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利用XRD、SEM、EDS以及电化学极化曲线,研究不同含量Ni元素对铸态AlFeCoCrCuNix(x=0、0.25、0.5、1)多组元高熵合金的微观组织及电化学腐蚀性能的影响。结果表明,四种成分的合金均呈典型的树枝晶结构,组织中伴有成分偏析现象,其中Cu元素大量聚集于晶界。加入少量Ni元素使合金内部形成颗粒状Al-Ni第三相,且随着Ni含量的增加,颗粒状分布的Al-Ni相演变为聚集于富Cu晶界与枝晶之间的大块相。加入Ni使AlFeCoCrCuNix(x=0、0.25、0.5、1)合金在3.5%NaCl溶液中的耐腐蚀性能得到了提升,其中AlFeCoCrCuNi0.5的耐蚀性能最好。
The effects of Ni on the microstructure and electrochemical corrosion resistance of as-cast AlFeCoCrCuNix (x = 0,0.25,0.5,1) multi-element high-entropy alloys were investigated by XRD, SEM, EDS and electrochemical polarization curves. The results show that all four alloys have typical dendritic structure with segregation of components, of which Cu is abundant in the grain boundaries. Adding a small amount of Ni element to form a granular Al-Ni third phase inside the alloy, and with the increase of Ni content, the grain-like Al-Ni phase evolves into a bulk phase that accumulates between the Cu-rich grain boundary and the dendrite . The addition of Ni enhanced the corrosion resistance of AlFeCoCrCuNix (x = 0,0.25,0.5,1) alloy in 3.5% NaCl solution, and the corrosion resistance of AlFeCoCrCuNi0.5 was the best.