveta Kochura Anastasia Semenyuk Sergey Zherebtsov Olga Klimova-Korsmik Nikita Stepanov |
| author_facet | Margarita Klimova Igor Krasanov Ilya Astakhov Ekaterina Kovalenko Elizaveta Kochura Anastasia Semenyuk Sergey Zherebtsov Olga Klimova-Korsmik Nikita Stepanov |
| author_sort | Margarita Klimova |
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| description | The temperature dependence of the mechanical properties of the CoCrFeNi medium-entropy alloy (MEA) manufactured by laser-directed energy deposition (L-DED) and additionally annealed at 1200 °C for 24 h was studied. The microstructure of the as-deposited alloy was represented by a single-phase face-centered cubic structure with coarse columnar grains and a high density of dislocation. Annealing resulted in the development of recrystallization and a reduction in dislocation density. The CoCrFeNi alloy produced by L-DED demonstrated mechanical properties comparable with those of the fine-grained equiatomic CoCrFeMnNi alloy, produced by casting followed by thermomechanical processing. Namely, as-deposited CoCrFeNi had a yield strength (YS) and ultimate tensile strength (UTS) of YS = 370 MPa and UTS = 610 MPa at room temperature, and YS = 565 MPa and UTS = 965 MPa at cryogenic temperature, along with a ductility of ~60%. Annealing resulted in a decrease in strength to YS = 180/350 MPa at 293/77 K. A quantitative analysis of various strengthening mechanisms showed that some strength increment of the as-deposited alloy was ensured by the high dislocation density formed during L-DED. |
| format | Article |
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| institution | Kabale University |
| issn | 2075-4701 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | MDPI AG |
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| series | Metals |
| spelling | doaj-art-f5cbad691cf946b2bf4b78d216e8d9852025-01-24T13:41:23ZengMDPI AGMetals2075-47012024-12-01151910.3390/met15010009Temperature-Dependent Mechanical Properties of CoCrFeNi Medium-Entropy Alloy Produced by Laser-Directed Energy DepositionMargarita Klimova0Igor Krasanov1Ilya Astakhov2Ekaterina Kovalenko3Elizaveta Kochura4Anastasia Semenyuk5Sergey Zherebtsov6Olga Klimova-Korsmik7Nikita Stepanov8World-Class Research Center, “Advanced Digital Technologies”, Saint Petersburg State Marine Technical University, 190121 Saint Petersburg, RussiaWorld-Class Research Center, “Advanced Digital Technologies”, Saint Petersburg State Marine Technical University, 190121 Saint Petersburg, RussiaWorld-Class Research Center, “Advanced Digital Technologies”, Saint Petersburg State Marine Technical University, 190121 Saint Petersburg, RussiaWorld-Class Research Center, “Advanced Digital Technologies”, Saint Petersburg State Marine Technical University, 190121 Saint Petersburg, RussiaWorld-Class Research Center, “Advanced Digital Technologies”, Saint Petersburg State Marine Technical University, 190121 Saint Petersburg, RussiaWorld-Class Research Center, “Advanced Digital Technologies”, Saint Petersburg State Marine Technical University, 190121 Saint Petersburg, RussiaWorld-Class Research Center, “Advanced Digital Technologies”, Saint Petersburg State Marine Technical University, 190121 Saint Petersburg, RussiaWorld-Class Research Center, “Advanced Digital Technologies”, Saint Petersburg State Marine Technical University, 190121 Saint Petersburg, RussiaWorld-Class Research Center, “Advanced Digital Technologies”, Saint Petersburg State Marine Technical University, 190121 Saint Petersburg, RussiaThe temperature dependence of the mechanical properties of the CoCrFeNi medium-entropy alloy (MEA) manufactured by laser-directed energy deposition (L-DED) and additionally annealed at 1200 °C for 24 h was studied. The microstructure of the as-deposited alloy was represented by a single-phase face-centered cubic structure with coarse columnar grains and a high density of dislocation. Annealing resulted in the development of recrystallization and a reduction in dislocation density. The CoCrFeNi alloy produced by L-DED demonstrated mechanical properties comparable with those of the fine-grained equiatomic CoCrFeMnNi alloy, produced by casting followed by thermomechanical processing. Namely, as-deposited CoCrFeNi had a yield strength (YS) and ultimate tensile strength (UTS) of YS = 370 MPa and UTS = 610 MPa at room temperature, and YS = 565 MPa and UTS = 965 MPa at cryogenic temperature, along with a ductility of ~60%. Annealing resulted in a decrease in strength to YS = 180/350 MPa at 293/77 K. A quantitative analysis of various strengthening mechanisms showed that some strength increment of the as-deposited alloy was ensured by the high dislocation density formed during L-DED.https://www.mdpi.com/2075-4701/15/1/9high-entropy alloysmedium-entropy alloyslaser-directed energy depositionmechanical properties |
| spellingShingle | Margarita Klimova Igor Krasanov Ilya Astakhov Ekaterina Kovalenko Elizaveta Kochura Anastasia Semenyuk Sergey Zherebtsov Olga Klimova-Korsmik Nikita Stepanov Temperature-Dependent Mechanical Properties of CoCrFeNi Medium-Entropy Alloy Produced by Laser-Directed Energy Deposition Metals high-entropy alloys medium-entropy alloys laser-directed energy deposition mechanical properties |
| title | Temperature-Dependent Mechanical Properties of CoCrFeNi Medium-Entropy Alloy Produced by Laser-Directed Energy Deposition |
| title_full | Temperature-Dependent Mechanical Properties of CoCrFeNi Medium-Entropy Alloy Produced by Laser-Directed Energy Deposition |
| title_fullStr | Temperature-Dependent Mechanical Properties of CoCrFeNi Medium-Entropy Alloy Produced by Laser-Directed Energy Deposition |
| title_full_unstemmed | Temperature-Dependent Mechanical Properties of CoCrFeNi Medium-Entropy Alloy Produced by Laser-Directed Energy Deposition |
| title_short | Temperature-Dependent Mechanical Properties of CoCrFeNi Medium-Entropy Alloy Produced by Laser-Directed Energy Deposition |
| title_sort | temperature dependent mechanical properties of cocrfeni medium entropy alloy produced by laser directed energy deposition |
| topic | high-entropy alloys medium-entropy alloys laser-directed energy deposition mechanical properties |
| url | https://www.mdpi.com/2075-4701/15/1/9 |
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