|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Scandium Extraction and Use in Aluminum Alloys
||Influence of the Al3(Sc,Zr) Dispersoids and the Stretching on the Natural Ageing Behavior of a Binary Al-4wt%Cu Alloys
||Baptiste Rouxel, Thomas Dorin
|On-Site Speaker (Planned)
Aluminium alloys are extensively used in the aerospace industry due to their high specific strength. Combined Scandium and Zirconium additions result in the formation of nanometer-size Al3(Sc,Zr) dispersoids which considerably increase the mechanical properties of these alloys.
Recent research on Al-Cu-Sc-Zr model alloys showed that these dispersoids accelerate the formation kinetics of the copper rich precipitates and modify their precipitation sequence. This behaviour was then further investigated on industrial 2xxx series alloys with different amount of Zr and Sc addition. The precipitation kinetics was investigated with hardness and tensile measurements. TEM and DSC were used to characterise the precipitates formed.
The strength increment during natural ageing was found to be higher in Sc and Zr containing and pre-stretched alloys as compared to the Sc free alloys. The results suggest that could be due to the formation of metastable θ-like phase at the detriment of the most common GP zone phases.
||Planned: Light Metals