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采用水冷铜坩埚真空感应悬浮熔炼制备了多组元高熵合金Al0.5Co Cr Cu Fe Ni,研究了不同热处理工艺对合金的显微组织和硬度的影响规律。结果表明,Al0.5Co Cr Cu Fe Ni高熵合金相结构简单,在铸态下由两种不同成分的FCC相组成,枝晶处为贫Cu的FCC1相,枝晶间为富Cu的FCC2相,显微组织为树枝晶形貌,存在一定的枝晶偏析。合金制备态的硬度为255 HV0.5。合金具有良好的热稳定性,随着热处理温度的升高,合金的相结构和硬度均无太大的变化。冷却方式对合金的显微组织和相结构影响不大,但炉冷后合金的硬度比空冷和水冷时高。
The multi-element high-entropy alloy Al0.5Co Cr Cu Fe Ni was prepared by vacuum induction suspension melting in a water-cooled copper crucible. The effects of different heat treatment processes on the microstructure and hardness of the alloy were studied. The results show that the phase structure of Al0.5Co Cr Cu Fe Ni high entropy alloy is simple and consists of FCC phase with two different compositions in the as-cast state. The dendrite phase is the FCC1 phase which is poor in Cu and the Cu2 phase in the dendrite phase is Cu , The dendrite morphology of the microstructure, there is a certain dendritic segregation. Alloy prepared state hardness of 255 HV0.5. Alloy has good thermal stability, with the heat treatment temperature, alloy phase structure and hardness are not much changed. The cooling mode has little effect on the microstructure and phase structure of the alloy, but the hardness of the alloy after furnace cooling is higher than that of air cooling and water cooling.