Interstitial oxygen plays an important role in the microstructure and mechanical properties of recently developed refractory high-entropy or complex concentrated alloys. However, the mechanical properties of the oxygen-doped complex concentrated refractory alloy over a wide temperature range remain unclear. In this work, the effect of interstitial oxygen on the mechanical behavior of TiZrNb medium-entropy alloys (MEAs) has been investigated. At room temperature (RT), the interstitial oxygen improves the yield strength and tensile ductility owing to interstitial solid-solution strengthening and strain-hardening enhancement. However, simultaneous improvement of the RT strength-ductility by adding interstitial oxygen comes at the expense of increasing the ductile-brittle transition temperature (DBTT). Furthermore, the high-temperature yield strength of TiZrNb alloy can be improved up to 800 °C with the addition of 2 at% oxygen. The results above provide valuable insight into the mechanical properties of TiZrNb MEA, which would contribute to optimizing the high-performance refractory complex concentrated alloys in various applications.

中文翻译：

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间隙氧对TiZrNb中熵合金宽温度范围力学性能的影响

间隙氧在最近开发的难熔高熵或复杂浓缩合金的微观结构和机械性能中起着重要作用。然而，掺氧复合高熔点耐火合金在宽温度范围内的机械性能仍不清楚。在这项工作中，研究了间隙氧对 TiZrNb 中熵合金 (MEA) 机械行为的影响。在室温（RT）下，间隙氧由于间隙固溶强化和应变硬化增强而提高了屈服强度和拉伸延展性。然而，通过添加间隙氧同时提高 RT 强度-延展性是以提高延性-脆性转变温度 (DBTT) 为代价的。此外，添加2 at%的氧后，TiZrNb合金的高温屈服强度可提高至800℃。上述结果为了解 TiZrNb MEA 的机械性能提供了宝贵的见解，这将有助于优化各种应用中的高性能难熔复合浓缩合金。