Dispersion behaviour of oxide particles in mechanically alloyed ODS steel

Characterization of High Temperature Creep Properties in Recrystallized 12Cr-ODS Ferritic Steel Claddings

“…From the present study, it is found that the complex oxide formation of αY 2 TiO 5 is likely to be responsible for the drastic reduction of the oxide particle size in the F4 specimen. As for the difference of oxide particle size reduction by formation of αY 2 TiO 5 and Y 2 Ti 2 O 7 , the lattice distortion and misfit energy at the interface between oxide particle and ferritic matrix may affect it, when they thermally precipitate during the hot-extrusion process, based on previous findings that yttria particles were dissolved in the ferritic matrix during mechanical milling and then thermally precipitated as fine complex oxide particles by combining yttrium, titanium and excessive oxygen during the hot-extrusion process at 1,423 K. 17,18) IV. High Temperature Strengthening Mechanism…”

Development of 9Cr-ODS Martensitic Steel Claddings for Fuel Pins by means of Ferrite to Austenite Phase Transformation

“…The value of TiO 2 content estimated from the soluble titanium and excessive oxygen are given in TiO 5 in M93. The co-authors discovered by means of X-ray diffraction analysis that Y 2 O 3 particles are dissolved in the matrix during mechanically alloying and then thermally precipitated as fine complex oxide, αY 2 TiO 5 , by combining yttrium, titanium and excessive oxygen during the hotextrusion process at 1,423 K. 19) Hence, the extent of particle size refinement at the stage of hot-extrusion would depend on the degree of stoichiometry, and the reason why M92 contained extremely reduced size of oxide particles can be explained by its presenting a composition close to the stoichiometry of αY 2 TiO 5 .…”

An in situ powder neutron diffraction study of nano-precipitate formation during processing of oxide-dispersion-strengthened ferritic steels

“…The structure and chemistry of the nano-oxide particles in ODS steels have been investigated by using various techniques [2][3][4][5][6][7][8][9][10][11], based on which the commonly proposed mechanism for the formation of nano-oxide particles is that room temperature MA produces a supersaturated solid solution containing Y, Ti and O which decomposes during high temperature consolidation to precipitate nano-oxide particles [1]. A 4 brief review of some key findings that support this mechanism and the remaining uncertainties and limitations of techniques is discussed below.…”