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For the investigation of structural relaxation near the glass transition quasistatic creep after-effect measurements have been performed on the alloy Zr 65 Cu 17:5 Ni 10 Al 7:5  which shows a large stability above the glass temperature  T  g . By a separation of anelastic local atomic rearrangements and viscous long-range diffusion processes the thermal activation parameters of both processes could be determined from Arrhenius diagrams. Below  T  g  = 606 K an activation enthalpy of 2.1 eV and above  T  g  an activation enthalpy of 5.6 eV has been determined. For a quantitative description of these relaxation phenomena a new dynamic model is developed which takes into account the continuous formation and annihilation of relaxation centers near  T  g . From measurements of the internal friction after rapid temperature changes it could be shown that extended relaxation centers present above  T  g  become instable below  T  g  and are split up by diffusion processes above 585 K, however, disappear spontaneously below 580 K.

Strain Relaxation and Internal Friction in the Range of the Glass Transition