About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
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Symposium
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Local Ordering in Materials and Its Impacts on Mechanical Behaviors, Radiation Damage, and Corrosion
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Presentation Title |
Chemical and Structural Ordering in Amorphous Complexions Determines the Plasticity of Nanocrystalline Cu Alloys |
Author(s) |
Esther Hessong, Tianjiao Lei, Mingjie Xu, Timothy Rupert |
On-Site Speaker (Planned) |
Esther Hessong |
Abstract Scope |
Amorphous complexions are important microstructural features because they increase the toughness of the grain boundary region. Chemical segregation behavior in amorphous complexions of nanocrystalline Cu-rich alloys was investigated using high-resolution transmission electron microscopy. Dopant segregation behavior varied across complexions, where the dopants with favorable glass-forming ability were more concentrated in the center of the complexion, and dopants with less favorable-glass forming ability were more concentrated along the amorphous-crystalline interface. Additionally, nanobeam electron diffraction was used to obtain diffraction patterns across complexions at each real space pixel location, to compare the structure of the abutting crystals, amorphous-crystalline interfaces, and amorphous interior. The diffraction patterns of the local regions were correlated with differently oriented polyhedra, thus quantifying the short-range order across the grain boundaries. To determine the effects of the localized chemical and structural ordering, mechanical testing was performed on different length scales, including both in-situ micropillar compression and bulk compression tests. |
Proceedings Inclusion? |
Planned: |
Keywords |
Mechanical Properties, Characterization, Copper / Nickel / Cobalt |