Effect of solid oxygen source species on the Al-oxide precipitation behavior in Fe-Al alloys by powder metallurgy

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Abstract

Fe-Al alloy powder was mixed with Fe2O3, NiO and SiO2 powders, and the mixed powders were cold-pressed and annealed at 800°C. Nano-sized Al-oxides were precipitated within the α-Fe matrix of the Fe-Al alloy powder mixed with Fe2O3 and NiO. On the other hand, oxide precipitation was not confirmed within the α-Fe matrix of the SiO2 doped alloy. This difference is caused by the thermodynamic stability of the oxides, where Fe2O3 and NiO are not in equilibrium with α-Fe so that they are dissolved in the α-Fe matrix to form more stable Al-oxides, while SiO2 is in equilibrium with α-Fe thus the chemical driving force for the Al-oxide precipitation was small.

Original languageEnglish
Pages (from-to)478-484
Number of pages7
JournalFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Volume66
Issue number10
DOIs
Publication statusPublished - 2019 Jan 1

Keywords

  • Ellingham diagram
  • Internal oxidation
  • Oxide dispersion strengthened alloy
  • Precipitation hardening
  • Solid oxygen source

ASJC Scopus subject areas

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Metals and Alloys
  • Materials Chemistry

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