The role of alloying elements in the initiation of nanoscale porosity in oxide films formed on zirconium alloys

Gong, Weijia; Zhang, Hailong; Wu, Congfeng; Tian, Hao; Wang, Xitao

doi:10.1016/j.corsci.2013.08.006

Cited by 46 publications

(17 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…All these factors depend on the oxidation temperature and time, composition and fugacity of a medium, and chemical and phase composition of an alloy [23]. The obtained results here correspond to the previous reports regarding the temperature dependence of the oxide layer growth [25,[61][62][63][64][65][66][67], the complex multilayer and multiphase structure [68][69][70][71], growth of the oxide layer in columnar grains [68,72], and the appearance of porosity [25,33,[73][74][75] and cracks [76][77][78][79]. Interestingly, it was also noted that a severe descaling of the oxide layer appeared in these investigations at a relatively high temperature.…”

Section: Characteristics Of Oxide Layerssupporting

confidence: 88%

“…An initially high hydrogen absorption rate may decrease with increasing oxide thickness up to the oxide phase transition region [2]. The oxide pores provide short circuits for oxygen and hydrogen diffusion [33], as well as the sites to form molecular hydrogen [34]. A presence of oxygen may affect hydrogen absorption, as hydrogen can be trapped by oxygen atoms positioned along the preferred path creating the O-H bonds [28,35].The presence of hydrogen has diverse effects on mechanical properties, which are related to hydrogen content and temperature.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Hydrogen Embrittlement and Oxide Layer Effect in the Cathodically Charged Zircaloy-2

et al. 2020

View full text Add to dashboard Cite

The present paper is aimed at determining the less investigated effects of hydrogen uptake on the microstructure and the mechanical behavior of the oxidized Zircaloy-2 alloy. The specimens were oxidized and charged with hydrogen. The different oxidation temperatures and cathodic current densities were applied. The scanning electron microscopy, X-ray electron diffraction spectroscopy, hydrogen absorption assessment, tensile, and nanoindentation tests were performed. At low oxidation temperatures, an appearance of numerous hydrides and cracks, and a slight change of mechanical properties were noticed. At high-temperature oxidation, the oxide layer prevented the hydrogen deterioration of the alloy. For nonoxidized samples, charged at different current density, nanoindentation tests showed that both hardness and Young’s modulus revealed the minims at specific current value and the stepwise decrease in hardness during hydrogen desorption. The obtained results are explained by the barrier effect of the oxide layer against hydrogen uptake, softening due to the interaction of hydrogen and dislocations nucleated by indentation test, and hardening caused by the decomposition of hydrides. The last phenomena may appear together and result in hydrogen embrittlement in forms of simultaneous hydrogen-enhanced localized plasticity and delayed hydride cracking.

show abstract

Section: Characteristics Of Oxide Layerssupporting

confidence: 88%

mentioning

confidence: 99%

Hydrogen Embrittlement and Oxide Layer Effect in the Cathodically Charged Zircaloy-2

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Some researchers proposed that the interlinked porosity at grain boundaries plays an important role for the transition in oxidation kinetics 1,11) . In our samples, some voids, CORROSION SCIENCE AND TECHNOLOGY Vol.14, No.6, 2015 which seem to be interlinked, were observed in the oxide near the water/oxide interface.…”

Section: Discussionmentioning

confidence: 99%

“…Ni et al reported the interconnected nano-pores along the grain boundaries in the oxide and concluded that development of interlinked porosity down to the metal/oxide interface is a key mechanism for the transition in oxidation kinetics 1) . Gong et al also reported nano-pores in strings formed on Zr-Nb-Y alloy and N18 alloy (Zr-0.39Nb-0.93Sn-0.31Fe-0.08Cr-0.048O) at grain boundaries, and they suggested that initiation mechanism of porosity is Kirkendall effect 11) . In the oxide, columnar grains are more dominant in the inner part and equiaxed grains are frequently observed at the oxide surface.…”

Section: Introductionmentioning

confidence: 99%

Transmission Electron Microscopy Characterization of Early Pre-Transition Oxides Formed on ZIRLO^TM

Bae¹,

Kim²,

Kim³

et al. 2015

Corrosion Science and Technology

View full text Add to dashboard Cite

Corrosion of zirconium fuel cladding is known to limit the lifetime and reloading cycles of fuel in nuclear reactors. Oxide layers formed on ZIRLO TM cladding samples, after immersion for 300-hour and 50-day in a simulated primary water chemistry condition (360 o C and 20 MPa), were analyzed by using the scanning transmission electron microscopy (STEM), in-situ transmission electron microscopy (in-situ TEM) with the focused ion beam (FIB) technique, and X-ray diffraction (XRD). Both samples (immersion for 300 hours and 50 days) revealed the presence of the ZrO sub-oxide phase at the metal/oxide interface and columnar grains developed perpendicularly to the metal/oxide interface. Voids and micro-cracks were also detected near the water/oxide interface, while relatively large lateral cracks were found just above the less advanced metal/oxide interface. Equiaxed grains were mainly observed near the water/oxide interface.

show abstract

“…So far, the recognized alloying elements for such materials include Nb, Sn, Fe, Cr, O etc. Due to the limited solubility of alloying elements in α-Zr, most of them tend to precipitate as second phase particles (SPPs), which strongly influences the properties of Zr alloys [1][2][3][4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

On the oxidation behavior of (Zr,Nb)2Fe under simulated nuclear reactor conditions

Yang

Cao

et al. 2016

Corrosion Science

View full text Add to dashboard Cite

The corrosion behavior of Zr alloys was affected by second phases, especially by those containing Fe and Nb. Ti 2 Ni-type (Zr,Nb) 2 Fe compound was melted and exposed to H 2 O 2 water solution at 320 °C and 16.4 MPa for 60 hours. The oxide layer was analyzed by X-ray diffraction and high-resolution transmission electron microscope (HRTEM). The formation of nano-crystalline tetragonal ZrO 2 (Fe-rich area) and amorphous ZrO 2 (Fe-deficient area) was observed. HRTEM analysis identified α-Fe could stabilize tetragonal ZrO 2 due to the epitaxial growth.ZrxFeyNb alloys with different iron were melted and corroded similarly. The result was consistent with the proposed mechanism.

show abstract

The role of alloying elements in the initiation of nanoscale porosity in oxide films formed on zirconium alloys

Cited by 46 publications

References 23 publications

Hydrogen Embrittlement and Oxide Layer Effect in the Cathodically Charged Zircaloy-2

Hydrogen Embrittlement and Oxide Layer Effect in the Cathodically Charged Zircaloy-2

Transmission Electron Microscopy Characterization of Early Pre-Transition Oxides Formed on ZIRLO^TM

On the oxidation behavior of (Zr,Nb)2Fe under simulated nuclear reactor conditions

Contact Info

Product

Resources

About

The role of alloying elements in the initiation of nanoscale porosity in oxide films formed on zirconium alloys

Cited by 46 publications

References 23 publications

Hydrogen Embrittlement and Oxide Layer Effect in the Cathodically Charged Zircaloy-2

Hydrogen Embrittlement and Oxide Layer Effect in the Cathodically Charged Zircaloy-2

Transmission Electron Microscopy Characterization of Early Pre-Transition Oxides Formed on ZIRLOTM

On the oxidation behavior of (Zr,Nb)2Fe under simulated nuclear reactor conditions

Contact Info

Product

Resources

About

Transmission Electron Microscopy Characterization of Early Pre-Transition Oxides Formed on ZIRLO^TM