Combustion Synthesis and Reactive Spark Plasma Sintering of Non-Equiatomic CoAl-Based High Entropy Intermetallics
The present work reports the direct production of a high-entropy (HE) intermetallic CoNi<sub>0.3</sub>Fe<sub>0.3</sub>Cr<sub>0.15</sub>Al material with a B2 structure from mechanically activated elemental powder mixtures. Fast and efficient combustion synthesis (C...
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2023-02-01
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| author | Kirill Vasilevich Kuskov Andrey A. Nepapushev Sofiya Aydinyan Dmitry G. Shaysultanov Nikita D. Stepanov Khachik Nazaretyan Suren Kharatyan Elena V. Zakharova Dmitry S. Belov Dmitry O. Moskovskikh |
| author_facet | Kirill Vasilevich Kuskov Andrey A. Nepapushev Sofiya Aydinyan Dmitry G. Shaysultanov Nikita D. Stepanov Khachik Nazaretyan Suren Kharatyan Elena V. Zakharova Dmitry S. Belov Dmitry O. Moskovskikh |
| author_sort | Kirill Vasilevich Kuskov |
| collection | DOAJ |
| description | The present work reports the direct production of a high-entropy (HE) intermetallic CoNi<sub>0.3</sub>Fe<sub>0.3</sub>Cr<sub>0.15</sub>Al material with a B2 structure from mechanically activated elemental powder mixtures. Fast and efficient combustion synthesis (CS), spark plasma sintering (SPS), and reactive SPS (RSPS) methods were used to synthesize the HE powders and bulks. The formation of the main B2 phase along with some amounts of secondary BCC and FCC phases are reported, and L12 intermetallic (CS scheme) and BCC based on Cr (CS + SPS and RSPS schemes at 1000 °C) were observed in all samples. The interaction between the components during heating to 1600 °C of the mechanically activated mixtures and CS powders has been studied. It has been shown that the formation of the CoNi<sub>0.3</sub>Fe<sub>0.3</sub>Cr<sub>0.15</sub>Al phase occurs at 1370 °C through the formation of intermediate intermetallic phases (Al<sub>9</sub>Me<sub>2</sub>, AlCo, AlNi<sub>3</sub>) and their solid solutions, which coincidences well with thermodynamic calculations and solubility diagrams. Compression tests at room and elevated temperatures showed that the alloy obtained by the RSPS method has enhanced mechanical properties (σ<sub>p</sub> = 2.79 GPa, σ<sub>0.2</sub> = 1.82 GPa, ε = 11.5% at 400 °C) that surpass many known alloys in this system. High mechanical properties at elevated temperatures are provided by the B2 ordered phase due to the presence of impurity atoms and defects in the lattice. |
| first_indexed | 2024-03-11T08:29:58Z |
| format | Article |
| id | doaj.art-fbc1c051b2e74145aca4ffabc8c8943a |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-11T08:29:58Z |
| publishDate | 2023-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-fbc1c051b2e74145aca4ffabc8c8943a2023-11-16T21:50:30ZengMDPI AGMaterials1996-19442023-02-01164149010.3390/ma16041490Combustion Synthesis and Reactive Spark Plasma Sintering of Non-Equiatomic CoAl-Based High Entropy IntermetallicsKirill Vasilevich Kuskov0Andrey A. Nepapushev1Sofiya Aydinyan2Dmitry G. Shaysultanov3Nikita D. Stepanov4Khachik Nazaretyan5Suren Kharatyan6Elena V. Zakharova7Dmitry S. Belov8Dmitry O. Moskovskikh9Center of Functional Nano-Ceramics, National University of Science and Technology MISiS, 119049 Moscow, RussiaCenter of Functional Nano-Ceramics, National University of Science and Technology MISiS, 119049 Moscow, RussiaDepartment of Mechanical and Industrial Engineering, Tallinn University of Technology, 19086 Tallinn, EstoniaLaboratory of Bulk Nanostructured Materials, Belgorod State University, 308015 Belgorod, RussiaLaboratory of Bulk Nanostructured Materials, Belgorod State University, 308015 Belgorod, RussiaLaboratory of Macrokinetics of Solid