|About this Abstract
||3rd World Congress on High Entropy Alloys (HEA 2023)
||Multi-scale Characterization of 3D Printable CrCoNi-based ODS-MPEAs by Advanced Stereo-STEM Cross-correlated with EDS
||Milan Heczko, Timothy M Smith, Christopher A. Kantzos, Veronika Mazanova, Antonin Dlouhy, Michael J. Mills
|On-Site Speaker (Planned)
Our recent work (Nature, 2023) has demonstrated a new strategy to design alloys for high-temperature applications using additive manufacturing. Combining multi-principal element alloy (MPEA) and oxide-dispersion-strengthening (ODS) concepts opens up a vast unexplored compositional space to develop new 3D printable alloys. Here, we reveal the microstructural origins of the extraordinary performance of these new alloys using advanced multi-scale characterization approaches based on stereo-scanning transmission electron microscopy (STEM) cross-correlated with probe-corrected energy-dispersive X-ray spectroscopy (EDS). Stereo-STEM provides a direct and realistic 3D impression of the microstructure in a STEM foil. It enables precise measurement of local foil thickness, allowing quantitative assessment of the oxide dispersion including volume density and mean particle spacing. Combined with local defect density measurements, this approach provides detailed information about the microstructure of ODS-MPEAs. Critical aspects determining performance of 3D printable ODS-MPEAs are systematically identified and discussed.
||Planned: Metallurgical and Materials Transactions