Comparative First-Principles Study of the YTiO/Matrix Interface in ODS Alloys.

Oxide-dispersion-strengthened (ODS) alloys generally exhibit extraordinary service performance under severe conditions through the formation of ultrafine nano oxides. YTiO has been characterized as the major strengthening oxide in Fe-based ODS alloys. First-principles energetic analyses were performed to investigate the structural, elastic and interface properties of YTiO in either Fe-based or Ni-based ODS alloys.

The Precipitated Particle Refinement in High-Cr ODS Steels by Microalloying Element Addition.

Two oxide-dispersion-strengthened (ODS) steels with different compositions (14Cr-ODS and 14Cr-Zr-ODS) were investigated to reveal the influences of microalloying element addition on the microstructure and to clarify the refining mechanism of precipitated particles. TEM and HRTEM results indicated that precipitated particles in the Zr-containing ODS steel had finer sizes and dispersed more homogeneously within the grains. It was found that rhombohedral YZrO particles with complex lattice structures were formed and could pin the migration of the grain boundaries during heat treatment due to their high thermal stability.