Modelling of mechanical behavior of nickel alloy using a thermodynamics approach to continuous media relaxation

The high-temperature behaviour of a Nickel alloy submitted to uniaxial tens ion, relaxation and creep, is analysed using a thermodynamics approach to n on-linear relaxations. The model is essentially based on a distribution of the dissipation processes obtained by the theory of fluctuations. The agree ment between experiment and simulations requires the use of four parameters . These parameters depend on the elastic properties of the alloy and also o n the thermal activation necessary for mobility defects. We present a compa rison. with the classical model of Chaboche including a recovery term in th e potential of dissipation. (C) Academie des Sciences/Elsevier, Paris.