Abstract
Negative creep, i.e., slight and temporary contraction of the sample after loading in tension, is often observed in some superalloys at high temperatures and low uniaxial stresses along directions. This paradoxical effect seems to contradict the first principle of thermodynamics, since the specimen deforms for a while against the applied load. Any physically acceptable explanation should assume that this deformation results from a decrease of the internal energy of the system larger than the work done by the external stress. Even so, the phenomenon is still puzzling since this negative creep seems to be started by the application of the opposite external stress. In the model proposed here, the release of internal energy is assumed to be related to stress-induced directional coarsening of precipitates, the main features of which are first recalled. The model is then detailed, and the consequences discussed.
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