|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Aluminum Alloys, Processing and Characterization
||Understanding the Co-precipitation Mechanisms of Al3(Sc, Zr) with Strengthening Phases in Extruded Al-Cu-Li Model Alloys
||Katrin Mester, Thomas Dorin, Matthias Weiss, Matthew Barnett
|On-Site Speaker (Planned)
Al-Cu-Li alloys are used in the aeronautic sector due to their exceptional specific strength. The addition of Zr is traditionally used in these alloys due to the recrystallisation delaying Al3Zr dispersoids. Similarly, Scandium forms fine Al3Sc dispersoids. These dispersoids have also the advantage of strengthening the alloys with as much as 100MPa increase per 0.1 wt%Sc added. The main disadvantage of these dispersoids is their poor thermal stability during the solution heat treatment which leads to their coarsening and dissolution.
This project explores the addition of Zr and Sc which leads to the formation of Al3(ScxZr1-x) dispersoids. These dispersoids improve strengthening, inhibit recrystallisation whilst being thermally stable and are thus beneficial for the next generation of Al-Cu-Li alloys.
In this study, we investigate the effect of these dispersoids on the formation kinetics of precipitates. TEM and SANS are used and the main contributions to strength are discussed.
||Planned: Light Metals