Abstract
The activation energy and the activation volume for diffusion-controlled high-temperature creep were measured by the change-of-slope method. The values obtained were: 9.7±0.4 kcal/g-atom (or 0.42 eV) and 25.2±0.5 cc/g-atom (0.55 atomic volumes); this value of the activation volume is at 1 kbar. From this the value at atmospheric pressure can be estimated to be 26.0 cc/g-atom. It can be assumed that the activation energy and activation volume for self-diffusion are given closely by these creep values inasmuch as the strain rates used were small (ε̇∼10−7 sec−1) and the temperatures were relatively high (T∼0.9TM).
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