The effect of single-crystal rate growth of YUNDK35T5 alloy on the pha
se composition, cellular-dendritic structure and substructure perfecti
on has been studied. An increase of the growth rate has been shown to
cause an increase of disorientation angle for the alloy single crystal
s. The development of new technologies for production of single crysta
ls requires prediction of growing structures specifying chemical and p
hysical inhomogeneity of alpha-solid solution. An increase of growth r
ate for single crystals on the basis of Fe-Co-Ni-Al system is one of t
he urgent actual problems of production of permanent magnets.