Berlin 2018 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 4: Topical session (Symposium EPS and MM): Mechanical Properties at Small Scales
MM 4.1: Topical Talk
Montag, 12. März 2018, 10:15–10:45, TC 006
Plasticity in complex crystals * On the role of building blocks in intermetallics and layered compounds — •Sandra Korte-Kerzel1, Sebastian Schröders1, Stefanie Sandlöbes1, James Gibson1, and William Clegg2 — 1Institut für Metallkunde und Metallphysik, RWTH Aachen University, Aachen, Germany — 2Department of Materials Science and Metallurgy, University of Cambridge, UK
Plasticity in most complex crystals remains poorly understood owing to their brittleness and the associated difficulties in mechanical testing. The development of microcompression and its use in conjunction with electron microscopy has been a major step forward and systematic studies are now possible [1]. However, the uncharted phase space in terms of plastic deformation remains vast. In this context, the role of recurring building blocks in complex crystals and how plasticity may be governed by smaller elements in large unit cells is discussed in the light of intermetallic and atomically layered phases. Taking the extraordinary properties of MAX phases [2] and the topologically close packed μ-phase with its Laves building blocks as example, small-scale testing in conjunction with electron microscopy to atomic resolution and density functional theory calculations was used to elucidate the key components of the respective large unit cells.
[1] Korte-Kerzel, S. Microcompression of brittle and anisotropic crystals, MRS Comm 1-12 (2017) [2] Howie, P.R., Thompson, R. J., Korte-Kerzel, S., Clegg, W.J. Softening non-metallic crystals by inhomogeneous elasticity, Sci Rep 7, 11602 (2017)