Deformation behavior of deeply embedded single grains in polycrystalline alloys during loading

The aim of this proposal is to map and understand the governing parameters of the deformation behavior of single grains embedded in polycrystalline alloys during the application of external load.

Model alloys representing both single-phase and multi-phase systems with an FCC phase that has different stacking fault energy will be investigated. Effect of parameters such as grain size, morphology, neighborhood and orientation will be investigated.

A non-destructive single grain mapping methodology called three-dimensional x-ray diffraction (3DXRD), will be applied to interrogate the deformation behavior of single grains deeply embedded in the bulk of the alloys during in-situ loading experiments.

Different loading conditions, including both quasi-static and cyclic loading will be applied, and the measurements will be supplemented by crystal plasticity modelling.

A better understanding of the governing parameters of single grain deformation behavior in polycrystalline alloys can provide better insights in strain-hardening, damage accumulation and failure for e.g. advanced steels, high-entropy alloys and superalloys.

The novel in-situ experiments will provide an experimental basis for the verification and refinement of the currently developed crystal plasticity models of polycrystalline deformation behavior.

The project will shed light on the microstructural changes that lead up to initiation of fracture at complex loading conditions that are of vast technical importance.