期刊
ACTA MATERIALIA
卷 197, 期 -, 页码 20-27出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2020.07.003
关键词
High temperature oxidation; High entropy alloys; Ultra-high temperature ceramics; High entropy carbides; High entropy borides; Refractory
资金
- U.S. Office of Naval Research MURI program [N00014-15-1-2863]
- Virginia Space Grant Consortium Graduate Research Fellowship [200009-010]
High entropy materials, which include high entropy alloys, carbides, and borides, are a topic of substantial research interest due to the possibility of a large number of new material compositions that could fill gaps in application needs. There is a current need for materials exhibiting high temperature stability, particularly oxidation resistance. A systematic understanding of the oxidation behavior in high entropy materials is therefore required. Prior work notes large differences in the thermodynamic favorability between oxides formed upon oxidation of high entropy materials. This work uses both analytical and computational thermodynamic approaches to investigate and quantify the effects of this large variation and the resulting potential for preferential component oxidation in refractory high entropy materials including group IV-, V- and VI-element based alloys and ceramics. Thermodynamic calculations show that a large tendency towards preferential oxidation is expected in these materials, even for elements whose oxides exhibit a small difference in thermodynamic favorability. The effect is reduced in carbides, compared to their alloy counterparts. Further, preferential oxidation in high entropy refractory materials could result in possible destabilization of the solid solution or formation of other, competing phases, with corresponding changes in bulk material properties. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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