铬含量对FeNiMnCuCrx系高熵合金微观结构和电化学性能的影响

摘要

采用了X射线衍射(XRD)、扫描电子显微镜(SEM)、X射线能谱(EDS)和电化学等方法,研究了铬含量对FeNiMnCuCrx系高熵合金微观结构、显微组织和电化学性能的影响.结果表明:FeNiMnCuCrx系高熵合金均为简单面心立方(FCC)固溶体结构,并且随着铬的添加,合金相结构由一套FCC相向两套FCC相转变,显微组织由柱状树枝晶向等轴树枝晶转变,并且合金的显微组织发生了一定程度的细化;随着铬的添加,FeNiMnCuCrx系高熵合金的自腐蚀电流密度呈现先增加后降低的趋势;在x=1时,FeNiMnCuCrx系高熵合金的自腐蚀电流密度最低,为7.8167×10-7 A/cm2.%The effects of Cr content on the variation of phase structure,microstructure and electrochemical properties of FeNiMnCuCrx high-entropy alloys were investigated by X-ray diffraction (XRD),scanning electron microscope (SEM),energy dispersive spectrometer (EDS) and electrochemical testing.The results showed that the alloys were FCC phase;the phase structure turned from single set of FCC to double sets of FCC with the increase of Cr.The microstructure transformed from columnar dendrites to equiaxed dendrites when the Cr content increased,and the microstructure refined.With the addition of Cr,the free corrosion current density showed the tendency of increasing first and decreasing afterwards.When ax was equal to 1,the corrosion current density showed the lowest value of 7.8167×10-7 A/cm2.