Microstructure and composition evolution of SPPs in the oxide film of Zr-1.0Sn-0.25Nb-0.2Fe-0.1Cr during corrosion

IF 7.9 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Materials & Design Pub Date : 2025-03-11 DOI:10.1016/j.matdes.2025.113830

Tianguo Wei , Xun Dai , Yi Zhao , Dong Wang , Yufeng Du , JiYun Zheng , Chongsheng Long , Chao Sun

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Abstract

The microstructure and composition evolution of SPPs in the oxide film of Zr-1.0Sn-0.25Nb-0.2Fe-0.1Cr alloy during aqueous corrosion at 360 °C is investigated by HRTEM. The results show that SPPs with their distances to the O-M interface less than 500 nm remain metallic and exhibit similar structure and composition as those in Zr matrix. However, the SPPs with their distances to the O-M interface more than 1 μm exhibit obvious oxidation, characterized by the high O content and the appearance of the oxides of Fe, Cr and Zr inside the SPPs. The cracks connected to the SPPs could provide a good O supply and enhance the oxidation of the SPPs. Such cracks also promote the outwards diffusion of Fe and Cr from the SPPs during oxidation. In the oxidized Zr(FeCrNb)₂ particles, Fe has a faster outwards diffusion rate than Cr, while Nb seems to be almost immobile. Under certain conditions, small oxidized SPPs will leave porous regions within the oxide film locally. Tetragonal ZrO₂ is observed occasionally nearby the oxidized SPPs, which is thought to be caused by the doping effect of Fe depleted from the dissolved SPPs.

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腐蚀过程中Zr-1.0Sn-0.25Nb-0.2Fe-0.1Cr氧化膜中SPPs的组织及成分演变

采用HRTEM研究了Zr-1.0Sn-0.25Nb-0.2Fe-0.1Cr合金在360℃水溶液腐蚀过程中氧化膜中SPPs的组织和成分演变。结果表明，当SPPs与O-M界面的距离小于500 nm时，其结构和组成与Zr基体相似。而与O- m界面距离大于1 μm的spp则表现出明显的氧化反应，表现为高O含量，spp内部出现Fe、Cr和Zr的氧化物。与spp连接的裂纹可以提供良好的O供应，并增强spp的氧化。在氧化过程中，这些裂纹还促进了Fe和Cr从spp向外扩散。在氧化后的Zr(FeCrNb)2颗粒中，Fe的向外扩散速率比Cr快，而Nb几乎不动。在一定条件下，小的氧化spp会在氧化膜内局部留下多孔区域。在氧化的spp附近偶见四方ZrO2，这被认为是由溶解的spp中Fe的掺杂效应引起的。

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来源期刊

Materials & Design Engineering-Mechanical Engineering

CiteScore

14.30

自引率

7.10%

发文量

1028

审稿时长

85 days

期刊介绍： Materials and Design is a multi-disciplinary journal that publishes original research reports, review articles, and express communications. The journal focuses on studying the structure and properties of inorganic and organic materials, advancements in synthesis, processing, characterization, and testing, the design of materials and engineering systems, and their applications in technology. It aims to bring together various aspects of materials science, engineering, physics, and chemistry. The journal explores themes ranging from materials to design and aims to reveal the connections between natural and artificial materials, as well as experiment and modeling. Manuscripts submitted to Materials and Design should contain elements of discovery and surprise, as they often contribute new insights into the architecture and function of matter.