Role of Y-Al Oxides During Extended Recovery Process of a Ferritic ODS Alloy

© 2015, The Minerals, Metals & Materials Society. The microstructural stability of Y-Al oxides during the recrystallization of Fe-Cr-Al oxide dispersion strengthened alloy is studied in this work. The goal is to determine the specific distribution pattern of oxides depending where they are located: in the matrix or at the grain boundaries. It was concluded that those located at the grain boundaries yielded a faster coarsening than the ones in the matrix, although no significant differences in composition and/or crystal structure were observed. However, the recrystallization heat treatment leads to the dissolution of the Y2O3 and its combination with Al to form the YAlO3 perovskite oxide particles process, mainly located at the grain boundaries. Finally, atom probe tomography analysis revealed a significant Ti build-up at the grain boundaries that might affect subsequent migration during recrystallization.PM 2000™ is a trademark of Plansee GmbH. LEAP® is a registered trademark of Cameca Instruments, Inc. CC and GP acknowledge financial support to Spanish Ministerio de Ciencia e Innovación in the form of a Coordinate Project in the Energy Area of Plan Nacional 2009 (ENE2009-13766-C04-01). GP acknowledges the MINECO for supporting her research under a FPI Grant (BES-2010-032747) and two summer internship grants: EEBB-I-12-03885 at the ORNL (USA) and EEBB-I-2013-07176 at the University of Liverpool (UK).Peer Reviewe