Abstract
Amorphous bulk materials of an Nd 14Fe 80B 6 alloy (25 mm in diameter and 20 mm in thickness) were produced by dynamic compaction of amorphous melt-spun ribbons. The amorphous bulk materials were successfully hot deformed by die upsetting. Die upsetting of the amorphous bulk materials resulted in crystallization, leading to fine Nd 2Fe 14B particles with polygonal shape. X-ray diffraction and magnetic measurements confirmed that the polygonal Nd 2Fe 14B grains were crystallographically aligned. The Nd 14Fe 80B 6 die upset magnets showed excellent value of the maximum energy products, exceeding 400 kJ m −3.
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