中国科学院材料磨损与防护重点实验室/先进润滑与防护材料研究发展中心知识库

In this paper, the phase diagram of (VNbTaMoW)0.5Cx (0 < x < 0.6) was first calculated. We establish the
complete phase diagram in two spatial dimensions from analysis the statistics of order phase parameters. To
obtain high-entropy carbides and validate the calculated results, a series of (VNbTaMoW)C were sintered at
different temperature. The single-phase carbide of (VNbTaMoW)C were synthesized at 1800 ◦C, which is higher
than the theoretically calculated temperature in phase diagram. The reason is that the estimated temperature was
calculated by mixing entropy for experimentally reported ideal solid solution models that simplified the temperature dependent parameters. Phase composition of (VNbTaMoW)C sintered at/below 1800 ◦C agrees well
with the calculation results in phase diagram. Furthermore, we have systematically investigated the single-phase
formation ability of four-metal and three-metal composition based on five elements (V, Nb, Ta, Mo, W). A total of
5 types of four-metal compositions and 10 types of three-metal compositions can be generated. However, for each
composition, only 4 kinds four-metal and 6 kinds three-metal compositions can form single phase carbides. Those
as-prepared single-phase carbides exhibit enhanced mechanical properties compared to the calculated values
according to the rule of mixtures from constituent monocarbides