Microstructure and room temperature strength of Fe-40Al containing nanocrystalline oxide particles

Nanoprecipitation of oxide particles and related high strength in oxide-dispersion-strengthened iron–aluminium–chromium intermetallics

“…Previous studies have shown similar effects [18,27], namely that additional oxide is produced during milling but that the volume fraction of usefully fine particles is somewhat lower than the nominal value. Finally, it should be recalled that material strengthening will depend greatly on the number of fine particles present, with smaller numbers of larger particles being less important, despite their accounting for significant volume fractions.…”

“…These two analyses were determined on fine disk precipitates, while coarser particles present in the materials were found to have a composition similar to the Al-rich disk precipitates. Previous studies on binary Fe-Al alloys [27,28] have shown that the oxide particles present here are mixed YAl-Fe oxides, without providing a precise chemical composition.…”

Microstructure of a High-Velocity Oxy-Fuel Thermal-Sprayed Nanostructured Coating Obtained from Milled Powder

“…It is, indeed, clear from the micrograph in Figure 5(a) that the oxide particles did not completely precipitate out from the matrix and that their number is much lower than that usually obtained in this alloy. [23,24] This is due to the very rapid thermal cycle applied during the spraying process. As a consequence, this must lead to significant grain-boundary mobility at even lower temperatures.…”

“…[7,11,22] The Y 2 O 3 was introduced at the milling stage, to create strengthened powder particles by fine Y 2 O 3 dispersions that can pin grain boundaries under subsequent processing and use. [23,24] The Y 2 O 3 particles decomposed and dissolved into the supersaturated FeAl matrix during the milling procedure. [14] as was also observed in steels.…”

Synthesis and characterization of porous Fe–25 wt.% Al alloy with controllable pore structure

“…The wide applications of the FeAl intermetallics are limited by two key problems: eliminating the pores caused by the Kirkendall effect (due to the different diffusion rates of Fe and Al) during the sintering procedure [2][3][4] and improving the ductility and creep resistance at ambient temperatures [5]. In spite of the recent advances in improving brittleness at ambient temperatures and creep resistance by controlling the microstructure, such as grain boundary strengthening, oxide dispersion strengthening, and grain refinement [6][7][8][9][10], industry applications of these alloys are still limited.…”