Development of a technique for 3D grain reconstruction of fine grained structures via nano diffraction : Implementation of nano grain mapping at the PETRA III beamline P03
Understanding the microstructure of materials is crucial in many research fields, from aerospace engineering to energy production. The mechanical, thermal, and electrical properties of polycrystalline materials are strongly influenced by their internal grain structures. 3D X-Ray Diffraction (3DXRD) microscopy allows for non-destructive investigation of polycrystalline materials.This technique is of great importance in materials science, as understanding grain size, orientation, and distribution is crucial for predicting material properties and performance. However, the resolution of these methods is inherently limited by factors such as beam size, detector pixel size, and the precision of the rotation stage used during measurements. This dissertation addresses the development and implementation of a technique for three-dimensional grain structure analysis of nano-grained polycrystalline materials. This technique was specifically developed for the beamline P03 at the PETRA III synchrotron radiation source to enable a high-precision and spatially resolved characterization of micro- and nanostructures in materials. The focus of the work is on the detailed development of the experimental setup, which allows the acquisition of 3D datasets of grain structures using hard X-rays. The setup includes components for precise alignment and rotation of samples, which enable high-resolution analysis of complex polycrystalline structures. Major challenges included achieving reliable rotation with high precision for the measurements and preparing the measurement data to ensure a successful reconstruction. The results of the first successful measurements are presented, confirming the functionality and precision of the developed system. It has been demonstrated that the developed setup provides detailed insights into the grain structure of polycrystalline materials, which were previously only achievable with destructive methods.
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