Regensburg 2019 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 35: Topical session (Symposium MM): Correlative and in-situ Microscopy in Materials Research

MM 35.6: Vortrag

Donnerstag, 4. April 2019, 12:30–12:45, H45

Correlative TEM and XRD study of the role of Au on the solid state dewetting behavior of Au/Ni bilayers on α-Al2O3 — •Johannes Will¹, Patrick Herre¹, Tobias Zech¹, Johanna Schubert¹, Mingjian Wu¹, Tadahiro Yokosawa¹, Jan Schwenger¹, Stefan Romeis¹, Dong Wang², Tobias Unruh¹, Wolfgang Peukert¹, and Erdmann Spiecker¹ — ¹FAU Erlangen-Nürnberg — ²TU Ilmenau

In this study, we investigated the influence of Au on the structure and properties of binary Au-Ni nanoparticles (NPs) equilibrated by solid-state dewetting and subsequent quenching on (0001) oriented sapphire single crystals. We contribute to the research field by investigating the role of Au on the mechanical as well as structural properties of Au-Ni NPs by a systematic variation of the Au content. Here, our methodological approach is to combine TEM and EDXS with XRD in order to obtain complementary information about the morphology, orientation and in-plane as well as out-of-plane strain of the NPs with respect to the sapphire substrate. Furthermore, the impact of alloying and interface structure on the mechanical properties of the NPs was tested by in situ SEM compression experiments. As shown by XRD and TEM, it is possible to fabricate alloyed NPs for all investigated Au concentrations. Moreover, a pronounced in- and out-of-plane orientational relationship is demonstrated. In addition, no misfit dislocations at the NP substrate interface are present. This kind of interface is in-line with previous findings for pure Ni NPs, where it was denoted as delocalized coherent interface.