Seminars and Events

Modeling precipitate-dislocation interactions in Ni-base superalloys

Date/Time: 15.09.2014. 3:45 p.m.
Place: Ruhr-Universität Bochum, Bochum, Germany

Yunzhi Wang, Department of Materials Science and Engineering, The Ohio State University, Columbus, USA

Because of the multitude of deformation mechanisms operative at service temperatures and the strong influence of microstructure on the deformation modes in Ni-base superalloys, development of predictive property models requires incorporation of specific deformation mechanisms operating in specific alloy systems under a given set of microstructure states and service conditions. In this presentation, we show the use of phase field method in combination with experimental characterization and ab initio calculations in an attempt to identify deformation mechanisms and quantify activation pathways of precipitate shearing in Ni-base superalloys. In particular, deformation mechanism maps are established based on the simulation results, which could be incorporated in crystal plasticity models. Effects of microstructural features beyond average particle size and volume fraction of precipitates, such as precipitate shape and spatial distribution, on mechanical properties are also quantified.

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