Evolution of the strain field during formation and dissolution of γ’’in a Ni superalloy at elevated temperatures

The excellent high temperature mechanical properties of Ni-base superalloys come from their microstructure composed of strengthening precipitates coherently embedded in a solid solution (FCC) matrix. Understanding the mechanisms governing the dissolution and the precipitation of the γ’ phase is therefore essential to predict the microstructural changes that can occur over its lifetime. In this proposal, we intend to image the evolution of the strain distribution associated to the formation and the dissolution of γ’ precipitates using scanning X-ray diffraction and Bragg ptychography.