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采用激光合金化法在Q235钢表面制备FexCoCrAlCu(x=0,0.5,1,2)高熵合金涂层。利用X射线衍射仪(XRD)、电子显微镜(SEM)、能谱仪(EDS)和显微硬度计对激光合金化层的相结构、显微组织、化学成分和硬度进行分析。结果表明,不同Fe含量的FexCoCrAlCu/Q235高熵合金化涂层均为具有简单体心立方(BCC)结构的固溶体,合金化层与基体间呈良好的冶金结合,显微组织为典型的枝晶组织,固溶体组织中出现了成分偏析现象。激光合金化层的显微硬度远高于基材Q235钢,且随着Fe主元含量的增加,涂层显微硬度呈下降趋势。FexCoCrAlCu/Q235激光高熵合金化层由表面至基材体系的混合熵呈高熵-中熵-低熵梯度变化。
A FexCoCrAlCu (x = 0,0.5,1,2) high-entropy alloy coating was prepared on Q235 steel by laser alloying. The phase structure, microstructure, chemical composition and hardness of laser alloying layer were analyzed by X-ray diffraction (XRD), electron microscope (SEM), energy dispersive spectrometer (EDS) and microhardness tester. The results show that the FexCoCrAlCu / Q235 high entropy alloy coatings with different Fe content are all solid solutions with a simple body-centered cubic (BCC) structure. The metallurgical bond between the alloyed layer and the substrate is good, and the microstructure is typical dendrite Tissue, solid solution composition segregation phenomenon. The microhardness of the laser alloying layer is much higher than that of Q235 steel. With the increase of Fe content, the microhardness of the coating decreases. The mixed entropy of FexCoCrAlCu / Q235 laser high entropy alloyed layer from the surface to the substrate system showed high entropy - medium entropy - low entropy gradient changes.