Dresden 2020 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 30: Poster Session II

MM 30.3: Poster

Tuesday, March 17, 2020, 18:15–20:00, P4

Observing the atomic structure of [111] tilt grain boundaries in Al — •Saba Ahmad, Christian Liebscher, and Gerhard Dehm — Max-Planck-Institute for Iron Research, 40237 Düsseldorf, Germany

Grain boundaries can be described as interface-stabilized phases which exhibit transitions between different states. These transitions are marked by discontinuous changes in grain boundary properties like mobility, cohesive strength and sliding resistance, etc. that are governed by the structure and chemistry of a grain boundary. Understanding the atomic structure of these interfacial states and the way it influences the GB properties can pave the way for GB engineering. But, a detailed understanding of the atomic structure of the GBs and their atomistic segregation behaviour is often lacking. Epitaxial aluminium thin films were deposited on (0001) sapphire substrate by electron beam evaporation technique with different deposition parameters to establish a template based methodology for obtaining specific tilt GB types. EBSD measurements were employed to characterize the global GB structure, type and fractions present in the films. Cross-sectional view TEM samples from different films were prepared using plasma (Xe) focused ion beam (FIB) to systematically study the growth of aluminium on sapphire. Also, plan-view samples having Σ13b, Σ19b, and Σ7 GBs were extracted. First results of the local atomic structure of these GBs using advanced transmission electron microscopy techniques will be reported and discussed.