【摘要】 采用X射线衍射仪、光学显微镜、扫描电子显微镜和材料力学试验机研究了经1 100℃×24 h和1 200℃×24 h退火处理的CoCrFeMnNiC_0.10高熵合金的晶体结构、微观组织和力学性能。结果表明：铸态CoCrFeMnNiC_0.10高熵合金为单相FCC结构，树枝晶组织，不同温度退火后有Cr₇C₃碳化物析出。与1 100℃×24 h退火合金相比，1 200℃×24 h退火合金中Cr₇C₃碳化物数量明显减少。与铸态合金相比，1 100℃×24 h退火合金的均匀延伸率下降了67.3%,屈服强度提高了50%,而1 200℃×24 h退火合金的均匀延伸率略有下降，但屈服强度提升了60%。更多还原

【Abstract】 Crystal structure, microstructure and mechanical properties of CoCrFeMnNiC_0.10 high entropy alloy annealed at 1 100 ℃ for 24 h and 1 200 ℃ for 24 h were studied by means of X-ray diffractometer, optical microscope, scanning electron microscope and material mechanics tester. The results showed that the as-cast CoCrFeMnNiC_0.10 high entropy alloy obtained a single-phase FCC dendrite structure, and Cr₇C₃ carbides were precipitated after annealing at different temperatures. Compared with the alloy annealed at 1 100 ℃for 24 h, the amount of Cr₇C₃ carbides in the alloy annealed at 1 200 ℃ for 24 h was significantly reduced. Compared with the as-cast alloy, the uniform elongation of the alloy annealed at 1 200 ℃ for 24 h decreased by 67.3% and the yield strength increased by 50%; the uniform elongation of the alloy annealed at 1 200 ℃ for 24 h decreased slightly, but the yield strength increased by 60%.更多还原