State Reactions, A.B. Nalbandyan Institute of Chemical Physics, Yerevan 0014, ArmeniaLaboratory of Macrokinetics of Solid State Reactions, A.B. Nalbandyan Institute of Chemical Physics, Yerevan 0014, ArmeniaDepartment of Functional Nanosystems and High-Temperature Materials, National University of Science and Technology MISiS, 119049 Moscow, RussiaDepartment of Functional Nanosystems and High-Temperature Materials, National University of Science and Technology MISiS, 119049 Moscow, RussiaCenter of Functional Nano-Ceramics, National University of Science and Technology MISiS, 119049 Moscow, RussiaThe present work reports the direct production of a high-entropy (HE) intermetallic CoNi<sub>0.3</sub>Fe<sub>0.3</sub>Cr<sub>0.15</sub>Al material with a B2 structure from mechanically activated elemental powder mixtures. Fast and efficient combustion synthesis (CS), spark plasma sintering (SPS), and reactive SPS (RSPS) methods were used to synthesize the HE powders and bulks. The formation of the main B2 phase along with some amounts of secondary BCC and FCC phases are reported, and L12 intermetallic (CS scheme) and BCC based on Cr (CS + SPS and RSPS schemes at 1000 °C) were observed in all samples. The interaction between the components during heating to 1600 °C of the mechanically activated mixtures and CS powders has been studied. It has been shown that the formation of the CoNi<sub>0.3</sub>Fe<sub>0.3</sub>Cr<sub>0.15</sub>Al phase occurs at 1370 °C through the formation of intermediate intermetallic phases (Al<sub>9</sub>Me<sub>2</sub>, AlCo, AlNi<sub>3</sub>) and their solid solutions, which coincidences well with thermodynamic calculations and solubility diagrams. Compression tests at room and elevated temperatures showed that the alloy obtained by the RSPS method has enhanced mechanical properties (σ<sub>p</sub> = 2.79 GPa, σ<sub>0.2</sub> = 1.82 GPa, ε = 11.5% at 400 °C) that surpass many known alloys in this system. High mechanical properties at elevated temperatures are provided by the B2 ordered phase due to the presence of impurity atoms and defects in the lattice.https://www.mdpi.com/1996-1944/16/4/1490intermetallicshigh-entropy materialsmechanical activationhigh-energy ball millingsinteringmechanical properties |
| spellingShingle | Kirill Vasilevich Kuskov Andrey A. Nepapushev Sofiya Aydinyan Dmitry G. Shaysultanov Nikita D. Stepanov Khachik Nazaretyan Suren Kharatyan Elena V. Zakharova Dmitry S. Belov Dmitry O. Moskovskikh Combustion Synthesis and Reactive Spark Plasma Sintering of Non-Equiatomic CoAl-Based High Entropy Intermetallics Materials intermetallics high-entropy materials mechanical activation high-energy ball milling sintering mechanical properties |
| title | Combustion Synthesis and Reactive Spark Plasma Sintering of Non-Equiatomic CoAl-Based High Entropy Intermetallics |
| title_full | Combustion Synthesis and Reactive Spark Plasma Sintering of Non-Equiatomic CoAl-Based High Entropy Intermetallics |
| title_fullStr | Combustion Synthesis and Reactive Spark Plasma Sintering of Non-Equiatomic CoAl-Based High Entropy Intermetallics |
| title_full_unstemmed | Combustion Synthesis and Reactive Spark Plasma Sintering of Non-Equiatomic CoAl-Based High Entropy Intermetallics |
| title_short | Combustion Synthesis and Reactive Spark Plasma Sintering of Non-Equiatomic CoAl-Based High Entropy Intermetallics |
| title_sort | combustion synthesis and reactive spark plasma sintering of non equiatomic coal based high entropy intermetallics |
| topic | intermetallics high-entropy materials mechanical activation high-energy ball milling sintering mechanical properties |
| url | https://www.mdpi.com/1996-1944/16/4/1490 |
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