A 3D Analysis of Dendritic Solidification and Mosaicity in Ni-Based Single Crystal Superalloys.

ABSTRACT: Ni-based single crystal superalloys contain microstructural regions that are separated by low-angle grain boundaries. This gives rise to the phenomenon of mosaicity. In the literature, this type of defect has been associated with the deformation of dendrites during Bridgman solidification. The present study introduces a novel serial sectioning method that allows to rationalize mosaicity on the basis of spatial dendrite growth. Optical wide-field micrographs were taken from a series of cross sections and evaluated using quantitative image analysis. This allowed to explore the growth directions of close to 2500 dendrites in a large specimen volume of approximately 450 mm³. The application of tomography in combination with the rotation vector base-line electron back-scatter diffrac

SUBMITTER: Scholz F 

PROVIDER: S-EPMC8432729 | biostudies-literature | 2021 Aug

REPOSITORIES: biostudies-literature