FORMATION OF A SINGLE ALPHA-FE NANOPHASE DURING MECHANICALLY DRIVEN CRYSTALLIZATION OF AN FEMOSIB METALLIC-GLASS

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