An equiatomic FeS iB AlN i amorphous high-entropy alloy(HEA) was fabricated by mechanical alloying(MA). A fully amorphous phase was obtained in the FeS iB AlN i HEA after 240 h of MA. The bulk FeS iB AlN i samples were sintered by spark plasma sintering(SPS) at 520 and 1080°C under a pressure of 80 MPa. The sample sintered at 520°C exhibited an amorphous composite structure comprising solid-solution phases(body-centered cubic(bcc) and face-centered cubic(fcc) phases). When the as-milled amorphous HEA was consolidated at 1080°C, another fcc phase appeared and the amorphous phase disappeared. The sample sintered by SPS at 1080°C exhibited a slightly higher melting temperature compared with those of the as-milled alloy and the bulk sample sintered at 520°C. The corrosion behaviors of the as-sintered samples were investigated by potentiodynamic polarization measurements and immersion tests in seawater solution. The results showed that the HEA obtained by SPS at 1080°C exhibited better corrosion resistance than that obtained by SPS at 520°C. A fully amorphous phase was obtained in the FeS iB AlN i HEA after 240 h of MA. The bulk FeS iB AlN i samples were sintered by spark plasma sintering (SPS) at 520 and 1080 ° C under a pressure of 80 MPa. The sample sintered at 520 ° C exhibited an amorphous composite structure comprising solid-solution phases (body-centered cubic (bcc) and face-centered When the as-milled amorphous HEA was consolidated at 1080 ° C, another fcc phase appeared and the amorphous phase disappeared. The sample sintered by SPS at 1080 ° C exhibited a slightly higher melting temperature compared with those of the as-milled alloy and the bulk sample sintered at 520 ° C. The corrosion behaviors of the as-sintered samples were investigated by potentiodynamic polarization measurements and immersion tests in seawater solution. The results showed that the HEA obtained by SPS at 1080 ° C exhibited bette r corrosion resistance than that obtained by SPS at 520 ° C.