Abstract
Doping 1 wt% Al89.5Cu9.7Fe0.8 alloy promotes the phase separation of Nd13.53Fe74.89Co5.54B6.04 alloy, forming the unique microstructure of small Nd-rich particles embedded in the large equiaxed Al-Cu-Fe-rich grains with the same Nd2Fe14B-type structure. Low-temperature annealing at 650 °C–710 °C improves the disorder degree of Nd2Fe14B-type phases and reduces the composition difference between different phases. Correspondingly, the large amorphous regions reduce to ∼20 nm small particles, and the small amorphous regions are crystallized into nanoclusters or nanoparticles. When the annealing temperature exceeds 750 °C, the grain composition is thoroughly homogenized, and the grains begin to overgrow. Al-Cu-Fe addition improves the thermal stability of some Fe-rich amorphous particles and makes them difficult to crystallize. Compared to the as-spun ribbons, annealing at 710 °C increased the coercivity by 72%, the remanence by 34%, and the maximum magnetization by 2.0%. At the same time, the corresponding microstructure evolution models are established.
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