Regensburg 2013 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 51: Nanomaterials - Nanocrystalline & Porous Materials I
MM 51.5: Vortrag
Donnerstag, 14. März 2013, 11:15–11:30, H25
Following the deformation processes of nanocrystalline PdxAu1-x by the combination of in-situ straining and ACOM-TEM — •Aaron Kobler1,2, Christian Kübel1, and Horst Hahn1,2 — 1Karlsruhe Institute of Technology (KIT), 76021 Karlsruhe, Germany — 2Technische Universität Darmstadt (TUD), 64287 Darmstadt, Germany
Understanding the deformation mechanisms in nanocrystalline (nc) metals and alloys is crucial for improving their performance and stability as needed for technical applications. Most of our current understanding stems from in-situ deformation experiments on bulk nc materials using XRD. However, it is difficult to understand the local processes based on bulk measurements. The local processes are traditionally investigated using classical BF/DF-TEM. Recently, ACOM-TEM is used instead of BF/DF-TEM as it identifies the crystallographic orientation of all crystallites and detects all CSL special boundaries within the imaged area. We have implemented the ACOM-TEM (NanoMegas) on a FEI Tecnai-F20 in micro-probe (up) STEM mode, that allows us to acquire (fast) STEM reference images. We combined ACOM-TEM imaging with in-situ straining inside the TEM using Hysitron's TEM Picoindenter using steps of increasing strain. First investigations were conducted on magnetron sputtered Au samples. Deformation of this film inside the TEM allowed us to follow the continuous process of grain growth and grain rotation in nc Au with increasing strain. New results on the influence of alloying content in PdxAu1-x on the deformation mechanisms will be discussed.