According to a new bifurcation theory model for the glass transition proposed by the authors, the experimental non Debye relaxation law of the structural relaxation of metallic glasses below the glass transition temperature T g, i.e. (t) ～exp[-( t/τ ) β ], 0< β <1, is theoretically deduced, then, changes of internal friction of Fe 83 B 17 and Al 88.5 Y 6.5 Ni 5 amorphous alloys isothermally annealed at various temperatures below their glass transition temperatures were measured and the structural relaxation dynamics was experimentally studied. It is shown that the structural relaxation dynamics in terms of the internal friction accords with non Debye law and the experimental result agrees well with the theoretical analysis.
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