Fe–6.5 Si–0.05 B alloy was used in the study to investigate the texture evolution and magnetic property of the ferromagnetic crystal under an axial high magnetic field during bulk solidification. Optical microscopy (OM) and X-ray diffraction (XRD) were applied to analyze the microstructures and texture evolution of the alloy solidified under different magnetic field intensities. The result shows that with an increase in the magnetic field intensity from 0 to 2 T, the texture gradually changes from random orientation to {100} 〈120〉, eventually becoming a mixture of cube and Goss texture. The alloys treated at 1 and 2 T showed magnetic anisotropic behavior, while the alloy treated at 0 T showed magnetic isotropic behavior. The change in magnetic property comes from the evolution of α-Fe crystal orientation. Furthermore, a method for controlling the crystallization process and crystallographic orientation by adjusting the magnetic field intensity was proposed.

We study the effects of Dy, Nb, and Ga additions on the microstructure and magnetic properties of Nd2Fe14B/α-Fe nanocomposites. Dy, Nb, and Ga additions inhibit the growth of the soft magnetic α-Fe phase. Dy and Nb additions are able to refine the microstructure, whereas Ga addition plays only a minor role in prohibiting crystal growth. The magnetic properties are sensitive to Dy, Nb, and Ga additions. The Dy-containing alloy enhances the intrinsic coercivity of 872 kA/m because Dy partially replaces Nd, forming (Nd, Dy)2Fe14B. Nb addition refines the microstructure, and consequently increases the exchange coupling between magnetic grains. The Nd9.5Fe75.4Co5Zr3B6.5Ga0.6 alloy exhibits the highest remanence (0.92 T) due to Ga addition.

The influence of substitution of Fe by Ni or Co on the glass forming ability (GFA) and soft magnetic properties of the Fe71−xNb6B23Nix (x = 1–5) and (Fe1−x−yNixCoy)71Nb6B23 (x = 0.1–0.2, y = 0.1–0.2) amorphous ribbons was systematically studied. The Ni or Co substitution for Fe enhances the GFA and decreases the thermal stability for Fe–Nb–B–Ni and (Fe, Ni, Co)–Nb–B alloy systems. The alloys with Ni and Co substitution have lower glass transition temperature and wider supercooled liquid region than that with Ni substitution. The (Fe0.7Ni0.1Co0.2)71Nb6B23 alloys achieved the maximum supercooled liquid region of 78 K. The saturation magnetization decreased and the coercivity increased with increasing Ni or Co content. The (Fe0.8Ni0.1Co0.1)71Nb6B23 amorphous ribbons exhibited the best soft magnetic properties with high saturation and low coercivity. The findings of Fe-based multicomponent alloys with large GFA, low cost, and good magnetic properties are encouraging to develop new soft magnetic materials.

In order to complete the research on the Fe–Se binary system, the phase structures with selenium contents from 50 to 60 at.% have been studied. Fe–Se binary samples used in this study were prepared by the high-temperature solid-state reaction method, and the phase structure of each sample was determined by powder X-ray diffraction. The solid solubility of the Fe3Se4 phase was determined to be from 56.1 to 57.6 at.% Se based on the values of unit-cell parameters. Magnetic properties of the samples were also studied.