Combined in situ mechanical testing and scale-bridging 3D analysis of nanoporous gold
October 1-6, 2017
In this work we present results on in situ small scale testing of nanoporous gold (npg) in scanning electron microscopy (SEM) and transmission electron microscopy (TEM). By combining nano- and micromechanical testing of pillar structures with advanced tomographic imaging, a 3D characterization of the plastic deformation process in different states of deformation is achieved. For small strut sizes 360° electron tomography (ET) is applied enabling high quality reconstructions of the 3D morphology of npg without missing-wedge artefacts. Combining the geometric information with mechanical data from in situ testing in SEM and TEM the yield strength is precisely determined. Furthermore, the experimentally derived 3D data are used as input for large-scale molecular dynamics (MD) simulations in order to understand the role of strain localization and identify predominant defect processes.
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Erdmann Spiecker, Thomas Przybilla, Julien Guénolé, Arun Prakash, Erik Bitzek, Zhuocheng Xie, Peter Schweizer, Mirza Mačković, Benjamin Winter, Florian Niekiel, Erich Thiess, Stephen T. Kelly, and Hrishikesh A. Bale, "Combined in situ mechanical testing and scale-bridging 3D analysis of nanoporous gold" in "Nanomechanical Testing in Materials Research and Development VI", Karsten Durst, Technical University of Darmstadt, Germany Eds, ECI Symposium Series, (2017). http://dc.engconfintl.org/nanomechtest_vi/105