Abstract We evaluated the suitability of Fe40Co30Ni30 as a precursor for Fe-rich FeCoNi-based high-entropy semi-hard magnets. Mechanically alloying the metal powders 40 at.% Fe, 30 at.% Co, and 30 at.% Ni for 12 h effected micron-size Fe40Co30Ni30 powder comprised of nanocrystalline γ phase. Fe40Co30Ni30 evinced semi-hard magnetic properties at room-temperature—saturation magnetization (MS) ~146 Am2/kg and intrinsic coercivity (HCI) ~4.30 kA/m—as well as at below-room-temperatures. The MS at 0 K, μH, and HCI at 0 K were estimated as ~155 Am2/kg, ~1.60 μB, and ~7 kA/m, respectively. Alloy powders after thermal-treatment exhibited tunable semi-hard magnetic behavior at below-room temperatures and room temperature; their magnetic properties were comparable to certain commercial semi-hard magnets. The weighted Euclidean distance-based approach of decision-making proposed the Fe-rich FeCoNi medium-entropy alloy—Fe40Co30Ni30—as a favorable precursor, having an optimal combination of properties, for designing and fabricating novel FeCoNi-based high-entropy semi-hard magnets.

中文翻译：

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评价 Fe40Co30Ni30 作为富铁 FeCoNi 基高熵半硬磁体前驱体的适用性

摘要 我们评估了 Fe40Co30Ni30 作为富铁 FeCoNi 基高熵半硬磁体前驱体的适用性。将 40 at.% Fe、30 at.% Co 和 30 at.% Ni 的金属粉末机械合金化 12 小时，实现了由纳米晶 γ 相组成的微米级 Fe40Co30Ni30 粉末。Fe40Co30Ni30 在室温下——饱和磁化强度 (MS) ~146 Am2/kg 和内禀矫顽力 (HCI) ~4.30 kA/m——以及低于室温下表现出半硬磁特性。0 K、μH 和 0 K HCl 的 MS 估计分别为~155 Am2/kg、~1.60 μB 和~7 kA/m。热处理后的合金粉末在低于室温和室温下表现出可调的半硬磁行为；它们的磁性可与某些商业半硬磁体相媲美。