Strain inhomogeneity in copper islands probed by coherent X-ray diffraction (original) (raw)
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Grain-resolved elastic strains in deformed copper measured by three-dimensional X-ray diffraction
Materials Characterization, 2011
This X-ray diffraction study reports the grain-resolved elastic strains in about 1000 randomly oriented grains embedded in a polycrystalline copper sample. Diffraction data were collected in situ in the undeformed state and at a plastic strain of 1.5% while the sample was under tensile load. For each grain the centre-of-mass position was determined with an accuracy of 10 μm, the volume with a relative error of 20%, the orientation to 0.05°and the axial strain to 10 − 4 . The elastic strain along the tensile direction exhibited a grain orientation dependence with grains within 20°of <100> carrying the largest strain. While the width of the strain distribution for all grains did not change upon plastic loading, the grain-resolved data show a significant widening of the distribution evaluated for small subsets of initially elastically similar grains. This widening appears independent of the grain orientation.
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