Revealing different corrosion behaviors of Cr-containing refractory high-entropy alloy coatings in static liquid lead–bismuth eutectic

• DOI: 10.1016/j.matdes.2024.113192
• Publication Date: 2024-07-27T22:12:43Z
• Authors: Jiuguo Deng; Wei Zhang; Xi Qiu; Mingyang Zhou; Yi Zhou; Ning Liu; Jijun Yang
• Keywords: Diffusion; Corrosion behavior; TA401-492; Refractory high-entropy alloy coating; Lead-bismuth eutectic; 02 engineering and technology; 0210 nano-technology; Materials of engineering and construction. Mechanics of materials

Five Cr-containing refractory high-entropy alloy (RHEA) coatings were prepared by magnetron sputtering technology and then exposed to static lead–bismuth eutectic to investigate their oxidation resistances at 550–650 °C. The obtained TiNbCrMoV coating had a BCC crystalline structure, while the others were amorphous. The TiNbCrMoV coating exhibited the best corrosion resistance, followed by TiNbZrCrV and CrNbZrMoV coatings, and finally TiCrZrMoV and TiNbZrMoCr coatings. The excellent corrosion resistance of TiNbCrMoV coating was mainly attributed to the presence of grain boundaries which provided the diffusion channels of atoms, thus forming a protective oxide layer. Possible mechanisms were proposed to help understand the corrosion behaviors of these RHEA coatings.