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)_0.8 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.