Microstructural characterization of Y2O3 ODS-Fe-Cr model alloys

Conference item

Two Fe-12 wt% Cr alloys, one containing 0.4 wt% Y2O3 and the other Y2O3-free, have been produced by mechanical alloying followed by hot isostatic pressing. These oxide dispersion strengthened and reference alloys were characterized both in the as-HIPed state and after tempering by transmission electron microscopy and atom-probe tomography. The as-HIPed alloys exhibited the characteristic microstructure of lath martensite and contained a high density of dislocations. Small voids with sizes <10 nm were also observed. Both alloys also contained M3C and M23C6 carbides (M = Cr, Fe) probably as a result of C ingress during milling. After tempering at 1023 K for 4 h the microstructures had partially recovered. In the recovered regions, martensite laths were replaced by equiaxed grains in which M23C6 carbides decorated the grain boundaries. In the ODS alloy nanoparticles containing Y were commonly observed within grains, although they were also present at grain boundaries and adjacent to large carbides. © 2009 Elsevier B.V. All rights reserved.

Authors: de Castro, V; Leguey, T; Munoz, A; Monge, M; Pareja, R

• Publication status: Published
• Host title: JOURNAL OF NUCLEAR MATERIALS
• Volume: 386-88
• Issue: C
• Pages: 449-452
• Publication date: 2009-04-30
• DOI: 10.1016/j.jnucmat.2008.12.136
• ISSN: 0022-3115