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Influence of microstructure on localisation of deformation in Nickel-Based superalloys

Influence of microstructure on localisation of deformation in Nickel-Based superalloys

Student :  Joseph Rangel

PI: Hector Basoalto

The project focuses on the mechanics leading to the localisation of deformation during high temperature fatigue of nickel-based superalloys.  Understanding the mechanisms responsible for such localisation are key in the understanding of the development of damage and initiation of cracks under fatigue loading conditions.  The project will require the development of multi-scale modelling approaches that deal with the heterogeneous nature of the plastic deformation within grains through a crystal plasticity approach. In-situ experiments will be carried out to observe localised slip whilst varying key parameters which influence fatigue, for example y’ volume fraction, y’ particle size and grain size. Further simulations will then be carried out, where the parameters for the simulation matrix confer with those from the in-situ experiments. Then a comparison will be drawn between the in-situ measurements and model.  The results of this comparison can then be used to adjust the model to fine tune model simulations of localisation mechanisms in cyclic fatigue.

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