Materials Science and Engineering, Ames Laboratory
38th Risø International Symposium on Materials Science
Journal or Book Title
IOP Conference Series: Materials Science and Engineering
Advanced Metallic Materials by Microstructural Design
September 4-8, 2017
Efficient long-distance power transmission is necessary as the world continues to implement renewable energy sources, often sited in remote areas. Light, strong, high-conductivity materials are desirable for this application to reduce both construction and operational costs. In this study an Al/Ca (11.5% vol.) composite with nano-filamentary reinforcement was produced by powder metallurgy then extruded, swaged, and wire drawn to a maximum true strain of 12.7. The tensile strength increased exponentially as the filament size was reduced to the sub-micron level. In an effort to improve the conductor's ability to operate at elevated temperatures, the deformation-processed wires were heat-treated at 260°C to transform the Ca-reinforcing filaments to Al2Ca. Such a transformation raised the tensile strength by as much as 28%, and caused little change in ductility, while the electrical conductivity was reduced by only 1% to 3%. Al/Al2Ca composites are compared to existing conductor materials to show how implementation could affect installation and performance.
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Czahor, Charles F.; Anderson, Iver E.; Riedemann, Trevor M.; and Russell, Alan M., "Deformation processed Al/Ca nano-filamentary composite conductors for HVDC applications" (2017). Materials Science and Engineering Conference Papers, Posters and Presentations. 44.