About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
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| Symposium
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Advancing the Frontier of Powder Materials Processing and Sintering: A MPMD/EPD Symposium in Honor of Eugene Olevsky
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| Presentation Title |
Reversal of Powder Surface Oxidation from Gas Atomization Reaction Synthesis to Promote Sintering and Subsequent Nano-Dispersoid Strengthening |
| Author(s) |
Iver E. Anderson, Zongyang Lyu, Kevin Jacob, Jordan Tiarks, Andrey Yakovenko, Siddhartha Pathak |
| On-Site Speaker (Planned) |
Iver E. Anderson |
| Abstract Scope |
Fe-14Cr-3W-0.4Y-0.4Zr-0.18Ti (wt.%) was developed as a reduced-activation oxide-dispersion strengthened (ODS) ferritic steel, enabled by non-equilibrium processing, i.e., rapid solidification, to replace the “14YWT” alloy. Instead of extensive, high-energy ball milling, gas atomization reaction synthesis (GARS) was used to directly fabricate metastable alloy powders. In-situ synchrotron X-ray diffraction on powders established that a crystalline (Cr, Ti)2O3 phase transformed at ~650C from glassy oxidized particle surfaces during heating and decomposed at ~800°C. X-ray results also revealed that an intercellular metastable phase related to (Y, Zr)2Fe17 intermetallic compound (IMC) phase formed during rapid solidification by GARS, which decomposed between 800 - 900C, providing the Y and Zr to form highly stable Y-(Ti, Zr)-oxide nanoparticles. Based on these measurements, spherical GARS powders were sintered by vacuum warm pressing, deformation processed at warm temperatures and heat-treated to complete formation of nano-scale Y-Ti-Zr-based oxide phases (20 ±7 nm) in the resulting alloy for extreme radiation-tolerant applications. |
| Proceedings Inclusion? |
Planned: |