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利用真空电弧熔炼法制备了AlFeCrCoNiMo高熵合金。用X射线衍射(XRD)、扫描电镜(SEM)、硬度仪,研究了退火对高熵合金的微观组织及硬度的影响。结果表明:铸态以及退火后的合金是树枝晶结构,枝晶间是由Cr_9Mo_(21)Ni_(20)和NiCoCr金属间化合物组成的共晶结构;随着退火温度的升高,FCC相逐渐减少,并会析出新的金属间化合物;合金的微观应力表现出先增大后减少的变化趋势;合金的硬度随着退火温度的升高先升高再降低,合金的应力与硬度的变化趋势一致,当退火温度达到800℃时,合金的硬度达到最大。
AlFeCrCoNiMo high entropy alloy was prepared by vacuum arc melting method. The effects of annealing on the microstructure and hardness of high-entropy alloys were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and hardness tester. The results show that the as-cast and as-annealed alloys are dendritic structures and the interdendritic structures are eutectic structures consisting of intermetallic Cr9Mo_ (21) Ni_ (20) and NiCoCr. With the increase of annealing temperature, the FCC phase gradually increases Decrease and precipitation of new intermetallic compounds; the micro-stress of the alloy shows the trend of first increase and then decrease; the hardness of the alloy first increases and then decreases with the increase of annealing temperature, the change trend of the stress and hardness of the alloy is the same, when Annealing temperature reached 800 ℃, the hardness of the alloy to achieve the maximum.