About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
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Symposium
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TMS-DGM Symposium: A Joint US-European Symposium on Linking Basic Science to Advances in Manufacturing of Lightweight Metals
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Presentation Title |
Spatial Correlations between Strengthening Particles in Multi-phase Hardenable Aluminum Alloys |
Author(s) |
Viktor Wessely, Robin Schäubin, Stephan S. A. Gerstl, Stefan Pogatscher, Peter J. Uggowitzer, Jörg F. Löffler |
On-Site Speaker (Planned) |
Viktor Wessely |
Abstract Scope |
We focus on a new generation of hardenable aluminum alloys based on the formation of coherent Al<sub>3</sub>X L1<sub>2</sub>-structured dispersoids. Suitable alloying elements are, amongst others, Zr and Hf, which are known to strengthen the material while providing exceptional high-temperature stability due to their low diffusivity. Thermodynamic and kinetic modeling is deployed to design alloys and their heat treatments, with subsequent mechanical and microstructural characterization. The dispersoids form as an ordered phase coherent with the fcc matrix. Studying their evolution in Al–Mg–Zn alloys with <1 wt.% Hf and Zr, we find that the Al<sub>3</sub>X dispersoids have a significant impact on the alloys’ hardening characteristics. Detailed insights into the microstructure obtained by a multi-scale microstructural analysis based on high-end transmission electron microscopy (TEM) and atom-probe tomography (APT) reveal that the key to a successful alloy design lies in controlling the spatial correlation between the dispersoids and precipitate phase. |
Proceedings Inclusion? |
Planned: |
Keywords |
Aluminum, Phase Transformations, Characterization |