High-performance AlCoCrFeNi high entropy alloy with marine application perspective

Abstract

2205 duplex stainless steel (DSS) and Incoloy 825 alloys are extensively utilized in the marine environment for decades but have some limitations of insufficient hardness and strength and poor wear resistance. Here, we developed AlCoCrFeNi high-entropy alloy (HEA), which showed a good combination of mechanical, wear-resistant and corrosion-resistant properties. Vickers hardness and compressive yield strength of AlCoCrFeNi HEA were ∼517.6 HV and ∼1306.4 MPa, respectively, which were much higher than those of 2205 DSS and Incoloy 825 alloys. Besides, there is a smaller wear rate and lower corrosion current density for AlCoCrFeNi HEA compared with those of 2205 DSS and Incoloy 825 alloys, suggesting good resistance to wear and corrosion damage. These merits are due to lattice distortion, high hardness and low grain boundary number per unit area. This work offers new insights for the development of wear- and corrosion-resistant HEA materials used in the marine environment.

Keywords

• AlCoCrFeNi high-entropy alloy
• Mechanical properties
• Wear resistance
• Corrosion resistance