About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Scandium Extraction and Use in Aluminum Alloys
|
Presentation Title |
Developing Al-Zr-Sc Alloys as High-temperature-resistant Conductors for Electric Overhead Powerline Applications |
Author(s) |
Quan Shao, Emad Elgallad, Alexandre Maltais, X.-Grant Chen |
On-Site Speaker (Planned) |
X.-Grant Chen |
Abstract Scope |
The effect of small Sc additions (within ~0.1 wt.%) to improve the mechanical properties and electrical conductivity of Al-Zr-Sc conductor wires with two thermo-mechanical processing routes was investigated. The thermal resistance properties of Sc-containing wires after thermal exposure at 310 oC and 400 oC were investigated according to the international standard IEC 62004. The results show that a simultaneous improvement of mechanical properties and electrical conductivity while maintaining outstanding thermal resistance was achieved by micro-alloying with Sc and by using an optimized thermo-mechanical processing route. This was attributed to the precipitation of a high number of Al3(Sc,Zr) nanoparticles. Optimal properties with various combinations of the ultimate tensile strength and electrical conductivity (188-200 MPa and 58-60% IACS) were obtained with conventional casting, rolling and wire drawing techniques to fulfill the particular requirements of different conductor grades. The newly developed conductor alloys provide a much-needed outstanding performance for electric overhead line applications. |
Proceedings Inclusion? |
Planned: Light Metals |
Keywords |
Aluminum, High-Temperature Materials, Characterization |