Brown University School of Engineering

Joint Materials/Solid Mechanics Seminar Series: “Characterization and Modeling of the Influence of Mesotexture on Heterogeneous Deformation”

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Monday, March 31, 2014 4:00pm - 5:00pm

Tom Bieler, Michigan State University. Deformation within a given grain is highly influenced by deformation its neighboring grains, which impose boundary conditions on each other that vary spatially. Hence, crystal plasticity modeling of microstructures is important for predicting and investigating heterogeneous deformation. Accurate modeling of heterogeneous deformation will allow predictions of damage nucleation, which is caused by heterogeneous deformation. When modeling of heterogeneous deformation is credible, it can also be used to interpret experimental observations. To this end, detailed experimental measurements of heterogeneous deformation are desirable for model validation, and when combined with experimental measurements, new insights about deformation mechanisms can be gained. Four examples of this kind will be described: (1) polycrystalline Ta characterized with EBSD measurements to examine operative slip systems and slip transfer (or the lack of it) across grain boundaries, (2) in-situ characterization of microstructure evolution in specific solder joints that leads to crack nucleation, (3) tensile deformation of textured polycrystalline commercial purity titanium in which 3-D tomographic diffraction measurements are made to track nucleation of mechanical twins, and (4) experimental characterization of a patch of grains in a Ti-5Al-2.5Sn alloy using 3-D differential aperture x-ray microscopy and SEM/EBSD measurements, to compare with a true 3-D crystal plasticity finite element model of the same patch deformed to a similar strain. T.R. Bieler, M.A. Crimp, C.J. Boehlert, P. Eisenlohr, H. Li, C. Zhang, S.C. Sutton, Z.A. Keith, B.E. Dunlap, L. Wang, P. Kenesei, A. Beaudoin, U. Lienert, W. Liu, Michigan State University, Max-Planck-Institut für Eisenforschung, Argonne National Laboratory/Advanced Photon Source, University Illinois Urbana Champaign. Funding for this work comes from: Sandia National Laboratories, Albuquerque, National Science Foundation (Materials World Network grant with DFG, GOALI with Cisco), Department of Energy/Basic Energy Sciences.