FeCoNiCr_xMn (x = 0.0, 0.6, 0.8, 1.0) high-entropy alloys (HEAs) were prepared by a 3D high-energy ball-milling method. The phase structure, grain size, crystallinity, morphology, static magnetic properties, corrosion resistance, oxidation resistance and electromagnetic properties of FeCoNiCr_xMn HEAs are investigated in detail by modulating Cr contents. FeCoNiCr_xMn HEAs had the phase transformation from FCC to BCC with the increase of Cr contents, which caused abnormal change of both static magnetic properties and corrosion resistance. The introduction of Cr is beneficial to improve the corrosion resistance and oxidation resistance of the alloys. In addition, FeCoNiCr_xMn HEAs had excellent electromagnetic-wave absorption performances. The minimum reflection loss (RL_min) of FeCoNiCr_0.6Mn reached -66.9 dB at 4.9 GHz with a thickness of 2.8 mm, and FeCoNiCr_0.8Mn had the RL_min of -57.4 dB at 5.2 GHz with a thickness of 3.3 mm. This study shows that FeCoNiCr_xMn HEAs have practical application prospect due to the excellent electromagnetic-wave absorbing performances and great harsh-environment resistance.

采用 3D 高能球磨法制备FeCoNiCr _{x Mn (x = 0.0, 0.6, 0.8, 1.0) 高熵合金 (HEAs)。}通过调节 Cr 含量，详细研究了 FeCoNiCr _x Mn HEA 的相结构、晶粒尺寸、结晶度、形貌、静磁性能、耐腐蚀性、抗氧化性和电磁性能。随着 Cr 含量的增加， FeCoNiCr _x Mn HEAs 发生了从 FCC 到 BCC 的相变，导致静磁性能和耐腐蚀性的异常变化。Cr的引入有利于提高合金的耐蚀性和抗氧化性。此外，FeCoNiCr _xMn HEAs 具有优异的电磁波吸收性能。_{FeCoNiCr 0.6} Mn的最小反射损耗（RL _min）在 4.9 GHz 时达到 -66.9 dB，厚度为 2.8 mm，而 FeCoNiCr _0.8 Mn在 5.2 GHz 时的 RL _min为 -57.4 dB，厚度为 3.3 mm。该研究表明，FeCoNiCr _x Mn HEAs 具有优异的电磁波吸收性能和良好的抗恶劣环境能力，具有实际应用前景。