Abstract
Magnetocrystalline anisotropy field (HA) is an internal factor for determining the coercivity (Hc) of the magnetic materials. Despite a theoretical HA of 73 kOe, the melt-spun Nd-Fe-B alloy achieves only 20 % of this value for Hc. Comparing Ho2Fe14B and Pr2Fe14B compounds with an identical HA of 75 kOe, we reveal that Ho-substituted Nd-Fe-B alloys exhibit a more pronounced Hc enhancement than Pr-substituted alloys. The Hc value of (Nd1-xPrx)-Fe-B alloy increased from 16.9 kOe (x = 0) to 20.7 kOe of x = 1.0 alloy, achieving 28 % of its HA value. Notably, the Ho-substituted alloys exhibited a significantly higher coercivity, reaching 28.0 kOe at x = 1.0 and establishing an impressive 38 % ratio to its HA. The coercivity of Ho-substituted alloys is controlled by both nucleation and pinning, whereas the Pr-substituted alloys follow a nucleation-type mechanism. Microstructure characterization shows Ho substitution has a positive effect on grain refinement. Furthermore, Ho tends to concentrate in the RE2Fe14B grains, leading to an increased HA of the main phase and a substantial rise in Hc.
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