The oxidation of refractory compositionally complex alloys (RCCAs) is one of the most critical subjects for their high temperature applications. In this work, several RCCAs were systematically designed and isothermally oxidised at 1000 °C for up to 24 h; the elemental effects of Al, Cr, Mo, Nb Ta, Ti, V, and Zr on the oxidation of the RCCAs were studied. It was found that Al, Cr, Ti could enhance the oxidation resistance of the RCCAs by promoting the formation of rutile-type AlTaO₄, CrTaO₄, and their related oxides, while Zr and V formed non-protective oxides such as Nb₂Zr₆O₁₇, Ta₂Zr₆O₁₇, ZrTiO₄, and VTa₉O₂₅, resulting in severe internal oxidation. Mo appeared to be effective in suppressing internal oxidation, but it could form non-protective MoTiTa₈O₂₅. Ta was slightly more beneficial than Nb for reducing the oxidation mass gain. This study provides insights on the elemental effects on the oxidation and guidelines for improving the oxidation resistance of RCCAs.

耐火成分复杂合金 (RCCA) 的氧化是其高温应用中最关键的课题之一。在这项工作中，系统地设计了几个 RCCA，并在 1000°C 下等温氧化长达 24 小时；研究了 Al、Cr、Mo、Nb Ta、Ti、V 和 Zr 元素对 RCCAs 氧化的影响。研究发现Al、Cr、Ti可以通过促进金红石型AlTaO ₄、CrTaO ₄及其相关氧化物的形成来提高RCCA的抗氧化性，而Zr和V形成Nb ₂ Zr等非保护性氧化物。 ₆ O ₁₇、Ta ₂ Zr ₆ O ₁₇、ZrTiO ₄、VTa₉ O ₂₅，导致严重的内氧化。Mo在抑制内部氧化方面似乎是有效的，但它可以形成非保护性的MoTiTa ₈ O ₂₅。在降低氧化质量增益方面，Ta 比 Nb 稍微更有利。本研究提供了有关元素对氧化的影响以及提高 RCCA 抗氧化性的指南的见解。