|About this Abstract
||Materials Science & Technology 2019
||Late News Poster Session
||P1-67: Microstructural Comparison of Deformation Processing Effects on Aluminum/Calcium Metal-metal Composite Conductor Wires
||Dustin Hickman, Charles Czahor, Trevor Riedemann, Iver E. Anderson
|On-Site Speaker (Planned)
Overhead high voltage direct current (HVDC) transmission cable choices lack a favorable combination of conductivity and strength. Al/Ca composite conductors have potential to elevate both through improvement of their deformation processed microstructure. A powder route for deformation processing Al/Ca metal-metal composite (MMC) conductors is being developed that employs powder blending, canning of compacts, warm extrusion, and the choice between swage + drawn and drawn-only wires for testing. As-processed results from four-point resistivity and tensile tests show higher potential for drawn-only wire than swage + drawn wire. This study will compare the as-processed composite microstructures of Al/Ca wires that were swaged + drawn, drawn-only, and heat treated up to 1000 hours. These thermal aging results will produce effects on filamentary reinforcements (Ca or Al2Ca) and matrix (Al) that control strength and conductivity and inform an upper operating temperature limit. Work funded by USDOE-OE through Ames Lab contract DE-AC02-07CH11358.