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Meeting 2021 TMS Annual Meeting & Exhibition
Symposium TMS-DGM Symposium: A Joint US-European Symposium on Linking Basic Science to Advances in Manufacturing of Lightweight Metals
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

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Al-Fe-Si Phase Stabilization Using Experimentally Validated Computational Thermodynamics
Fracture Mechanisms under Monotonic Tensile, Fatigue, and Creep Deformation of Cast Al-Cu-Mn-Zr Alloys: Impact of Brittle Intermetallic Grain Boundary Particles
High-throughput Evaluation of Hardening Potency and Solubility of Eight Alloying Elements in Magnesium
High-throughput Experimental Techniques to Measure the CRSS for Slip and Twinning in Mg and Mg Alloys
Solute-vacancy Clustering in Aluminum
Spatial Correlations between Strengthening Particles in Multi-phase Hardenable Aluminum Alloys
Stacking-fault Mediated Plasticity and Strengthening in Lean, Rare-earth Free Magnesium Alloys
Study of the Solidification Pathways of Hypo/hyper-eutectic Al-Ce over a Wide Range of Thermal Histories
The Microstructure, Morphology and Mechanical Properties of Rapidly Solidified Al-10wt%Si-0.4wt%Sc Alloy

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