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

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.