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 under ball milling is characterized by means of transmission Mossbauer emission spectroscopy (TMES) in the present paper. It was found that a single alpha-Fe phase with the bcc structure is formed under ball-milling the amorphous Fe-Mo-Si-B alloy. A significant increase in the relative area of the subspectra of 8Fenn and 7Fenn and a remarkable decrease in isomer shift and half linewidth of the subspectra of various Fe configurations, especially in the case of 6Fenn, were observed during the 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 crystallization of the current amorphous alloy based on the above TMES investigations.