High strength NiMnFeCrAlCu multi-principal-element alloys with marine application perspective

Nickel-aluminium bronze (NAB) alloys are traditional marine materials used for decades, but face to the challenge of insufficient strength and corrosion properties. In this work, thanks to the strong solid solution strengthening, corrosion and biofouling resistant ability of multiple components, we developed novel NiMnFeCrAlCu multi-principal-element alloys (MPEAs), which exhibit excellent combination of mechanical and corrosion resistant properties. It was found that NiMnFe0.5Cr0.5Al0.2Cu1.2 MPEA has higher yield and ultimate tensile strength, and lower corrosion current density by one magnitude than those of NBA, and also shows a considerable copper ion release concentration. These merits are attributed to the dual phase of FCC+BCC, and the enrichment of Cu in the FCC matrix and Cr in the BCC grains. This work has implication in the new strategy for the development of advanced marine materials. (C) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Automated summary

Novel NiMnFeCrAlCu multi-principal-element alloys (MPEAs) were developed in this study, exhibiting excellent combination of mechanical and corrosion resistant properties, which has implications in the development of advanced marine materials.