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研究了偏析元素Al、Ni的含量对Al Co Cr Fe Ni Ti0.5高熵合金组织结构的影响。采用XRD和SEM对该合金的组织进行了检测,分析了混合熵、混合焓、原子半径差、平均价电子浓度变化与组织结构变化的影响规律。结果表明:Al元素含量减小,合金中析出了FCC相,且合金组织形貌影受响明显;Ni元素含量减小,合金中BCC相衍射峰的强度增大;Al、Ni元素含量同时降低,合金中析出了σ相等金属间化合物相,且合金硬度增大。
The effects of segregation elements Al and Ni on the microstructure of Al-Co-Cr-Fe-Ni-Ti0.5 high-entropy alloys were studied. The microstructure of the alloy was investigated by XRD and SEM. The influence laws of the entropy, enthalpy of mixing, difference of atomic radius, average valence electron density and the change of microstructure were analyzed. The results show that the content of Al decreases and the FCC phase precipitates in the alloy, and the microstructure of the alloy is obviously affected. The content of Ni decreases and the intensity of diffraction peak of BCC phase increases. The content of Al and Ni decreases , The alloy is precipitated σ equivalent intermetallic compound phase, and the alloy hardness increases.