Dresden 2017 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 25: Topical session: Interface-Controlled Microstructures: Mechanical Properties and Mechano-Chemical Coupling - Structure and Deformation I

MM 25.1: Topical Talk

Dienstag, 21. März 2017, 10:15–10:45, BAR 205

Atomistic Studies on the Role of Interface Curvature on Deformation and Failure of Interface-Controlled Materials — •Erik Bitzek — Department of Materials Science and Engineering, FAU Erlangen-Nürnberg

Since processes like crack nucleation and intragranular propagation as well as dislocation nucleation, absorption, transmission or pinning take place at the atomic scale, atomistic simulations have played a key role in studying grain- and interphase boundaries (GBs, IPBs). However, so far most of the studies on the deformation and failure of interface-dominated materials have been performed on simulation setups with planar interfaces.

Here we give an overview on our recent atomistic studies on intergranular fracture and dislocation-interface interactions, with the focus on non-planar boundaries and more realistic GB topologies. Examples include the importance of interface curvature on the misfit dislocation network in realistic microstructures of Ni-base superalloys, studies of slip transmission through curved GBs and the overemphasis or completely suppression of deformation mechanisms in nanocrystalline samples with different degrees of GB curvature.