Crystallization in Fe_(76)X_2B_(22) (X = Cr, Zr, Nb) amorphous alloys

摘要

In the present paper crystallization in the Fe_(76)X_2B_(22) (X = Cr, Zr, Nb) amorphous alloys was examined by applying different experimental techniques (resistivity measurements, differential scanning calorimetry and X-ray diffraction). It was shown that alloying additions cause a slowing down of the diffusion processes which manifests in a shift of the nanocrystallization process into higher temperatures. This effect is discussed in the context of soft magnetic properties of examined materials. Activation enthalpy of crystallization determined from the DSC data strongly depends on alloying additions and is: 2.1, 2.1, 2.7 and 4.0eV for Fe_(78)B_(22), Fe_(76)Cr_2B_(22), Fe_(76)Zr_2B_(22), Fe_(76)Nb_2B_(22) alloys, respectively. The crystallization phenomenon in examined alloys proceeds via formation of rape nanograins (nanocrystallization for Fe_(76)Zr_2B_(22) and Fe_(76)Nb_2B_(22)) and the growth of ctFe nanograins plus formation of boride Fe_3B.