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First principles calculations were performed in Co3AlxW1−x to estimate fault energies, elastic constants and parameters determining the thermodynamic viability and kinetics of yield anomaly. These parameters predict the occurrence of yield anomaly, but only for a limited range of compositions. The driving force for cross-slip resulting in sessile dislocation configurations and cube slip is lower in...
It has been recently shown that microtwinning is the principal deformation mechanism under certain creep conditions in several polycrystalline nickel-base superalloys. A creep model based on this mechanism is developed in this paper. Model parameters, supplied by microscopy and by atomistic calculations, are used to compare the model against experiment.
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