Use of neutron and X-ray diffraction to study the precipitation mechanisms of oxides in ODS materials

作者：Toualbi L; Ratti M; Andre G; Onimus F; de Carlan Y^*

来源：Journal of Nuclear Materials, 2011, 417(1-3): 225-228.

DOI：10.1016/j.jnucmat.2010.12.071

It is usually accepted that the formation of nano-clusters inside Oxide Dispersion Strengthened (ODS) materials is due to the dissolution of the yttrium oxide during the mechanical alloying and to the precipitation of the nano-oxides during the consolidation process.
A study was conducted to follow the dissolution and the re-precipitation of the phases after mechanical alloying and different heat treatments, A Fe-9Cr powder was milled during different milling times with 10 wt.% of yttria and/or titanium in a planetary mill. Using neutron and X-ray diffractions and the Rietveld method, the dissolution and re-precipitation of yttria was investigated.
Even with a content of 10 wt.%, the yttria particles disappear during milling to form a structure which can be described as Fe crystallites coexisting with amorphous domains composed of Y and O atoms. After annealing Y and O atoms re-precipitate into the matrix to form yttria crystallites.

• 出版日期2011-10-1
• 单位中国地震局