Regensburg 2013 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 32: Topical Session: TEM-Symposium - Structure-Property / In-Situ I

MM 32.1: Topical Talk

Mittwoch, 13. März 2013, 10:15–10:45, H25

Structure and deformation processes of nanocrystalline metals characterized by ACOM-STEM in combination with in-situ straining — Aaron Kobler^{1, 2}, Horst Hahn^{1, 2}, and •Christian Kübel^{1, 3} — ¹Karlsruhe Institute of Technology (KIT), Institute of Nanotechnology, 76021 Karlsruhe, Germany — ²Technische Universität Darmstadt (TUD), KIT-TUD Joint Research Laboratory Nanomaterials, 64287 Darmstadt, Germany — ³Karlsruhe Institute of Technology (KIT), Karlsruhe Nano Micro Facility, 76021 Karlsruhe, Germany

Understanding the deformation mechanisms in nanocrystalline (nc) metals and alloys is crucial for improving their performance and stability as needed for technical applications. In-situ deformation studies using XRD have contributed significantly to our current understanding of nc metals. However, it is difficult to understand the local processes and thin-film properties based on bulk measurements. These local processes are traditionally investigated using classical BF/DF-TEM. As an alternative, automated crystal orientation mapping (ACOM) inside a TEM has recently been developed for nanocrystalline materials as it allows identification of the crystallographic orientation of all crystallites and detects the CSL special boundaries within the imaged area. We have implemented ACOM on a FEI Tecnai F20 in micro-probe (up) STEM mode, that allows us to also acquire (fast) STEM reference images. We combined this ACOM-STEM imaging with in-situ straining inside the TEM using Hysitron*s Picoindenter. First investigations were conducted on magnetron sputtered Au samples and deformation of these films inside the TEM allowed us to follow the process of grain growth, grain rotation and (de)twinning in nc Au with increasing strain. New results will discuss the influence of alloying content in PdxAu1-x on the deformation behavior.