Microstructure and corrosion behaviour of AlCoFeNiTiZr high-entropy alloy films

ABSTRACT

Three kinds of AlCoFeNiTiZr high-entropy alloy films with different elements ratios were prepared using magnetron sputtering. The films were composed of fcc solid solution phases and amorphous phases with typical uniform polycrystal microstructure. The anticorrosion performances of the films were tested in a NaCl solution. The changes of microstructures and composition were quantitatively characterised by XPS, SEM and TEM. During the corrosion reaction process there was a decrease in the contents of Al, Ti, Zr and Fe elements. The increase in Fe-Co-Ni content lead to an increase of passivation area, and a subsequent increase in corrosion potential (E_corr) and a decrease in the corrosion current density (I_corr). A decrease in the crystal lattice distortion, vacancy, dislocation and grain boundary segregation was also noted increasing corrosion resistance. Additionally, both the grain refinement and the total grain boundary length in the film reduced, and as a result the corrosion resistance improved.

KEYWORDS:

• High-entropy alloy film
• corrosion performance
• microstructure
• magnetron sputtering
• amorphous

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This paper was financially supported by National Natural Science Foundation of China (NSFC 51535011, 51705095, 51775554, 51575118), National Basic Research Program of China (973 Program) (NO. 61328303), Postdoctoral scientific research developmental fund of Heilongjiang province (NO.LBH-Q18036), Fundamental Research Funds for the Central Universities (HEUCF) and Natural science foundation of heilongjiang province (NO.LH2019E031).