The magnetic properties and the microstructure of Nd-Fe-B and Nd-Fe-Co-Ga-B
die upset magnets produced from amorphous materials were studied. The Nd-F
e-B die upset magnets had fine polygonal Nd2Fe14B grains and showed magneti
c anisotropy. The compositional modification and optimization of the die up
set condition led to the increase in the remanence and coercivity values of
the Nd-Fe-B die upset magnets. The optimally deformed Nd-Fe-Co-Ga-B die up
set magnets showed the maximum energy product of 54.4 MGOc. (C) 1998 Americ
an Institute of Physics. [S0021-8979(98)15011-9].