Abstract
It is known that the structural relaxation in supercooled liquid and glassy metals exhibit a non-Debye type relaxation behavior and a VFT-like temperature dependence. Such behaviors are often characterized by the exponent of the Kohlrausch–Williams–Watts (KWW) function and by the value of the fragility. In the present work, a quantity N B which gives the number of structural units involved in the thermally activated viscous flow is introduced to characterize the bulk metallic glass-forming liquids. N B is defined from the Bond Strength – Coordination Number Fluctuation (BSCNF) model of the viscosity. It is shown that N B can be a new indicator that quantifies the degree of cooperativity within the bulk metallic glass-forming liquids. For several bulk metallic glass-forming liquids, it is shown that the characteristic temperature ratio T 0/ T g, N B, and the stretched exponent β KWW are mutually correlated through the fragility index m derived from the BSCNF model.
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