Nanoindentation studies of high-temperature oxidized Zircaloy-4 with and without hydrogen

Ito, Masato; Muta, Hiroaki; Setoyama, Daigo; Uno, Masayoshi; Yamanaka, Shinşuke

doi:10.1016/j.jallcom.2007.02.070

Cited by 9 publications

(2 citation statements)

References 17 publications

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“…The nanoindentation measurements were helpful in the past to recognize the mechanisms of hydrogen embrittlement for many metals. Such attempts were performed not only for Zr alloys [44][45][46][47][48]101], but also for iron single crystal [102], carbon steel [103], manganese steel [104,105], austenitic steel [106], super-duplex steel [107], nitrided steel [108], Al [109], V [110], Ni [111][112][113], Pd [113], and Ni-Nb-Zr [112], CoCrFeMn [114] and Fe-3Si [115] alloys.…”

Section: Hydrogen Influence On Nanomechanical Propertiesmentioning

confidence: 99%

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

et al. 2020

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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.

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Section: Hydrogen Influence On Nanomechanical Propertiesmentioning

confidence: 99%

“…Setoyama et al [44] observed that H absorption resulted in either hardness or softening, depending on H content. On the contrary, Ito et al [45] reported no difference in mechanical properties for the Zr alloy with or without hydrogen. According to Kuroda et al [46], the zirconium hydride possessed a higher nano-hardness, 4.3 GPa,…”

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confidence: 93%