Nanostructured Ni₂MnCo alloy samples were prepared from pure elemental powders by Mechanical Alloying (MA) using a high-energy planetary ball mill. The obtained powders were characterized with XRD, SEM, laser diffraction granulometry and VSM techniques in order to study the microstructural, morphology, particle size distribution and magnetic properties as a function of milling time. The XRD patterns of as-milled powders revealed the formation of the main stage solid solution of Ni₂MnCo with fcc structure phase after 24 h of MA. With increasing milling time from 0.5 hr to 50 hr, it is observed that the lattice parameter increases from 3.60 to 3.78 Å as well as an increase of microstrain from 0.17 to 0.41%, whereas the particle and crystallite size decreases down to 3.50 µm and 13 nm respectively. The mixture loses magnetization during the milling process due to the combined effects of crystallites size reduction and the dissolution of the antiferromagnetic compound (Mn) within the host lattice of the alloy. The very low values of the remanence ratio (Mr/Ms) ([1.2E-3, 1.7E-3]), as well as the very low values of the coercive field (≈ 1 Oe), were observed after 16 h of milling, which means that the alloy is magnetically saturated exhibiting a very soft magnetic behavior.

使用高能行星球磨机通过机械合金化 (MA) 从纯元素粉末制备纳米结构的 Ni ₂ MnCo 合金样品。用 XRD、SEM、激光衍射粒度仪和 VSM 技术对获得的粉末进行表征，以研究作为研磨时间函数的微观结构、形态、粒度分布和磁性。研磨后的粉末的 XRD 谱揭示了 Ni ₂主阶段固溶体的形成MA 24 小时后具有 fcc 结构相的 MnCo。随着研磨时间从 0.5 小时增加到 50 小时，观察到晶格参数从 3.60 增加到 3.78 Å 以及微应变从 0.17 增加到 0.41%，而颗粒和微晶尺寸减小到 3.50 µm 和 13纳米分别。由于微晶尺寸减小和合金主晶格内反铁磁化合物 (Mn) 溶解的综合影响，混合物在研磨过程中失去磁化。在 16 小时后观察到非常低的剩磁比 (Mr/Ms) ([1.2E-3, 1.7E-3]) 值以及非常低的矫顽场值 (≈ 1 Oe)。铣削，这意味着合金磁饱和，表现出非常软的磁性能。