Laves Phase Formation in High Entropy Alloys
One of the intriguing recent results in the field of high-entropy alloys is the discovery of single-phase equiatomic multi-component Laves intermetallics. However, there is no clear understanding that a combination of chemical elements will form such high-entropy compounds. Here we contribute to und...
| Main Authors: | , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2021-12-01
|
| Series: | Metals |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2075-4701/11/12/1962 |
| _version_ | 1797502491932229632 |
|---|---|
| author | Roman Ryltsev Vasiliy Gaviko Svetlana Estemirova Evgenii Sterkhov Lubov Cherepanova Denis Yagodin Nikolay Chtchelkatchev Nikolay Dubinin Sergey Uporov |
| author_facet | Roman Ryltsev Vasiliy Gaviko Svetlana Estemirova Evgenii Sterkhov Lubov Cherepanova Denis Yagodin Nikolay Chtchelkatchev Nikolay Dubinin Sergey Uporov |
| author_sort | Roman Ryltsev |
| collection | DOAJ |
| description | One of the intriguing recent results in the field of high-entropy alloys is the discovery of single-phase equiatomic multi-component Laves intermetallics. However, there is no clear understanding that a combination of chemical elements will form such high-entropy compounds. Here we contribute to understanding this issue by modifying the composition of duodenary TiZrHfNbVCrMoMnFeCoNiAl (12x) alloy in which we recently reported the fabrication of hexagonal C14 Laves phase. We consider three alloys based on 12x: 7x = 12x-VCrMoMnFe, 12x + Sc, 12x + Be and observe that all of them crystalize with the formation of C14 Laves phase as a dominant structure. We report that 12x + Be alloy reveals a single-phase C14 structure with a very high concentration of structural defects and ultra-fine dendritic microstructure with an almost homogenous distribution of the constituted elements over the alloy matrix. The analysis of electrical and magnetic properties reveals that the Laves phases are Curie-Weiss paramagnets, which demonstrate metallic conduction; 7x and 12x alloys also reveal a pronounced Kondo-like anomaly. Analysis of experimental data as well as <i>ab initio</i> calculations suggest that chemical complexity and compositional disorder cause strong <i>s-d</i> band scattering and thus the rather high density of <i>d</i>-states in the conduction band. |
| first_indexed | 2024-03-10T03:33:52Z |
| format | Article |
| id | doaj.art-0cc971a8c33b42559a6ee1fd143f8034 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-10T03:33:52Z |
| publishDate | 2021-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-0cc971a8c33b42559a6ee1fd143f80342023-11-23T09:33:32ZengMDPI AGMetals2075-47012021-12-011112196210.3390/met11121962Laves Phase Formation in High Entropy AlloysRoman Ryltsev0Vasiliy Gaviko1Svetlana Estemirova2Evgenii Sterkhov3Lubov Cherepanova4Denis Yagodin5Nikolay Chtchelkatchev6Nikolay Dubinin7Sergey Uporov8Institute of Metallurgy, Ural Branch of Russian Academy of Sciences, Amundsena Street 101, 620016 Ekaterinburg, RussiaUral Federal University, Mira Street 19, 620002 Ekaterinburg, RussiaInstitute of Metallurgy, Ural Branch of Russian Academy of Sciences, Amundsena Street 101, 620016 Ekaterinburg, RussiaInstitute of Metallurgy, Ural Branch of Russian Academy of Sciences, Amundsena Street 101, 620016 Ekaterinburg, RussiaInstitute of Metallurgy, Ural Branch of Russian Academy of Sciences, Amundsena Street 101, 620016 Ekaterinburg, RussiaInstitute of Metallurgy, Ural Branch of Russian Academy of Sciences, Amundsena Street 101, 620016 Ekaterinburg, RussiaVereshchagin Institute for High Pressure Physics, Russian Academy of Sciences, 108840 Troitsk, Moscow, RussiaInstitute of Metallurgy, Ural Branch of Russian Academy of Sciences, Amundsena Street 101, 620016 Ekaterinburg, RussiaInstitute of Metallurgy, Ural Branch of Russian Academy of Sciences, Amundsena Street 101, 620016 Ekaterinburg, RussiaOne of the intriguing recent results in the field of high-entropy alloys is the discovery of single-phase equiatomic multi-component Laves intermetallics. However, there is no clear understanding that a combination of chemical elements will form such high-entropy compounds. Here we contribute to understanding this issue by modifying the composition of duodenary TiZrHfNbVCrMoMnFeCoNiAl (12x) alloy in which we recently reported the fabrication of hexagonal C14 Laves phase. We consider three alloys based on 12x: 7x = 12x-VCrMoMnFe, 12x + Sc, 12x + Be and observe that all of them crystalize with the formation of C14 Laves phase as a dominant structure. We report that 12x + Be alloy reveals a single-phase C14 structure with a very high concentration of structural defects and ultra-fine dendritic microstructure with an almost homogenous distribution of the constituted elements over the alloy matrix. The analysis of electrical and magnetic properties reveals that the Laves phases are Curie-Weiss paramagnets, which demonstrate metallic conduction; 7x and 12x alloys also reveal a pronounced Kondo-like anomaly. Analysis of experimental data as well as <i>ab initio</i> calculations suggest that chemical complexity and compositional disorder cause strong <i>s-d</i> band scattering and thus the rather high density of <i>d</i>-states in the conduction band.https://www.mdpi.com/2075-4701/11/12/1962high-entropy alloylaves phasemicrostructureelectrical conductivitymagnetizationdensity of states |
| spellingShingle | Roman Ryltsev Vasiliy Gaviko Svetlana Estemirova Evgenii Sterkhov Lubov Cherepanova Denis Yagodin Nikolay Chtchelkatchev Nikolay Dubinin Sergey Uporov Laves Phase Formation in High Entropy Alloys Metals high-entropy alloy laves phase microstructure electrical conductivity magnetization density of states |
| title | Laves Phase Formation in High Entropy Alloys |
| title_full | Laves Phase Formation in High Entropy Alloys |
| title_fullStr | Laves Phase Formation in High Entropy Alloys |
| title_full_unstemmed | Laves Phase Formation in High Entropy Alloys |
| title_short | Laves Phase Formation in High Entropy Alloys |
| title_sort | laves phase formation in high entropy alloys |
| topic | high-entropy alloy laves phase microstructure electrical conductivity magnetization density of states |
| url | https://www.mdpi.com/2075-4701/11/12/1962 |
| work_keys_str_mv | AT romanryltsev lavesphaseformationinhighentropyalloys AT vasiliygaviko lavesphaseformationinhighentropyalloys AT svetlanaestemirova lavesphaseformationinhighentropyalloys AT evgeniisterkhov lavesphaseformationinhighentropyalloys AT lubovcherepanova lavesphaseformationinhighentropyalloys AT denisyagodin lavesphaseformationinhighentropyalloys AT nikolaychtchelkatchev lavesphaseformationinhighentropyalloys AT nikolaydubinin lavesphaseformationinhighentropyalloys AT sergeyuporov lavesphaseformationinhighentropyalloys |