4th International Congress on 3D Materials Science (3DMS) 2018: Tuesday Plenary
Program Organizers: Hugh Simons, Denmark Technical University; Henning Poulsen, Denmark Technical University; David Rowenhorst, Naval Research Laboratory; Peter Voorhees, Northwestern University; Satoshi Hata, Kyushu Univ; McLean Echlin, UC Santa Barbara

Tuesday 8:00 AM
June 12, 2018
Room: Store Scene
Location: Kulturværftet (Culture Yard) Conference Center

8:00 AM  Plenary
Polycrystalline Materials in 4 Dimensions: Henry Proudhon1; 1MINES ParisTech
    Non-destructive synchrotron 3D microstructural imaging is now mature and can be paired with mechanical loading (4D testing) and subsequent mechanical simulations at the grain scale. This is a key to advance our understanding of how the polycrystalline microstructure controls the mechanical properties of structural materials. In the last years, large efforts were devoted to develop 3D orientation mapping capabilities in mm sized specimens, with micrometer spatial resolution. Automated serial sectioning methods paired with EBSD 3D orientation mapping, can target very complex microstructures although at the price of destructing the specimen. In parallel, the increasing popularity and capabilities of hard X-ray tomography coupled to diffraction to image the bulk of materials in three dimensions brings forward a new way to conduct microstructurally informed mechanical testing. In particular, Diffraction Contrast Tomography now provides 3D grain maps non destructively and allow further crystallographic specific investigations during mechanical testing. One of the key challenges is then to link 3D microstructure characterization tools with computational models (eg by finite elements or FFT) to predict engineering properties such as strength or fatigue resistance. In this presentation, examples of 3D experimental microstructure based large-scale computations using the crystal plasticity finite element method will be presented and compared with in situ mechanical testing experiments. Examples with microstructures obtained with both serial sectioning and Diffraction Contrast Tomography will be targeted. Simultaneous modeling/experimental approaches will be discussed in light of the results. One recurring difficulty in the field of 4D studies is the very small number of tested samples, due to the limit of synchrotron beam time availability and to the inherent difficulty to manipulate 4D data sets. Possible solutions to these problems will be discussed.

8:45 AM Question and Answer Period

9:00 AM Break