| 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, e.g., nuclear power. While capable of providing “mechano-chemical” mixing of yttria and alloy (Fe- or Ni-based) powders, MA is time-consuming and may introduce contamination and inhomogeneities. Gas atomization reaction synthesis (GARS) for producing powders for ODS alloy processing provides cleaner feedstock powders 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 control/suppression these intermetallics by adjusting the amount of alloying elements available during the solidification reaction in the atomization process. Through thermodynamic calculations, X-ray diffraction data, and microstructural analysis of castings and powders, valuable details about alloying levels can be connected to intermetallic data. Funded by USDOE-ARPA-e program through Ames Lab contract no. DE-AC02-07CH11358. |