Breakaway phenomenon of Zr-based alloys during a high-temperature oxidation

Baek, Jeong‐In; Jeong, Yong Hwan

doi:10.1016/j.jnucmat.2007.02.011

Cited by 77 publications

(27 citation statements)

References 14 publications

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“…As [7,8] have shown hydrogen concentration in the remaining zirconium alloy is strongly influenced by the stability of the oxide layer formed during steam oxidation. At certain temperatures depending on the alloy composition the oxide growth starts with an undercooled tetragonal structure.…”

Section: Introductionmentioning

confidence: 99%

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Influence of oxide layer morphology on hydrogen concentration in tin and niobium containing zirconium alloys after high temperature steam oxidation

Große

Lehmann

Steinbrück

et al. 2009

Journal of Nuclear Materials

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Section: Introductionmentioning

confidence: 99%

“…The hydrogen uptake of the remaining zirconium alloy during isothermal steam oxidation was studied experimentally in [5][6][7][8][9]. As [7,8] have shown hydrogen concentration in the remaining zirconium alloy is strongly influenced by the stability of the oxide layer formed during steam oxidation.…”

Section: Introductionmentioning

confidence: 99%

Influence of oxide layer morphology on hydrogen concentration in tin and niobium containing zirconium alloys after high temperature steam oxidation

Große

Lehmann

Steinbrück

et al. 2009

Journal of Nuclear Materials

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“…The appearance of breakaway oxidation depends on temperature, environment and alloy composition. The breakaway oxidation in steam (without nitrogen) occurs at temperatures up to 1300K [10] and after time ranged between 2400 and 5500 s [6]. In other research on the same alloy, the oxide layer was indeed compact at 1200°C, even if the oxide scale formed at 1000°C indicated breakaway phenomena [11].…”

Section: Oxidationmentioning

confidence: 90%

“…In another research on the Zircaloy-4, the monoclinic and the tetragonal phases were formed already at 350°C temperature [5]. At temperatures of 950-1200ºC both crystallographic structures of an oxide phase may be still present [6]. Both phases may then appear at moderate temperatures.…”

Section: Oxidationmentioning

confidence: 95%

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Hydrogen degradation of pre-oxidized zirconium alloys

Szoka

Gajowiec

Zieliński

et al. 2017

Advances in Materials Science

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The presence of the oxide layers on Zr alloys may retard or enhance the hydrogen entry and material degradation, depending on the layer features. This research has been aimed to determine the effects of preoxidation of the Zircaloy-2 alloy at a different temperature on hydrogen degradation. The specimens were oxidised in laboratory air at 350ºC, 700ºC, and 900ºC. After, some samples were tensed at 10-5 strain rate and simultaneously charged with hydrogen under constant direct voltage in 1 N sulfuric acid at room temperature. Other specimens were charged without any tension, then annealed at 400ºC for 4 h and finally tensed at above strain rate. The SEM examinations were performed on the cross-sections and fracture faces of specimens. The obtained results demonstrate the effects of the oxide layer on the cathodic current and hydrogen entry, mechanical properties and the appearance of hydrides and fracture behaviour.

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High‐Temperature Mechanical Behavior of Single‐Crystal FeCrAl Alloy Under In Situ Micropillar Compression

Sun,

Niu,

Shang

et al. 2024

Adv Eng Mater

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FeCrAl cladding is one of the candidate materials for the near‐term accident‐tolerant fuel technologies under development. Research on high‐temperature mechanical behaviors of single‐crystal FeCrAl alloy is rather limited. Previous studies have reported the mechanical property of low‐index orientation in single‐crystal FeCrAl alloy at room temperature. However, the critical resolved shear stress to activate slip systems can be orientation and temperature dependent. Here, single‐crystal grains in a coarse‐grained FeCrAl alloy with different crystallographic orientations are selected to preferentially activate {110}<111> slip systems or {112}<111> slip systems. Micropillars are fabricated in the selected single‐crystal grains and tested at elevated temperatures in situ in a scanning electron microscope. The critical resolved shear stresses of {110}<111> slip systems and {112}<111> slip systems are determined at various temperatures. The critical resolved shear stress shows a temperature dependence and orientation independence. This study provides important insight for understanding the deformation mechanisms of FeCrAl alloys at elevated temperatures.

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Breakaway phenomenon of Zr-based alloys during a high-temperature oxidation

Cited by 77 publications

References 14 publications

Influence of oxide layer morphology on hydrogen concentration in tin and niobium containing zirconium alloys after high temperature steam oxidation

Influence of oxide layer morphology on hydrogen concentration in tin and niobium containing zirconium alloys after high temperature steam oxidation

Hydrogen degradation of pre-oxidized zirconium alloys

High‐Temperature Mechanical Behavior of Single‐Crystal FeCrAl Alloy Under In Situ Micropillar Compression

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