Modelling of recovery controlled creep in nickel-base superalloy single crystals
- Academy of Sciences of the Czech Republic, Brno (Czech Republic). Inst. of Physics of Materials
A model of the kinetics of recovery controlled creep in {l_angle}001{r_angle} oriented nickel-base superalloy single crystals has been developed. Two basic deformation mechanisms have been considered, namely (1) deformation of {gamma} channels by slip in discrete slip systems connected with the generation of dislocations and their deposition at the {gamma}/{gamma}{prime} interfaces; and (2) dynamic recovery of the dislocation structure due to non-conservative motion (a combination of slip and climb) of dislocations along the {gamma}/{gamma}{prime} interfaces and their annihilation. The climb of dislocations is conditioned by the diffusive transport of vacancies generated and annihilated at the climbing dislocations. In the steady-state creep the rate of the slip deformation in all the {gamma} channels is in equilibrium with the recovery induced diffusional deformation. The model predicts realistic values of the steady-state creep rates and their dependence on the applied stress, as well as the strains corresponding to the end of the primary creep stage, dislocation densities at the {gamma}/{gamma}{prime} interfaces and resolved shear stresses both in the {gamma} channels and in the {gamma}{prime} particles.
- OSTI ID:
- 445329
- Journal Information:
- Acta Materialia, Journal Name: Acta Materialia Journal Issue: 1 Vol. 45; ISSN 1359-6454; ISSN ACMAFD
- Country of Publication:
- United States
- Language:
- English
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