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In this paper we report an investigation of the mechanically driven nanocrystallization of a Fe77.2Mo0.8Si9B13 metallic glass during ball milling. TEM, XRD and DSC measurements indicated that after milling for 135 h, the amorphous sample crystallizes completely into a single alpha-Fe supersaturated solid solution with a mean grain size of about 6 nm, which is fundamentally different from the thermally induced crystallization products, as well as those of the mechanical crystallization reported in the literature (an alpha-Fe and borides). The as-crystallized nanophase sample milled for 262 h was found to exhibit an intrinsic thermal stability and no phase separation process was detected, even at 1173 K.