Abstract
The effects of Zr/Ti substitution for Fe on the magnetic properties, phase evolution and microstructure of directly quenched Nd9·5Fe72·5Ti3−xZrxB15 (x = 0–3) bulk magnets with 0·9 mm diameter have been investigated. Proper Zr substitution for Ti has been found to well modify the phase constitution and refine the grain size from 200–250 to 50–100 nm. Consequently, the magnetic properties of the rods are enhanced remarkably from iHc = 6·2 kOe and (BH)max = 5·6 MGOe for Zr free rods to iHc = 9·2–13·5 kOe and (BH)max = 6·9–8·2 MGOe for Zr substituted Nd9·5Fe72·5Ti3−xZrxB15 rods (x = 0·5–2). The optimum magnetic properties of Br = 6·6 kG, iHc = 9·6 kOe and (BH)max = 8·2 MGOe can be achieved for the directly cast Nd9·5Fe72·5Ti2·5Zr0·5B15 alloy.
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