In this work, we examined the microstructure evolution, as well as the micromechanical and magnetic properties of FeCoNiAlSi high-entropy alloys (HEAs) under high pressure solidification (HPS). According to the results, FeCoNiAlSi alloy solidified at 0.1 MPa (atmospheric pressure) contains three kinds of phases: grain boundary (GB)phases, peritectic phases, and primary phases. As the solidification pressure increases to 7 GPa, the volume fraction of GB phases and peritectic phases decreases, while the volume fraction of primary phase increases by 82.8%. In addition, the Fe of the primary phase increases by 63.6%, which enhances the ferromagnetism and exchange coupling properties of the alloy. Furthermore, HPS also reduces the magneto-crystal anisotropy of the GB phases and the pinning effect of boundaries on domain movement. Additionally, with the increasing solidification pressure, the FeCoNiAlSi HEAs shows stronger ferromagnetic. When solidified at 7Gpa, a reduction of 51.5% in intrinsic coercivity(H_MC) was observed, as was an increase of 106% in magnetic polarization strength (Js). As well, HPS significantly increased the high temperature magnetic properties of FeCoNiAlSi alloy as well as the microhardness(i.e. from 8.25 GPa to 10.15 GPa). According to these results, HPS is an effective method for developing new functional applications for FeCoNiAlSi HEAs.

在这项工作中，我们研究了高压凝固 (HPS) 下 FeCoNiAlSi 高熵合金 (HEAs) 的微观结构演变以及微观机械和磁性能。结果表明，在 0.1 MPa（大气压）下凝固的 FeCoNiAlSi 合金 包含三种相：晶界（GB）相、包晶相和初生相。随着凝固压力增加到7 GPa，GB相和包晶相的体积分数减小，而初生相的体积分数增加了82.8%。此外，初生相的Fe增加了63.6%，增强了合金的铁磁性和交换耦合性能。此外，HPS 还降低了 GB 相的磁晶各向异性和边界对畴运动的钉扎效应。此外，随着凝固压力的增加，FeCoNiAlSi HEAs 表现出更强的铁磁性。当以 7Gpa 凝固时，观察到固有矫顽力 (H _MC ) 降低了 51.5%，磁极化强度 (Js) 增加了 106%。此外，HPS 显着提高了 FeCoNiAlSi 合金的高温磁性能以及显微硬度（即从 8.25 GPa 至 10.15  GPa)。根据这些结果，HPS 是开发 FeCoNiAlSi HEA 新功能应用的有效方法。