Advanced oxide dispersion strengthened and nanostructured ferritic alloys

M. K. Miller; C. M. Parish; Q. Li

doi:10.1179/1743284713Y.0000000207

Advanced oxide dispersion strengthened and nanostructured ferritic alloys

M. K. Miller, C. M. Parish, Q. Li

Nuclear Energy Materials Microanalysis

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Abstract

Nanostructured ferritic alloy is a subcategory of oxide dispersion strengthened steels intended for advanced reactor applications. The complex ultrafine grained microstructure of an advanced nanostructured ferritic alloy, as determined by electron microscopy and atom probe tomography, is summarised. Three distinct populations of precipitates were observed: 20-50 nm Ti(N,O,C), 5-10 nm diameter Y₂Ti₂O₇/Y₂TiO ₅ and 1-4 nm diameter Ti,Y,O enriched nanoclusters. The first two populations were predominantly located along grain boundaries together with Cr, W and C segregation. A dense population of nanoclusters was observed both in the grain interior as well as on the grain boundaries. These nanoclusters are highly tolerant to high dose irradiation at elevated temperatures.

Original language	English
Pages (from-to)	1174-1178
Number of pages	5
Journal	Materials Science and Technology (United Kingdom)
Volume	29
Issue number	10
DOIs	https://doi.org/10.1179/1743284713Y.0000000207
State	Published - Oct 2013

Keywords

Atom probe tomography
Grain boundaries
Nanoclusters
Nanostructured ferritic alloys
Oxide dispersion strengthened alloys
Review

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10.1179/1743284713Y.0000000207

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abstract = "Nanostructured ferritic alloy is a subcategory of oxide dispersion strengthened steels intended for advanced reactor applications. The complex ultrafine grained microstructure of an advanced nanostructured ferritic alloy, as determined by electron microscopy and atom probe tomography, is summarised. Three distinct populations of precipitates were observed: 20-50 nm Ti(N,O,C), 5-10 nm diameter Y2Ti2O7/Y2TiO 5 and 1-4 nm diameter Ti,Y,O enriched nanoclusters. The first two populations were predominantly located along grain boundaries together with Cr, W and C segregation. A dense population of nanoclusters was observed both in the grain interior as well as on the grain boundaries. These nanoclusters are highly tolerant to high dose irradiation at elevated temperatures.",

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AB - Nanostructured ferritic alloy is a subcategory of oxide dispersion strengthened steels intended for advanced reactor applications. The complex ultrafine grained microstructure of an advanced nanostructured ferritic alloy, as determined by electron microscopy and atom probe tomography, is summarised. Three distinct populations of precipitates were observed: 20-50 nm Ti(N,O,C), 5-10 nm diameter Y2Ti2O7/Y2TiO 5 and 1-4 nm diameter Ti,Y,O enriched nanoclusters. The first two populations were predominantly located along grain boundaries together with Cr, W and C segregation. A dense population of nanoclusters was observed both in the grain interior as well as on the grain boundaries. These nanoclusters are highly tolerant to high dose irradiation at elevated temperatures.

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Advanced oxide dispersion strengthened and nanostructured ferritic alloys

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