Effect of Cooling Rate on Magnetic Properties of FeCoNi(CuAl)<SUB>0.8</SUB> High Entropy Alloy

The solidification process of an alloy has a significant influence on its microstructure and properties. In this article, the effect of cooling rate on the microstructure and magnetic properties of the FeCoNi(CuAl)SUB0.8/SUB high entropy alloys (HEAs) was investigated. Results showed that all the samples prepared at different cooling rates exhibited a duplex-phase structure of face-centered cubic (FCC) plus body-centered cubic (BCC). But the volume fraction of BCC and stacking density of the alloy increased with the increasing of cooling rate, leading to an increase in saturated magnetization. Furthermore, microstructure investigation showed that with the increasing of cooling rate, the grain size of the samples decreased, lattice distortion and residual stress increased, and more nanoprecipitates were embedded in the interdendritic phases of the sample, which may be responsible for the increase in coercivity of the alloy.