Grain-resolved elastic strains in deformed copper measured by three-dimensional X-ray diffraction
- Center for Fundamental Research: Metal Structures in Four Dimensions, Materials Research Division, Riso DTU, Frederiksborgvej 399, DK-4000 Roskilde (Denmark)
- European Synchrotron Research Facility, 38043 Grenoble (France)
- Max-Planck-Institut fuer Eisenforschung GmbH, Max-Planck-Str. 1, 40237 Duesseldorf (Germany)
- Technische Universitaet Berlin, Sekr. BH18, Ernst-Reuter-Platz 1, 10587 Berlin (Germany)
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 {mu}m, the volume with a relative error of 20%, the orientation to 0.05{sup o} and the axial strain to 10{sup -4}. The elastic strain along the tensile direction exhibited a grain orientation dependence with grains within 20 deg. 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. - Research Highlights: {yields} X-ray diffraction study of {approx} 1000 Cu grains during in situ plastic deformation. {yields} Grain averaged positions, orientations, volumes and elastic strain tensors derived. {yields} Both lattice rotation and axial strain depend on the initial grain orientation. {yields} Grains within 20{sup o} of <100> carry the largest elastic strain along the tensile axis. {yields} The results enable evaluation and development of polycrystal plasticity models.
- OSTI ID:
- 22066375
- Journal Information:
- Materials Characterization, Journal Name: Materials Characterization Journal Issue: 7 Vol. 62; ISSN 1044-5803; ISSN MACHEX
- Country of Publication:
- United States
- Language:
- English
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