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Title: Influence of Zircaloy cladding composition on hydride formation during aqueous hydrogen charging

Authors:
; ORCiD logo; ; ; ORCiD logo
Publication Date:
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1396648
Grant/Contract Number:
AC04-94AL85000
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Journal of Nuclear Materials
Additional Journal Information:
Journal Volume: 489; Journal Issue: C; Related Information: CHORUS Timestamp: 2018-02-03 02:23:29; Journal ID: ISSN 0022-3115
Publisher:
Elsevier
Country of Publication:
Netherlands
Language:
English

Citation Formats

Rajasekhara, S., Kotula, P. G., Enos, D. G., Doyle, B. L., and Clark, B. G. Influence of Zircaloy cladding composition on hydride formation during aqueous hydrogen charging. Netherlands: N. p., 2017. Web. doi:10.1016/j.jnucmat.2016.04.055.
Rajasekhara, S., Kotula, P. G., Enos, D. G., Doyle, B. L., & Clark, B. G. Influence of Zircaloy cladding composition on hydride formation during aqueous hydrogen charging. Netherlands. doi:10.1016/j.jnucmat.2016.04.055.
Rajasekhara, S., Kotula, P. G., Enos, D. G., Doyle, B. L., and Clark, B. G. Thu . "Influence of Zircaloy cladding composition on hydride formation during aqueous hydrogen charging". Netherlands. doi:10.1016/j.jnucmat.2016.04.055.
@article{osti_1396648,
title = {Influence of Zircaloy cladding composition on hydride formation during aqueous hydrogen charging},
author = {Rajasekhara, S. and Kotula, P. G. and Enos, D. G. and Doyle, B. L. and Clark, B. G.},
abstractNote = {},
doi = {10.1016/j.jnucmat.2016.04.055},
journal = {Journal of Nuclear Materials},
number = C,
volume = 489,
place = {Netherlands},
year = {Thu Jun 01 00:00:00 EDT 2017},
month = {Thu Jun 01 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.jnucmat.2016.04.055

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  • The hydride-phase formation and its influence on the fatigue behavior of a Zircaloy-4 alloy charged with hydrogen gas are investigated. First, the microstructure and fatigue crack propagation rate of the alloy in the as-received condition are studied. Second, the formation and homogeneous distribution of delta zirconium hydride ( -ZrH2) in the bulk, and its effect on the fatigue crack propagation rate are presented. The results show that in the presence of hydrides the zirconium alloy exhibits reduced toughness and enhanced crack growth rates. Finally, the influence of a pre-existing fatigue crack in the specimen and the subsequent hydride formation weremore » investigated. The residual lattice strain profile around the fatigue crack tip was measured using neutron diffraction. The combined effects of residual strains and hydride precipitation on the fatigue behavior are discussed.« less
  • Several types of aluminium lithium hydrides can form when aluminium and lithium react with hydrogen. Dickenson et al. reported the precipitation of LiH in the subsurface region of Al-Li alloys on annealing in dry air, dry hydrogen and wet air at 550 C. Balasubramaniam et al. unambiguously identified, by transmission electron microscopy (TEM), the presence of LiAlH{sub 4} in an Al-Li-Cu alloy under SCC conditions. In the present study, the phase changes that occur on room temperature cathodic hydrogen charging of an Al-Li-Cu-Mg alloy have been investigated by X-ray diffraction (XRD). The diffraction peaks of LiH and LiAlH{sub 4} occurmore » at distinctly different locations, for example, the 100% peak for LiAlH{sub 4} occurs at 2{theta} = 22.9{degree} and the same for LiH occurs at 2{theta} = 44.4{degree}. Therefore, unambiguous identification of the hydride phase is possible.« less
  • The hydride embrittlement in ZIRCALOY-4 was studied at room temperature and 350 C. Sheet tensile specimens of two fabrication routes in the stress-relieved, recrystallized, and [beta]-treated states were hydrided with or without tensile stress. It was found generally that the effect on strength of increasing hydrogen content was not important. However, for the tensile tests at room temperature, there is a ductile-brittle transition when the hydrogen content is higher than a certain threshold. The prior thermomechanical treatment shifts this transition considerably. In situ scanning electron microscopy (SEM) tests, fractography, and fracture profile observations were carried out to determine the fracturemore » micromechanisms and the microscopic processes. At 20 C, the fracture surfaces are characterized by voids and secondary cracks for low and medium hydrogen contents and by intergranular cracks and decohesion through the continuous hydride network for high hydrogen contents. This phenomenon disappears at 350 C, and the hydrogen seems to exert no more influence on the fracture micromechanism even for very high hydrogen contents (up to 1,500 wt ppm). A full-coverage model is proposed to estimate the critical hydrogen content that makes ZIRCALOY-4 totally brittle. The effect of microstructure on hydride embrittlement in different metallurgical states is thus explained according to the modeling. Special attention is devoted to relating the micromechanisms and the modeling in order to propose the possible measures needed to limit the hydride embrittlement effect.« less