The development and stability of Y-Ti-O nanoclusters in mechanically alloyed Fe-Cr based ferritic alloys

M. J. Alinger; G. R. Odette; D. T. Hoelzer

doi:10.1016/j.jnucmat.2004.04.042

The development and stability of Y-Ti-O nanoclusters in mechanically alloyed Fe-Cr based ferritic alloys

M. J. Alinger, G. R. Odette, D. T. Hoelzer

Alloy Behavior & Design

Research output: Contribution to journal › Conference article › peer-review

202 Scopus citations

Abstract

Ferritic alloys containing a high density of nanoscale clusters of Y-Ti-O exhibit superior creep strength and potential for high resistance to radiation damage. Small angle neutron scattering (SANS) was used to characterize the sequence-of-events and the necessary ingredients for the formation of nanoclusters (NCs) during processing, as well as their thermal stability during high temperature aging. Mechanical alloying (MA) dissolves Y₂O ₃ in the master alloy Fe-Cr-W powders. A large population of 1-2 nm NCs precipitate during subsequent high temperature consolidation. The NC sizes increase and their volume fractions and number densities decrease with increasing the consolidation temperature. Both Ti and Y are necessary for NC formation at higher temperatures. The NCs in MA957 are stable during aging at 1150°C for times up to 243 h, but systematically coarsen at 1200°C. The NCs coarsen rapidly and become unstable at higher aging temperatures. Variations in the alloy hardness are consistent with differences in the NC sizes and number densities.

Original language	English
Pages (from-to)	382-386
Number of pages	5
Journal	Journal of Nuclear Materials
Volume	329-333
Issue number	1-3 PART A
DOIs	https://doi.org/10.1016/j.jnucmat.2004.04.042
State	Published - Aug 1 2004
Event	Proceedings of the 11th Conference on Fusion Research - Kyoto, Japan Duration: Dec 7 2003 → Dec 12 2003

Funding

The authors gratefully acknowledge Doug Klingensmith (UCSB) for his contributions to the SANS experiments and Professor Brian Wirth (UC Berkeley) for his help in analysis of the SANS data. We acknowledge the support of the National Institute of Standards and Technology, US Department of Commerce, in providing facilities used in this work. This research was supported by DOE Office of Fusion Energy Science (Grant # DE-FG03-94ER54275) and the INERI DOE Office of Nuclear Energy through a subcontract with ORNL (Grant # 400014112).

Funders	Funder number
DOE Office of Fusion Energy Science	DE-FG03-94ER54275
INERI DOE Office of Nuclear Energy
National Institute of Standards and Technology
U.S. Department of Commerce
Oak Ridge National Laboratory	400014112

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title = "The development and stability of Y-Ti-O nanoclusters in mechanically alloyed Fe-Cr based ferritic alloys",

abstract = "Ferritic alloys containing a high density of nanoscale clusters of Y-Ti-O exhibit superior creep strength and potential for high resistance to radiation damage. Small angle neutron scattering (SANS) was used to characterize the sequence-of-events and the necessary ingredients for the formation of nanoclusters (NCs) during processing, as well as their thermal stability during high temperature aging. Mechanical alloying (MA) dissolves Y2O 3 in the master alloy Fe-Cr-W powders. A large population of 1-2 nm NCs precipitate during subsequent high temperature consolidation. The NC sizes increase and their volume fractions and number densities decrease with increasing the consolidation temperature. Both Ti and Y are necessary for NC formation at higher temperatures. The NCs in MA957 are stable during aging at 1150°C for times up to 243 h, but systematically coarsen at 1200°C. The NCs coarsen rapidly and become unstable at higher aging temperatures. Variations in the alloy hardness are consistent with differences in the NC sizes and number densities.",

author = "Alinger, {M. J.} and Odette, {G. R.} and Hoelzer, {D. T.}",

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AU - Alinger, M. J.

AU - Odette, G. R.

AU - Hoelzer, D. T.

PY - 2004/8/1

Y1 - 2004/8/1

N2 - Ferritic alloys containing a high density of nanoscale clusters of Y-Ti-O exhibit superior creep strength and potential for high resistance to radiation damage. Small angle neutron scattering (SANS) was used to characterize the sequence-of-events and the necessary ingredients for the formation of nanoclusters (NCs) during processing, as well as their thermal stability during high temperature aging. Mechanical alloying (MA) dissolves Y2O 3 in the master alloy Fe-Cr-W powders. A large population of 1-2 nm NCs precipitate during subsequent high temperature consolidation. The NC sizes increase and their volume fractions and number densities decrease with increasing the consolidation temperature. Both Ti and Y are necessary for NC formation at higher temperatures. The NCs in MA957 are stable during aging at 1150°C for times up to 243 h, but systematically coarsen at 1200°C. The NCs coarsen rapidly and become unstable at higher aging temperatures. Variations in the alloy hardness are consistent with differences in the NC sizes and number densities.

AB - Ferritic alloys containing a high density of nanoscale clusters of Y-Ti-O exhibit superior creep strength and potential for high resistance to radiation damage. Small angle neutron scattering (SANS) was used to characterize the sequence-of-events and the necessary ingredients for the formation of nanoclusters (NCs) during processing, as well as their thermal stability during high temperature aging. Mechanical alloying (MA) dissolves Y2O 3 in the master alloy Fe-Cr-W powders. A large population of 1-2 nm NCs precipitate during subsequent high temperature consolidation. The NC sizes increase and their volume fractions and number densities decrease with increasing the consolidation temperature. Both Ti and Y are necessary for NC formation at higher temperatures. The NCs in MA957 are stable during aging at 1150°C for times up to 243 h, but systematically coarsen at 1200°C. The NCs coarsen rapidly and become unstable at higher aging temperatures. Variations in the alloy hardness are consistent with differences in the NC sizes and number densities.

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AN - SCOPUS:3342960908

SN - 0022-3115

VL - 329-333

SP - 382

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JO - Journal of Nuclear Materials

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ER -

The development and stability of Y-Ti-O nanoclusters in mechanically alloyed Fe-Cr based ferritic alloys

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