About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
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Symposium
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Powder Materials Processing and Fundamental Understanding
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Presentation Title |
Understanding Solidification and Alloying Effects in Oxide Dispersoid Strengthened Alloy Powders Produced by Gas Atomization Reaction Synthesis |
Author(s) |
Emma Cockburn, Iver A Anderson, Nicolas Argibay, Jordan Tiarks, Trevor Reidemann, Ralph Napolitano |
On-Site Speaker (Planned) |
Emma Cockburn |
Abstract Scope |
Mechanical alloying (MA) has been a focus in developing processing methods for oxide dispersion strengthened (ODS) alloys for ultrahigh temperature and/or high-flux radiation tolerant applications. MA is time-consuming and may introduce contamination and inhomogeneities. Gas atomization reaction synthesis (GARS) can produce cleaner powders for ODS alloy processing with Cr-enriched surface oxides and Y-containing intermetallics, creating oxide dispersoids during laser-powder bed fusion additive manufacturing and solid-state friction/stir consolidation by indirect extrusion fabrication. This work will investigate the ability to control/suppress intermetallics by adjusting the amount of alloying elements, including yttrium additions beyond the limits of MA, and oxygen available during the solidification reaction in the atomization process. Relating the solidification rate to particle size will demonstrate the influence the rate has on segregation and intermetallic phase formation, while also providing insight to the kinetics of solute redistribution. Funded by USDOE-ARPA-e program through Ames Lab contract no. DE-AC02-07CH11358. |
Proceedings Inclusion? |
Planned: |