Investigating the effect of grain interaction during plastic deformation of copper

• Published in: Acta materialia 2004-09, Vol.52 (15), p.4461-4467
• Main Authors: Lienert, U., Han, T.-S., Almer, J., Dawson, P.R., Leffers, T., Margulies, L., Nielsen, S.F., Poulsen, H.F., Schmidt, S.
• Format: Article
• Language: English
• Subjects: ADVANCED PHOTON SOURCE; Condensed matter: structure, mechanical and thermal properties; COPPER; Cross-disciplinary physics: materials science; rheology; DEFORMATION; Deformation and plasticity (including yield, ductility, and superplasticity); Deformation, plasticity, and creep; Exact sciences and technology; Finite-element modelling; GRAIN BOUNDARIES; INTERFACES; Internal stresses; MATERIALS SCIENCE; Mechanical and acoustical properties of condensed matter; Mechanical properties of solids; Metal; Physics; Plastic deformation; PLASTICITY; Treatment of materials and its effects on microstructure and properties; X-ray diffraction
• ISSN: 1359-6454; 1873-2453
• DOI: 10.1016/j.actamat.2004.05.051

By diffraction of high-energy synchrotron X-rays, the variance of the axial lattice strains of individual grains is measured during tensile loading of a weakly textured copper polycrystal. Peak profiles are measured for {4 4 0} reflections arising from 20 bulk grains, all of which are at least one average grain diameter below the surfaces within a 0.2-mm thick specimen. The reflecting lattice planes are all perpendicular to the tensile axis. The variance in lattice strain between grains can therefore be attributed to differences in the boundary conditions imposed by the different sets of neighboring grains. The results are compared to finite-element modelling (FEM). Up to the highest applied strain of 2%, the experimental and FEM values are in fair agreement and the standard deviations may be roughly approximated as 6% of the average axial lattice strains.