|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Powder Metallurgy of Light, Reactive and Other Non-ferrous Metals
||AA5083 Powder Sintering Comparison Using AC and DC Currents
||Frank Kellogg, Michael Kornecki, Selva Vennila Raju, Brandon McWilliams, Ray Brennan
|On-Site Speaker (Planned)
Research on field-assisted sintering techniques (i.e. flash or spark plasma sintering (SPS)) has focused on DC current as the electrical field source as opposed to AC current. Studies using both AC and DC fields found that AC generated fields produced improved sintering rates and smaller grain sizes due to larger AC peak field, compared to DC at the same power level, and smaller mean free paths of ions under an oscillating field. In this study, aluminum alloy powder 5083, in as-atomized and cryomilled conditions, was sintered via SPS under a DC field and with a Gleeble 1500 under a 60Hz AC field. Samples sintered with DC and AC currents had similar microstructures, densities (upwards of 99% theoretical), and hardness values (Vickers microhardness values around 105), but were consolidated at lower temperatures with the AC field.
||Planned: Supplemental Proceedings volume