Abstract
Nd-Fe-B amorphous powders were produced by two different techniques; mechanical grinding and melt-spinning. These powders were dynamically compacted using gun method at shock pressures between 10GPa and 30GPa. When a shock pressure of 10GPa was applied, the powders were compacted into bulk form without loosing the amorphous state. The resultant bulk amorphous materials showed very low coercivities as same as the amorphous powders. On the other hand, crystallization occurred during dynamic compaction when the powders were shocked at relatively higher shock pressures. When a shock pressure of 20GPa was applied, the bulk material produced by using mechanical grinded powders had Nd2Fe14B ferromagnetic phase, but those produced by using melt-spun powders had a-Fe phase together with Nd2Fe14B phase.
