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Application of Combustion Synthesis to the Production of Actinide Bearing Nitride Ceramic Nuclear Fuels
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A Molecular Dynamics Study of Helium-Vacancy Clusters Production due to Cascades in α-Iron
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Formation of Defect Clusters in SrTiO3 Crystals Implanted with Xenon Ions
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EXAFS Study on Irradiated ODS Ferritic Steel
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In Situ TEM Observation of Precipitation of Zirconium Hydrides in Zircaloy-4 under Hydrogen Ion Implantation
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Localized Deformation in Neutron-Irradiated Zirconium and Zircaloy-4
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Effects of Neutron Irradiation and Thermal Aging on Mechanical Properties of ODS Ferritic Steels for Advanced Nuclear Systems
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Fabrication and Evaluation of Plasma-Sprayed Molybdenum for Plasma Facing Materials
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Experiment and FEM Simulation on Residual Stress of Cold Expansion Hole
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In Situ TEM Observation of Precipitation of Zirconium Hydrides in Zircaloy-4 under Hydrogen Ion Implantation

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Abstract:

The formation of hydrides in zirconium alloy has been one of the essential matters of discussion to maintain mechanical strength of nuclear fuel cladding tubes. In this work, we examined the precipitation process of zirconium hydride by transmission electron microscopy under hydrogen ion irradiation. Zircaloy-4, which has been used extensively as nuclear fuel cladding, was irradiated with hydrogen ion at room temperature to achieve enough hydrogen concentration for precipitation. The growth of hydrides accompanied with dislocations around hydrides was observed under hydrogen implantation. The observed hydride was the γ-hydride phase with fct structure and the orientation relationship was <110>γ ||<1120>α as reported previously. As the hydride grew, the dislocations were generated gradually. This process can be explained using a ratchet mechanism suggested by Carpenter. The growth rate became lower according to the approach of other hydrides. This behavior is considered to be influenced by the strain field caused by other hydrides.

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Periodical:

Materials Science Forum (Volumes 561-565)

Pages:

1765-1768

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.561-565.1765

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Online since:

October 2007

Authors:

Yasunari Shinohara, Hiroaki Abe, Toshiya Kido, Takeo Iwai, Naoto Sekimura

Keywords:

Hydrides, Hydrogen, Implantation, Ion, TEM, Zircaloy-4

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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