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The broadening of diffraction peak profiles of plastically deformed face-centred cubic and hexagonal close-packed alloys, and results of the Warren-Averbach method, are shown to be dependent on the measurement direction. Polycrystal plasticity models are used to show that these changes could be due to the heterogeneity of deformation, which results in differences in the types of dislocations and dislocation structures in different orientations, highlighting how errors can result from the use of an unweighted contrast factor.
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