THE EFFECTS OF TI, C, AND TIC ON THE CRYSTALLIZATION OF AMORPHOUS ND2FE14B

The effects of Ti, C, and TiC on the crystallization of amorphous Nd2F e14B have been investigated. Through the selection of appropriate allo ying additions the as-crystallized energy product can be significantly increased. Two factors are attributed to this increase. First, by dis solution of the additions into the glass the intrinsic properties of t he glass are altered, resulting in an increase in the crystallization temperature of some alloys. Since the nucleation rate has an Arrehnius temperature dependence more nuclei per unit time should result in a f iner and more uniform grain size. Secondly, stable carbide and boride phases may serve as inoculation sites promoting uniform nucleation. In order to obtain high as-crystallized energy products, the alloying ad ditions should have very low equilibrium solubilities in the 2-14-1 ph ase and must not cause an overall reduction in the amount of hard magn etic phase or cause the formation of other soft magnetic phases.