Chemical characterization of uniform and localized oxides formed on Zr-2.5 (wt. %) Nb alloy

IF 3.2 2区工程技术 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Journal of Nuclear Materials Pub Date : 2025-02-01 Epub Date: 2024-11-29 DOI:10.1016/j.jnucmat.2024.155546

Akanksha Samanta , Suparna Banerjee , Rekha Rao , V. Srikanth , Y. Sunitha , Santu Kaity , J.V. Ramana , A.K. Tyagi

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Abstract

Uniform and localized oxide morphologies formed on Zr-2.5(wt.%) Nb alloy in water and steam environments have been studied using electron microscopy techniques such as SEM and EPMA. The uniform oxidation was characterized by a compact and thin oxide layer. In contrast, the nodules showed localized thicker oxide growth with cracked and porous morphology. Significant segregation of Nb at the surface of the oxide nodule was observed, leading to destabilization and spallation of the oxide. The chemical states of Zr, Nb, and O in the two types of oxides were analyzed by XPS. The atomic composition of oxides in terms of O and M fractions was evaluated by p-EBS. The study revealed the oxide nodule to be richer in oxygen in comparison to the surrounding uniform oxide. The phase characteristics of these oxides were studied by Raman spectroscopy. The effect of initial surface in-homogeneities on nodule nucleation has been discussed. Polishing made the surface free of initial in-homogeneities and resulted in uniform oxidation on the surface.

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Zr-2.5 (wt. %) Nb合金上形成均匀和局部氧化物的化学性质

利用SEM和EPMA等电子显微镜技术研究了Zr-2.5(wt.%) Nb合金在水和蒸汽环境中形成的均匀和局部氧化形态。均匀氧化的特点是氧化层致密而薄。相反，结核表现出局部较厚的氧化物生长，具有裂纹和多孔形态。在氧化结核表面观察到Nb的明显偏析，导致氧化物的不稳定和剥落。用XPS分析了两种氧化物中Zr、Nb和O的化学态。用p-EBS评价了O和M组分的氧化物的原子组成。研究表明，与周围均匀的氧化物相比，氧化结节含有更丰富的氧气。用拉曼光谱研究了这些氧化物的物相特性。讨论了初始表面非均匀性对结核成核的影响。抛光使表面摆脱了最初的不均匀性，并导致表面均匀氧化。

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来源期刊

Journal of Nuclear Materials 工程技术-材料科学：综合

CiteScore

5.70

自引率

25.80%

发文量

601

审稿时长

63 days

期刊介绍： The Journal of Nuclear Materials publishes high quality papers in materials research for nuclear applications, primarily fission reactors, fusion reactors, and similar environments including radiation areas of charged particle accelerators. Both original research and critical review papers covering experimental, theoretical, and computational aspects of either fundamental or applied nature are welcome. The breadth of the field is such that a wide range of processes and properties in the field of materials science and engineering is of interest to the readership, spanning atom-scale processes, microstructures, thermodynamics, mechanical properties, physical properties, and corrosion, for example. Topics covered by JNM Fission reactor materials, including fuels, cladding, core structures, pressure vessels, coolant interactions with materials, moderator and control components, fission product behavior. Materials aspects of the entire fuel cycle. Materials aspects of the actinides and their compounds. Performance of nuclear waste materials; materials aspects of the immobilization of wastes. Fusion reactor materials, including first walls, blankets, insulators and magnets. Neutron and charged particle radiation effects in materials, including defects, transmutations, microstructures, phase changes and macroscopic properties. Interaction of plasmas, ion beams, electron beams and electromagnetic radiation with materials relevant to nuclear systems.