Bulk high-entropy nitrides and carbonitrides
High-entropy ceramics have potential to improve the mechanical properties and high-temperature stability over traditional ceramics, and high entropy nitrides and carbonitrides (HENs and HECNs) are particularly attractive for high temperature and high hardness applications. The synthesis of 5 bulk HE...
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| Veröffentlicht in: | Scientific reports 2020-12, Vol.10 (1), p.21288-21288, Article 21288 |
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| creator | Dippo, Olivia F. Mesgarzadeh, Neda Harrington, Tyler J. Schrader, Grant D. Vecchio, Kenneth S. |
| description | High-entropy ceramics have potential to improve the mechanical properties and high-temperature stability over traditional ceramics, and high entropy nitrides and carbonitrides (HENs and HECNs) are particularly attractive for high temperature and high hardness applications. The synthesis of 5 bulk HENs and 4 bulk HECNs forming single-phase materials is reported herein among 11 samples prepared. The hardness of HENs and HECNs increased by an average of 22% and 39%, respectively, over the rule-of-mixtures average of their monocarbide and mononitride precursors. Similarly, elastic modulus values increased by an average of 17% in nitrides and 31% in carbonitrides over their rule-of-mixtures values. The enhancement in mechanical properties is tied to an increase in the configurational entropy and a decrease in the valence electron concentration, providing parameters for tuning mechanical properties of high-entropy ceramics. |
| doi_str_mv | 10.1038/s41598-020-78175-8 |
| format | Article |
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The synthesis of 5 bulk HENs and 4 bulk HECNs forming single-phase materials is reported herein among 11 samples prepared. The hardness of HENs and HECNs increased by an average of 22% and 39%, respectively, over the rule-of-mixtures average of their monocarbide and mononitride precursors. Similarly, elastic modulus values increased by an average of 17% in nitrides and 31% in carbonitrides over their rule-of-mixtures values. The enhancement in mechanical properties is tied to an increase in the configurational entropy and a decrease in the valence electron concentration, providing parameters for tuning mechanical properties of high-entropy ceramics.</abstract><cop>London</cop><pub>Nature Publishing Group UK</pub><pmid>33277546</pmid><doi>10.1038/s41598-020-78175-8</doi><tpages>1</tpages><oa>free_for_read</oa></addata></record> |
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| subjects | 639/301 639/301/1023 639/301/1023/1024 Ceramics Entropy Hardness High temperature Humanities and Social Sciences Mechanical properties multidisciplinary Science Science (multidisciplinary) |
| title | Bulk high-entropy nitrides and carbonitrides |
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