Oxide Layers on (0001) Plane of Zircaloy-4 After Corrosion at 360 °C in Lithiated Aqueous Solution |
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Authors: | Shao-Qiu Gou Bang-Xin Zhou Mei-Yi Yao Jian-Chao Peng Chuan-Ming Chen Qiang Li Jin-Long Zhang |
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Affiliation: | (1)Institute of Materials, Shanghai University, Shanghai, 200072, China(2)Laboratory for Microstructures, Shanghai University, Shanghai, 200444, China |
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Abstract: | The microstructures of the oxide layers formed on near (0001) plane of Zircaloy-4 were investigated by autoclave tests at 360 °C in lithiated aqueous solution. Oxygen-rich regions with hcp structure were observed at the undulating O/M interface, and the inner surface morphology of the oxide layers formed on (0001) was only concave-convex. Monoclinic, tetragonal and cubic phases and a kind of zirconium sub-oxide with bcc structure were detected in the oxide layer near the metal matrix. This zirconium sub-oxide layer had a coherent relationship with α-Zr matrix, and the growth direction of the zirconium sub-oxide layer was nearly parallel to the [0001] direction of α-Zr regardless of the orientation of metal matrix. The orientations scattering of columnar grains formed on near (0001) plane differ from that formed on near () plane. |
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Keywords: | Zircaloy-4 (0001) plane Oxide/metal interfaces Microstructure Oxygen-rich regions Zirconium sub-oxide |
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