As an example of using XRD-DIC, residual strain values along the central line in a Mg AZ31B alloy bar after 3-point bending are calculated by using both XRD-DIC and the conventional ‘caking’ with fitting procedures. A new method is proposed here that relies on direct Digital Image Correlation analysis of 2D X-ray powder diffraction patterns ( XRD-DIC, for short). The multi-step conversion process is likely to lead to increased errors associated with the ‘caking’ (radial binning) or fitting procedures. The 2D to 1D conversion of diffraction patterns is a necessary step used to prepare the data for full pattern refinement, but is inefficient when only peak centre position information is required for lattice strain evaluation. High energy 2D X-ray powder diffraction experiments are widely used for lattice strain measurement. ![]() Zhang, Hongjia Sui, Tan Daisenberger, Dominik Fong, Kai Soon Digital Image Correlation of 2D X-ray Powder Diffraction Data for Lattice Strain Evaluation
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