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Niobium and Molybdenum as Alloying Constituents in Al0.3CoCrFeNi to Develop Eutectic High-Entropy Alloys for HVOF Spraying
Journal of Thermal Spray Technology ( IF 3.2 ) Pub Date : 2022-07-14 , DOI: 10.1007/s11666-022-01417-w
B. Preuß , T. Lindner , T. Uhlig , G. Wagner , T. Lampke

The addition of refractory metals represents a promising approach for development of future high-entropy alloys (HEAs). Niobium and molybdenum are particularly suitable additives for increasing hardness as well as wear and corrosion resistance. In the context of surface protection applications, eutectic high-entropy alloys (EHEAs) with their homogeneous property profile are of specific interest. In the present work, two EHEAs were developed starting from the alloy Al0.3CoCrFeNi using electric arc melting. Following mechanical and microstructural characterization, the two alloys were found to have the compositions Al0.3CoCrFeNiMo0.75 and Al0.3CoCrFeNiNb0.5. For thermal spray processing, powders of the above alloys were prepared by inert gas atomization. The coatings produced by high-velocity oxy-fuel spraying (HVOF) were characterized and evaluated compared with castings, allowing process–structure–property relationships to be derived. Based on the results, statements on possible application potential can be made.



中文翻译:

铌钼作为 Al0.3CoCrFeNi 合金成分开发用于 HVOF 喷涂的共晶高熵合金

添加难熔金属代表了开发未来高熵合金(HEAs)的一种有前途的方法。铌和钼是特别合适的添加剂,用于增加硬度以及耐磨性和耐腐蚀性。在表面保护应用的背景下,具有均匀性能分布的共晶高熵合金 (EHEA) 受到特别关注。在目前的工作中,使用电弧熔化从合金 Al 0.3 CoCrFeNi 开始开发了两种 EHEA。在进行机械和微观结构表征后,发现这两种合金的成分为 Al 0.3 CoCrFeNiMo 0.75和 Al 0.3 CoCrFeNiNb 0.5. 对于热喷涂处理,上述合金的粉末通过惰性气体雾化制备。与铸件相比,对高速氧燃料喷涂 (HVOF) 产生的涂层进行了表征和评估,从而得出工艺-结构-性能关系。根据结果​​,可以就可能的应用潜力做出陈述。

更新日期:2022-07-15
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