EFFECT OF PARTIAL SUBSTITUTION OF IRON ATOMS BY Ti, Zr, Mo, Cr AND Cu ATOMS ON THE PROCESSES OF CRYSTALLIZATION OF RAPIDLY HARDENED RIBBONS OF ALLOYS OF THE Nd-Fe-B SYSTEM

摘要

The effect of substitution of iron atoms by atoms of alloying elements on the processes of crystallization of Nd_(9.5)Fe_(84.5)B_6 and Nd_(9.5)Fe_(84)B_6M_(0.5) alloys (M: Ti, Mo, Cu, Zr, Cr) obtained by rapid hardening from liquid state is analyzed. It is shown that rapid hardening followed by annealing yields a nanocrystalline structure in the studied alloys. The mean sizes of the nanocrystallites of phase Nd_2Fe_(14)B in the annealed condition as determined by analyzing the broadening of lines on diffractograms range from 30 + 3 nm (in the Nd_(9.5)Fe_(84)B_6M_(0.5) alloy) to 60 ± 6 nm (in the Nd_(9.5)Fe_(84.5)B_6 alloy).