EFFECTS OF ANNEALING TEMPERATURE ON THE MICROSTRUCTURE AND INITIAL PERMEABILITY OF NANOCRYSTALLINE ALLOY FE-73.5 CU1MO3SI13.5B9

The effects of annealing temperature on the microstructure and initial permeability of nanocrystalline alloy Fe73.5Cu1Mo3Si13.5B9 have been investigated using x-ray diffraction (XRD) and transmission election m icroscopy (TEM) in this paper, In the annealing temperature range of 4 60-540 degrees C, the crystalline phase in the nanocrystalline alloy F e73.5Cu1Mo3Si13.5B9 is the alpha-Fe(Si) with a DO3 superstructure, and it has a grain size of similar to 14 nm, The volume fraction, Si cont ent, and degree of order of the alpha-Fe(Si) phase increase with incre asing the annealing temperature. The DO3 ordered region in the alpha-F e(Si) grain is approximately spherical; its size increases as the anne aling temperature increases. There is an obvious change in the microst ructure of the residual amorphous phase with the annealing temperature . Both the microstructure of the alpha-Fe(Si) phase and that of the re sidual amorphous phase have effects on the initial permeability of nan ocrystalline alloy Fe73.5Cu1Mo3Si13.5B9.