We report the evolution of nanocrystalline α-Fe and γ-Ni phases in (Ni_xFe_1-x)_70.5B_17.7Si_7.8Ti₄ (at.%) where, x = 0.3 and 0.4, upon mechanical alloying of elemental powder mixtures up to 36 h. The effect of milling time on the nanostructure evolution, thermal stability, and magnetic properties have been investigated throughly using x-ray diffraction (XRD), differential scanning calorimetry (DSC), and vibrating sample magnetometry (VSM). XRD analysis of the as-milled powders revealed that the lattice parameter and the crystallite size of α-Fe phase lies in between 0.2850-0.2972 nm and 3–14 nm; whereas the same for γ-Ni lies in between 0.3550-0.3608 nm and 8–41 nm, respectively, during milling. The thermal analysis of the as-milled powders suggests that the onset temperature of crystallization increases as Fe content decreases. The thermomagnetic measurement of the heat treated powders has revealed the T_C of α-Fe phase in x = 0.3 to be 590 K and that of γ-Ni phase in x = 0.4 to be 375 K. The maximum magnetic entropy change has been estimated to be 0.159 Jkg^-1K⁻¹ in x = 0.3, while that of x = 0.4 has been found to be 0.695 Jkg^-1K⁻¹ at an applied magnetic field of 19.9 kOe.

我们报告了(Ni _x Fe _{1- x} ) _70.5 B _17.7 Si _7.8 Ti ₄ (at.%) 中纳米晶α -Fe 和 γ-Ni 相的演变，其中x  = 0.3 和 0.4，对元素粉末混合物进行机械合金化长达 36 小时。使用X射线衍射（XRD）、差示扫描量热法（DSC）和振动样品磁强法（VSM）研究了球磨时间对纳米结构演化、热稳定性和磁性能的影响。研磨后的粉末的 XRD 分析表明，α的晶格参数和晶粒尺寸-Fe 相介于 0.2850-0.2972 nm 和 3-14 nm 之间；而在铣削过程中，γ-Ni 的相同值分别位于 0.3550-0.3608 nm 和 8-41 nm 之间。研磨后的粉末的热分析表明，随着 Fe 含量的降低，结晶开始温度升高。热处理粉末的热磁测量表明，x  = 0.3中α -Fe 相的T _C为590 K，x  = 0.4中 γ-Ni 相的T _C为375 K。 已估计最大磁熵变在x  = 0.3 时为 0.159 Jkg ^-1 K ^-1，而在x  = 0.4 时已发现为 0.695 Jkg ^-1 K^-1在 19.9 kOe 的外加磁场下。