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

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

Materials & Design (Apr 2025)

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

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

Affiliations

Tianguo Wei: National Key Laboratory of Nuclear Reactor Technology, Nuclear Power Institute of China, Chengdu 610213, China; Corresponding authors at: National Key Laboratory of Nuclear Reactor Technology, Nuclear Power Institute of China, Chengdu 610213, China.
Xun Dai: National Key Laboratory of Nuclear Reactor Technology, Nuclear Power Institute of China, Chengdu 610213, China
Yi Zhao: National Key Laboratory of Nuclear Reactor Technology, Nuclear Power Institute of China, Chengdu 610213, China; State Key Laboratory of Advanced Nuclear Energy Technology, Nuclear Power Institute of China, Chengdu 610213, China
Dong Wang: National Key Laboratory of Nuclear Reactor Technology, Nuclear Power Institute of China, Chengdu 610213, China
Yufeng Du: National Key Laboratory of Nuclear Reactor Technology, Nuclear Power Institute of China, Chengdu 610213, China
JiYun Zheng: National Key Laboratory of Nuclear Reactor Technology, Nuclear Power Institute of China, Chengdu 610213, China
Chongsheng Long: National Key Laboratory of Nuclear Reactor Technology, Nuclear Power Institute of China, Chengdu 610213, China
Chao Sun: National Key Laboratory of Nuclear Reactor Technology, Nuclear Power Institute of China, Chengdu 610213, China; State Key Laboratory of Advanced Nuclear Energy Technology, Nuclear Power Institute of China, Chengdu 610213, China; Corresponding authors at: National Key Laboratory of Nuclear Reactor Technology, Nuclear Power Institute of China, Chengdu 610213, China.

Journal volume & issue: Vol. 252
p. 113830

Abstract

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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.

Published in Materials & Design

ISSN: 0264-1275 (Print); 1873-4197 (Online)
Publisher: Elsevier
Country of publisher: United Kingdom
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials
Website: https://www.journals.elsevier.com/materials-and-design

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