The simultaneous enhancement of magnetic and mechanical properties is desirable but challenging for soft-magnetic materials. A fabrication strategy to meet this requirement is therefore in high demand. Herein, bulk equiatomic dual-phase AlCoFeMnNi high-entropy alloys were fabricated via a magnetic levitation induction melting and casting process followed by annealing at 700–1000 °C, and their microstructures as well as mechanical and magnetic properties were investigated. The as-cast alloy possessed a single metastable B2-ordered solid solution that decomposed upon annealing into a dual-phase structure comprising an Al- and Ni-rich body-centered cubic (BCC) matrix and Fe- and Mn-rich face-centered cubic (FCC) precipitates both in the grain interior and along the grain boundaries. The magnetic and mechanical properties were closely related to the relative volume fraction of FCC in the alloy. The FCC volume fraction could be increased by increasing the annealing temperature, thereby offering tunable properties. The optimal annealing temperature for balanced magnetic and mechanical properties was found to be 800 °C. The alloy annealed at this temperature had an average BCC grain size of 12 ± 3 μm and FCC volume fraction of 41 ± 4%. Correspondingly, the saturation magnetization and coercivity reached 82.57 Am²/kg and 433 A/m, respectively. The compressive yield strength and fracture strength were 1022 and 2539 MPa, respectively, and the plasticity was 33%. Owing to its adjustable microstructure and properties, the AlCoFeMnNi alloy has potential for use as a multi-functional soft-magnetic material.

中文翻译：

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退火诱导双相组织的软磁高熵AlCoFeMnNi合金

磁性和机械性能的同时增强是期望的，但是对于软磁材料而言是挑战。因此，对满足这种要求的制造策略提出了很高的要求。在此，通过磁悬浮感应熔炼和铸造工艺，然后在700–1000°C进行退火，制备了块状等原子双相AlCoFeMnNi高熵合金，并研究了它们的微观结构以及机械和磁性能。铸态合金具有单一的亚稳态B2级固溶体，该固溶体在退火后分解成双相结构，该双相结构包括富铝和富镍的体心立方（BCC）基体以及富铁和富锰的面心立方晶（FCC）在晶粒内部和沿晶界析出。磁性和机械性能与合金中FCC的相对体积分数密切相关。可以通过提高退火温度来增加FCC体积分数，从而提供可调的性能。发现平衡磁性和机械性能的最佳退火温度为800°C。在此温度下退火的合金的平均BCC晶粒度为12±3μm，FCC体积分数为41±4％。相应地，饱和磁化强度和矫顽力达到82.57 Am 在此温度下退火的合金的平均BCC晶粒度为12±3μm，FCC体积分数为41±4％。相应地，饱和磁化强度和矫顽力达到82.57 Am 在此温度下退火的合金的平均BCC晶粒度为12±3μm，FCC体积分数为41±4％。相应地，饱和磁化强度和矫顽力达到82.57 Am² / kg和433 A / m。压缩屈服强度和断裂强度分别为1022和2539 MPa，可塑性为33％。由于其可调节的微观结构和性能，AlCoFeMnNi合金具有用作多功能软磁材料的潜力。