CHARACTERIZATION OF MECHANICAL NANOCRYSTALLIZATION PROCESS OF AMORPHOUS FE-MO-SI-B ALLOY BY TRANSMISSION MOSSBAUER-SPECTROSCOPY

The nanocrystallization process of the amorphous Fe-Mo-Si-B alloy unde r ball milling is characterized by means of transmission Mossbauer emi ssion spectroscopy (TMES) in the present paper. It was found that a si ngle alpha-Fe phase with the bcc structure is formed under ball-millin g the amorphous Fe-Mo-Si-B alloy. A significant increase in the relati ve area of the subspectra of 8Fenn and 7Fenn and a remarkable decrease in isomer shift and half linewidth of the subspectra of various Fe co nfigurations, especially in the case of 6Fenn, were observed during th e ball-milling process. The diffusion of metalloid atoms from the bcc alpha-Fe phase to the remaining amorphous phase and alpha-Fe/alpha-Fe grain boundaries is suggested to occur during the mechanical crystalli zation of the current amorphous alloy based on the above TMES investig ations.