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A preferential precipitation sequence of metastable phase formation during crystallization of an amorphous alloy (Fe0.99Mo0.01)(78)Si9B13 was revealed as following: alpha-Fe(Si, Mo) (bcc) --> (Fe,Mo)(3)B (BCT), (Fe,Mo)(3.0)B (BCT), and (Fe,Mo)(23)B-6 (fcc) --> Fe2B. An ordering process of atom cluster occurs prior to the crystallization. Above experimental sequence of crystallization of (Fe0.99Mo0.01)(78)Si9B13 metallic glass could be understood in terms of the Gaskell model, There is a high strain (0.33%) in the alpha-Fe(Si, Mo) (bcc) grain with 37 nm, and the strain relaxation leads to the distortion in the lattice parameter of nanocrystallite. (C) 1996 American Institute of Physics.