P. Allia et al., IMPROVED DUCTILITY OF NANOCRYSTALLINE FE73.5NB3CU1SI13.5B9 OBTAINED BY DIRECT-CURRENT JOULE HEATING, Applied physics letters, 63(20), 1993, pp. 2759-2761
Direct-current joule heating is exploited to reduce the brittleness of
ferromagnetic Fe73.5Nb3Cu1S13.5B9 nanocrystallized from the amorphous
state. An ordering process occurring before nanocrystallization is si
ngled out and shown to be responsible for sample embrittlement and mag
netic-permeability degradation. The process is partially avoided by pr
operly choosing the heating conditions. Nanocrystalline ribbon strips
having substantially higher ductility than furnace-annealed samples, a
nd maintaining excellent soft magnetic properties, are easily obtained
.