Abstract
Magnetic properties, phase evolution, and microstructure of directly quenched Nd y Fe 97− y− z Ti 3− x Zr x B z ( x = 0–3; y = 7–10; z = 14–19) bulk magnets of 0.9 mm in diameter have been investigated. Proper Zr substitution for Ti and appropriate Nd and B contents modify the magnetic phases constitution and refine the grain size from 200–250 nm to 50–100 nm. Consequently, the magnetic properties of the rods are enhanced remarkably from i H c = 6.2 kOe and (BH) max = 5.6 MGOe for Zr-free rods to i H c = 6.7–13.5 kOe and (BH) max = 6.7–8.2 MGOe for Zr-substituted Nd y Fe 97− y− z Ti 3− x Zr x B z rods ( x = 0.5–2; y = 8–10; z = 14–16). The optimum magnetic properties of B r = 6.6 kG, i H c = 9.6 kOe and (BH) max = 8.2 MGOe were achieved for Nd 9.5Fe 72.5Ti 2.5Zr 0.5B 15 alloy.
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