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The present work exhibits the effects of Sn addition on the magnetic properties and microstructure of FeCoNi(CuAl) 0.8 Sn  x  (0 ≤ x ≤ 0.10) high-entropy alloys (HEAs). The results show all the samples consist of a mixed structure of face-centered-cubic (FCC) phase and body-centered-cubic (BCC) phase. The addition of Sn promotes the formation of BCC phase, and it also affects the shape of Cu-rich nano-precipitates in BCC matrix. It also shows that the Curie temperatures ( T c  ) of the FCC phase and the saturation magnetization ( M s  ) of the FeCoNi(CuAl) 0.8 Sn  x  (0 ≤ x ≤ 0.10) HEAs increase greatly while the remanence ( B r  ) decreases after the addition of Sn into FeCoNi(CuAl) 0.8 HEA. The thermomagnetic curves indicate that the phases of the FeCoNi(CuAl) 0.8 Sn  x  (0 ≤ x ≤ 0.10) HEAs will transform from FCC with low T c  to BCC phase with high T c  at temperature of 600-700 K. This work provides a new idea for FeCoNi(CuAl) 0.8 Sn  x  (0 ≤ x ≤ 0.10) HEAs for their potential application as soft magnets to be used at high temperatures.

Magnetic Properties and Microstructure of FeCoNi(CuAl)0.8Snx (0 ≤ x ≤ 0.10) High-Entropy Alloys