Development of porosity in an oxide dispersion-strengthened ferritic alloy containing nanoscale oxide particles

The development of porosity at 1000 °C in an oxide dispersion-strengthened ferritic alloy containing nanoscale (∼2–4 nm) oxide particles is investigated. A comparison with an alloy fabricated by internal oxidation instead of mechanical alloying demonstrates that the porosity formation is associated...

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Bibliographic Details
Published in:Scripta materialia 2007-12, Vol.57 (11), p.1040-1043
Main Authors: Schneibel, J.H., Liu, C.T., Hoelzer, D.T., Mills, M.J., Sarosi, P., Hayashi, T., Wendt, U., Heyse, H.
Format: Article
Language:English
Subjects:
Alloy development
Alloy powders
Density
DISPERSION HARDENING
Dispersion hardening alloys
GRAIN BOUNDARIES
Grain Growth
GRAIN SIZE
High temperature deformation
IRON BASE ALLOYS
MATERIALS SCIENCE
Mechanical alloying
Nanocomposites
Nanomaterials
Nanostructure
Oxide dispersion strengthening
Oxide dispersion strengthening (ODS)
Oxides
PORE STRUCTURE
POROSITY
Steels
YTTRIUM OXIDES
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Summary:The development of porosity at 1000 °C in an oxide dispersion-strengthened ferritic alloy containing nanoscale (∼2–4 nm) oxide particles is investigated. A comparison with an alloy fabricated by internal oxidation instead of mechanical alloying demonstrates that the porosity formation is associated with mechanical alloying of the alloy powder with Y 2O 3 in argon. The pores grow in spite of a submicron grain size suggesting that the grain boundaries are not effective paths for removing entrapped gas from the pores.
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2007.07.029