Abstract High-entropy alloys with a superalloy-like microstructure show excellent mechanical properties at elevated temperatures. In this paper, a multi-phase high-entropy alloy CrMnFeCoNiAl0.75 was developed. Based on the microstructure characterization by XRD, SEM, TEM and 3D-APT, it was found that the alloy was composed of FCC phase, BCC phase, and B2 phase. The mechanical properties evaluation showed that the alloy had high compression yield strength of 1194 MPa at room temperature and could preserve high yield strength of 1070 MPa at 500 °C. Further increase in the temperature beyond 600 °C resulted in alloy softening. The alloy showed limited strain of 2.72% at room temperature, but it exhibited adequate deformability at elevated temperatures up to 500 °C (strain >20%). The strengthening mechanisms of the alloy at different temperatures were discussed.

中文翻译：

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中温高强度多相CrMnFeCoNiAl0.75高熵合金

摘要 具有类似高温合金微观结构的高熵合金在高温下表现出优异的机械性能。在本文中，开发了一种多相高熵合金 CrMnFeCoNiAl0.75。基于XRD、SEM、TEM和3D-APT的显微组织表征，发现该合金由FCC相、BCC相和B2相组成。力学性能评价表明，该合金在室温下具有 1194 MPa 的高压缩屈服强度，在 500 ℃下仍能保持 1070 MPa 的高屈服强度。温度进一步升高超过 600 °C 导致合金软化。该合金在室温下表现出 2.72% 的有限应变，但在高达 500°C 的高温下（应变 >20%）表现出足够的变形能力。