Role of Intermetallic Precipitates in Hydrogen Uptake of Zircaloy-2.

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  • HATANO Yuji
    Department of Nuclear Engineering, Faculty of Engineering, Kyushu University
  • ISOBE Kanetsugu
    Department of Nuclear Engineering, Faculty of Engineering, Kyushu University
  • HITAKA Ryuji
    Department of Nuclear Engineering, Faculty of Engineering, Kyushu University
  • SUGISAKI Masayasu
    Department of Nuclear Engineering, Faculty of Engineering, Kyushu University

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  • Role of Intermetallic Precipitates in H

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The hydrogen uptake behavior of two types of Zircaloy-2 specimens containing either fine intermetallic precipitates or coarse ones was studied at 623-723K in the pre-transition period of oxidation to clarify the role of the precipitates in the hydrogen transport through the oxide film. In the former case, the amount of hydrogen taken up was small and did not show the oxidation temperature dependence. In the latter case, the amount of hydrogen taken up was large and dependent markedly upon the oxidation temperature; it increased with decreasing oxidation temperature. These results were successfully explained with the model that the intermetallic precipitates remaining in a metallic state in the oxide film act as the fast transport route of hydrogen.

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