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基于激光熔覆铝合金表面制备AlFeCuNiCoCr高熵合金元素的析出特点，将原高熵合金中各元素相同的摩尔比进行调整，Al元素物质的量下调为0.5、Cu元素为0.7。通过显微组织、相结构以及等离子体的采集等，分析摩尔比对激光熔覆制备高熵合金的影响。结果表明：改变元素摩尔比后熔覆层与基体形成良好的冶金结合界面，尽管固溶强化效应有所降低，但有效改善了熔覆层的微观缺陷(如气孔和裂纹),同时显著抑制了熔覆过程中的飞溅行为；合金相结构与显微组织机构发生变化，熔覆层中形成了取向随机分布的针状枝晶组织，且晶粒尺寸分布较为均匀；顶部显微硬度有所提高，达到铝合金基底8倍以上且分布更加均匀，熔覆层厚度减小；由于改变后Co、Ni原子百分比提高，Cu偏析性减弱，钝化膜稳定性增强，合金耐腐蚀性能有所提高。
Abstract：Based on the precipitation characteristics of AlFeCuNiCoCr high-entropy alloy prepared by laser cladding on an aluminum alloy substrate, the original equimolar ratio of each element in the high-entropy alloy was adjusted, with the molar amount of Al reduced to 0.5 and that of Cu to 0.7. The influence of the molar ratio on the laser-clad high-entropy alloy was analyzed through microstructure, phase structure, and plasma emission spectroscopy. The results indicate that after adjusting the molar ratio of the elements, the cladding layer formed an ideal metallurgical bonding interface with the substrate. Although the solid solution strengthening effect was somewhat reduced, it effectively improved microscopic defects(pores and cracks) in the clad layer while significantly suppressing spattering behavior during the cladding process. The alloy phase structure and microstructural organization changed, resulting in randomly oriented needle-like dendritic structures within the cladding layer, with a relatively uniform grain size distribution. The microhardness at the top layer increased to more than eight times that of the aluminum alloy substrate and became more uniformly distributed, while the thickness of the cladding layer decreased. Furthermore, the elevated Co and Ni concentrations mitigate Cu segregation, thereby improving passive film stability and enhancing the alloy′s corrosion resistance.
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基本信息:
DOI：10.14128/j.cnki.al.20254512.001
中图分类号:TG139;TG665
引用信息:
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