Abstract In this study, the mechanical and magnetic properties of FeCoNiAl0.25Mn0.25 high-entropy alloy (HEA) were investigated by subjecting as-cast samples to cold rolling and annealing at different temperatures for 1 h. The as-cast and cold rolled HEAs show a single-phase face-centered cubic (FCC) structure. The annealing temperature has a noteworthy influence on the phase composition and microstructure of the cold rolled HEA, and the microstructural evolution is described as follows: heterogeneous microstructure with a FCC matrix and body-centered cubic (BCC) precipitates (750 ℃ and 850 ℃) → recrystallized microstructure with FCC matrix and BCC precipitates (950 ℃) → coarse grains with a single FCC phase (1050 ℃). Though the HEA annealed at 1050 ℃ has the best ductility and lowest coercivity, the yield strength is very low. A good combination of ductility and strength is found in the sample annealed at 850 ℃ (CR+HEA-850), whose microstructure is comprised of BCC precipitates, recrystallized FCC equiaxed grains and a few FCC hard-deformed lamellae. The heterogeneous structure of the CR+HEA-850 resulted in a strong back stress, which contributes to its good mechanical properties. The high yield strength came from the grain refinement, dislocation strengthening, Orowan effect, and twin boundaries. Additionally, its soft magnetic properties are also appealing, showing high saturated magnetization (112.4 emu/g) and good coercivity (8.7 Oe). Compared with the HEAs on other conditions in this study and those previously reported, the CR+HEA-850 displays an interesting combination of magnetic and mechanical performance, which offers a strategy towards a new generation of multifunctional high-entropy alloys.

中文翻译：

---

通过冷轧和退火处理同步微调 FeCoNiAl0.25Mn0.25 高熵合金的机械和磁性能

摘要 在这项研究中，通过对铸态样品进行冷轧和不同温度退火 1 h 来研究 FeCoNiAl0.25Mn0.25 高熵合金 (HEA) 的机械和磁性能。铸态和冷轧 HEA 显示出单相面心立方 (FCC) 结构。退火温度对冷轧HEA的相组成和显微组织有显着影响，显微组织演变描述如下：具有FCC基体和体心立方（BCC）析出物的异质组织（750℃和850℃） →具有FCC基体和BCC析出物的再结晶组织（950℃）→具有单一FCC相的粗晶（1050℃）。1050℃退火的HEA虽然具有最好的延展性和最低的矫顽力，但屈服强度很低。850 ℃退火的样品（CR+HEA-850）具有良好的延展性和强度组合，其显微组织由BCC析出物、再结晶的FCC等轴晶和少量FCC硬变形薄片组成。CR+HEA-850 的异质结构导致强大的背应力，这有助于其良好的机械性能。高屈服强度来自晶粒细化、位错强化、Orowan 效应和孪晶界。此外，其软磁特性也很吸引人，显示出高饱和磁化强度 (112.4 emu/g) 和良好的矫顽力 (8.7 Oe)。与本研究中其他条件下的 HEA 和先前报道的 HEA 相比，CR+HEA-850 显示出有趣的磁性和机械性能组合，