碳含量对Al0.5Co0.5NiCrFe高熵合金涂层组织与性能的影响

doi:10.13251/j.issn.0254-6051.2022.03.026

摘要/Abstract

摘要： 使用氩弧熔覆制备不同碳含量Al_0.5Co_0.5NiCrFe高熵合金涂层,研究碳含量对Al_0.5Co_0.5NiCrFe高熵合金涂层组织与性能的影响。结果表明:碳加入后,高熵合金均由单一的FCC结构组成,并没有表征出其他物质,但根据高熵合金显微组织与能谱分析可以发现,高熵合金的枝晶间有碳铬化合物生成。高熵合金涂层的组织为典型的树枝晶结构,随着碳含量的增加,组织不断细化。随碳含量的增加,高熵合金涂层的硬度不断升高,当碳含量为4%时,硬度(383.2 HV0.5)和耐磨性均为最佳。随碳含量的不断增加,高熵合金的耐腐蚀性先增强后减弱,碳含量为2%时耐腐蚀性最佳。根据单位面积氧化增量,高熵合金的抗氧化性先增大后减小,当碳含量为2%时,抗氧化性最佳。

关键词: 高熵合金涂层, 耐磨性, 耐腐蚀性, 抗氧化性

Abstract: Al_0.5Co_0.5NiCrFe high-entropy alloy coatings with different carbon contents were prepared by argon arc cladding, and effect of carbon content on the microstructure and properties of the Al_0.5Co_0.5NiCrFe high-entropy alloy coating was studied. The results show that after the addition of carbon, the high-entropy alloys are all composed of a single FCC structure, and no other structure are characterized. However, according to the microstructure and energy spectrum analysis of the high-entropy alloy, it can be found that there is carbon and chromium between the dendrites of the high-entropy alloy. The microstructure of the high-entropy alloy coating is a typical dendritic structure, and the microstructure is continuously refined with the increase of carbon content. With the increase of carbon content, the hardness of high-entropy alloy coating increases continuously. When the carbon content is 4%, the highest hardness is 383.2 HV0.5, and the wear resistance is also the best. With the continuous increase of carbon content, the corrosion resistance of high-entropy alloy first increases and then weakens, and when the carbon content is 2%, corrosion resistance is the best. According to the oxidation mass gain per unit area, the oxidation resistance of the high-entropy alloy first increases and then decreases. When the carbon content is 2%, the coating has the best oxidation resistance.

Key words: high-entropy alloy coating, wear resistance, corrosion resistance, oxidation resistance

中图分类号:

TG174.4

时海芳, 李强. 碳含量对Al_0.5Co_0.5NiCrFe高熵合金涂层组织与性能的影响[J]. 金属热处理, 2022, 47(3): 136-141.

Shi Haifang, Li Qiang. Effect of carbon content on microstructure and properties of Al_0.5Co_0.5NiCrFe high-entropy alloy coating[J]. Heat Treatment of Metals, 2022, 47(3): 136-141.

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