Effect of element substitution on nanostructure and hard magnetism of rapidly quenched Nd₂Fe₁₄B

Nanocrystalline and nanocomposite permanent magnets by melt spinning technique

“…Recently, Zhang et al reported that enhanced remanence and energy product could be achieved in Nb-substituted magnets if the microstructure are fine controlled in the meltspun ribbons. [223] Figure 28 [221] Therefore, a higher energy product is achieved in the Ti-substitution nanocomposites, although it accompanies a slightly lower coercivity. Zhang et al investigated the effect of Ti content on magnetic properties of Nd 9 Dy 0.4 Fe 81.24−x Ti x Nb 0.36 Co 3 B 6 ribbons and found that the coercivity and energy product increases from 0.74 T and 15.8 MGOe to 1.20 T and 21.9 MGOe, respectively.…”

“…ribbons spun at 15 m/s. [223] Other element substitutions Liu and Davis studied the substitution of Fe by Co and found that Co improves remanence, coercivity, and Curie temperature in certain concentration range. The 10-20 at.% Co substitution could lead to the best magnetic properties with µ 0 M r = 0.97 T and µ 0 H c = 0.55 T in the nanocomposite Nd 2 Fe 14 B/α-Fe alloys produced by melt spinning.…”

Ti‐Doped Nanocomposite Pr2Fe14B/α‐Fe Ribbons with High Coercivity

“…This limits the grains from expanding too large during the preparation process and maintains a fine grain structure. Smaller grain sizes can lead to higher coercivity [7,8] because the smaller grains can result in more grain boundaries, which can pin and impede the domain wall movement during the magnetization reversal process. During the preparation process, the distribution and quantity of titanium dopant can be precisely controlled to optimize the magnetic properties of the nanocomposite magnets.…”

“…In addition, element doping is regarded as one of the most effective methods for modifying the microstructure and improving the magnetic properties of melt‐spun nanocomposite ribbons. [ 7 ]…”

“…In addition, element doping is regarded as one of the most effective methods for modifying the microstructure and improving the magnetic properties of melt-spun nanocomposite ribbons. [7] Titanium is recognized as one of the most effective alloying elements for improving the magnetic properties and enhancing the resistance to corrosion in nanocomposite PMs. It has been found that adding Ti can increase the amount of amorphous hard phase and decrease that of soft magnetic phase and also improve the thermal stability of the annealed Nd-Fe-B ribbon.…”