|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Ultrafine-grained Materials X
||Oxygen and Zirconium Clustering in Nanocrystalline Fe-Zr Alloys and its Impact on Microstructural Stability and High Temperature Mechanical Properties
||Yuzeng Chen, Guibin Shan, Anna Ceguerra, Simon Ringer, Feng Liu
|On-Site Speaker (Planned)
Nanocrystalline Fe-Zr alloys exhibit extraordinary thermal stability to resist grain coarsening at elevated temperatures, which enables their potential applications in various engineering fields. It has been suggested the stabilization of nanoscale grain size of these alloys is ascribed to the reduction in grain boundary energy by Zr segregation in grain boundaries and Zener pinning of Fe<SUB>3</SUB>Zr precipitates. Our new results obtained by a combined investigation of high-resolution X-ray diffraction, transmission electron microscopy, and atom probe tomography indicate that upon heating at elevated temperatures, oxygen and zirconium clustering occur, leading to the formation of highly dispersed nanoscale Zr enriched oxides which show highly coherent with b.c.c. ferrite matrix. These nano-oxides are believed to play an important role in stabilizing grain size of the nanostructure and the superior high temperature mechanical properties, such as high strength and excellent creep resistance, compared to common oxides dispersed steels.
||Planned: Supplemental Proceedings volume