Nanocrystallization of Fe-Nb(-Zr)-B-Al amorphous alloys

摘要

The crystallization behavior of Fe_83.5Nb_7B_8.5Al, and Fe_85.5Nb_4Zr_4B_5.5Al_1 amorphous alloys was studied by differential thermal analysis, transmission electron microscopy and X-ray diffractometry. The formation of single bcc nanophase in the first alloy was preceded by the appearance of an intermediate stage containing the ε-NbB_2 phase. In the second alloy the precipitation of intermetallic phases occurred without any change in the grain size of bcc α-Fe.