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Mechanism of oxide particle evolution in the MA957 ODS ferritic alloy

Published online by Cambridge University Press:  15 March 2011

H. Sakasegawa ,
F. Legendre ,
L. Boulanger ,
L. Chaffron ,
T. Cozzika ,
J. Malaplate ,
J. Henry ,
Y. de Carlan  and
M. Brocq
H. Sakasegawa
Affiliation:
CEA Saclay DEN/DMN/SRMP, 91191 Gif sur Yvette cedex, France
F. Legendre
Affiliation:
CEA Saclay DEN/DMN/SRMP, 91191 Gif sur Yvette cedex, France
L. Boulanger
Affiliation:
CEA Saclay DEN/DMN/SRMP, 91191 Gif sur Yvette cedex, France
L. Chaffron
Affiliation:
CEA Saclay DEN/DMN/SRMA, 91191 Gif sur Yvette cedex, France
T. Cozzika
Affiliation:
CEA Saclay DEN/DMN/SRMA, 91191 Gif sur Yvette cedex, France
J. Malaplate
Affiliation:
CEA Saclay DEN/DMN/SRMA, 91191 Gif sur Yvette cedex, France
J. Henry
Affiliation:
CEA Saclay DEN/DMN/SRMA, 91191 Gif sur Yvette cedex, France
Y. de Carlan
Affiliation:
CEA Saclay DEN/DMN/SRMA, 91191 Gif sur Yvette cedex, France
M. Brocq
Affiliation:
CEA Saclay DEN/DMN/SRMP, 91191 Gif sur Yvette cedex, France
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Abstract

In our past work, two types of nanometer-sized oxide particle were found in the commercial ODS (Oxide Dispersion Strengthened) ferritic alloy MA957. They were nonstoichiometric Y-, Ti-, O-enriched clusters (2 ∼ 15 nm) and stoichiometric Y2Ti2O7 (15 ∼ 35 nm). The particles which have an important role for the strengthening were confirmed to be nonstoichiometric Y-, Ti-, O-enriched clusters (denoted by YxTiyOz in this work). Based on that result, the stability and evolution mechanism of oxide particle at high temperatures were studied in this work. After annealing (1473 K × 1 h), most of the non-stoichiometric YxTiyOz particles were stable and their size increased very little. However, some these particles apparently became Y2Ti2O7 particles with increasing size and yttrium content. They possibly contributed to the growth of Y2Ti2O7.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1125: Symposium R – Materials for Future Fusion and Fission Technologies , 2008 , 1125-R01-03
Copyright
Copyright © Materials Research Society 2009

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References

REFERENCES

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