Abstract
High chrome oxide dispersion strengthened (ODS) ferritic alloys exhibit a high mechanical resistance at high temperature as well as high resistance to radiation damage due to its high density of Y–Ti–O nano clusters. In order to correlate the coarsening resistance of Fe–14Cr–1W ODS alloys with nano-particle coherency degree and nominal content of Y and Ti, SANS analysis and TEM investigations are used to characterize the size distributions of nano oxides and the interface configuration before and after heat treatment at 1300°C. The result indicates that the ratio of Ti/Y plays an important role on the coarsening kinetics. The nano oxides of the sample with a high ratio of Ti/Y superior to 1 are more stable owing to the minimizing of the interfacial energy particle/matrix.
Published Version
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