|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Scandium Extraction and Use in Aluminum Alloys
||The Effect of Scandium and Zirconium on the Microstructure, Mechanical Properties and Formability of a Model Al-Cu Alloy
||Thomas Dorin, Mahendra Ramajayam, Timothy Langan
|On-Site Speaker (Planned)
The addition of zirconium together with scandium is known to increase the strength of Al alloys. However, the impact of Sc on extruded age-hardenable Al-Cu alloys is currently unknown.
This work explores the impact of Sc and Zr on the formability, microstructure and mechanical properties of an extruded Al-4wt%Cu alloy. The addition of 0.1wt%Sc and 0.2wt%Zr is found to increase the yield strength by 150 MPa at room temperature with limited effect on the extrudability. The flow stress behavior is evaluated as a function of temperature and strain rate. The microstructure is investigated with electron backscattered diffraction, transmission electron microscopy and atom probe tomography.
The Al3(Sc,Zr) dispersoids are found to act as preferential nucleation sites for the θ’ precipitates and this accounts for most of the observed strength increase. The enhanced hot formability is related to the strong anti-recrystallization effect of Sc in Al.
||Planned: Light Metals