STUDY OF CRYSTALLIZATION PROCESS OF METGLASS FE86B14 BY MOSSBAUER-EFFECT AND RESISTIVITY MEASUREMENTS

Both isochronal resistivity measurements and phase identification usin g Mossbauer effect in amorphous alloy Fe86B14, quenched at selected te mperatures from 300 to 925K, show three main stages. The slight rise i n resistivity in stage 1, 300 to 500k, may be because of gamma-FeB whi ch is the only phase which crystallizes in this stage. The decrease in resistivity in stage II, 550 to 735K therefore the formation of alpha -Fe, Fe2B and Fe3B. The appearance of a step in resistivity curve in t his stage, from 640 to 680K, can be attributed to gamma-FeB, whose per centage increases appriciably in the same interval of temperature. In stage III, 735 to 925K, where the crystallization seems to be complete , the sharp rise in resistivity may be because of lattice scattering o f electrons. In this stage alpha-Fe, gamma-FeB and Fe2B are present. g amma-FeB is the first phase to crystallize from the amorphous phase in stead of alpha-Fe as previously reported.