A hydrogen uptake micro-mechanism for Zr alloys

Cox, B.; Wong, Y.-M.

doi:10.1016/s0022-3115(98)00898-8

Cited by 63 publications

(31 citation statements)

References 24 publications

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“…It remains unclear whether the SPPs act as traps for H, provide nucleation sites for hydrides, or whether they may act as a preferred transport path through the outer oxide layer for ingress of H into the metal [6,7].…”

Section: Introductionmentioning

confidence: 99%

Hydrogen solubility in zirconium intermetallic second phase particles

Burr

Murphy

Lumley

et al. 2013

Journal of Nuclear Materials

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The enthalpies of solution of H in Zr binary intermetallic compounds formed with Cu, Cr, Fe, Mo, Ni, Nb, Sn and V were calculated by means of density functional theory simulations and compared to that of H in α-Zr. It is predicted that all Zr-rich phases (formed with Cu, Fe, Ni and Sn), and those phases formed with Nb and V, offer lower energy, more stable sites for H than α-Zr. Conversely, Mo and Cr containing phases do not provide preferential solution sites for H. In all cases the most stable site for H are those that offer the highest coordination fraction of Zr atoms. Often these are four Zr tetrahedra but not always. Implications with respect to H-trapping properties of commonly observed ternary phases such as Zr(Cr,Fe) 2 , Zr 2 (Fe,Ni) and Zr(Nb,Fe) 2 are also discussed.

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Section: Introductionmentioning

confidence: 99%

Hydrogen solubility in zirconium intermetallic second phase particles

Burr

Murphy

Lumley

et al. 2013

Journal of Nuclear Materials

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“…3,4) For a tubular component internally pressurized in service, it is desirable to have the hydride platelets oriented with their major axis in the circumferential direction. Hydride orientation is to a large extent determined by the manufacturing process, which has a great influence on the texture and the shape and size of grains.…”

Section: )mentioning

confidence: 99%

Reorientation of Hydrides and Its Effect on the Mechanical Properties of Zr-Nb-Sn-Fe Cladding Tubes

Lee¹,

Choi

Joo

et al. 2005

Journal of Nuclear Science and Technology

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The reorientation of hydrides and its effect on the fracture of Zr-Nb-Sn-Fe cladding tubes were investigated. The reorientation of hydrides along the radial direction was most pronounced if the tube was cooled from 573 to 473 K under circumferential loading. Reorientation occurred much less frequently at either higher (from 673 to 573 K) or lower (from 473 to 373 K) temperature range. The strength decreased to 250 MPa and the ductility decreased to zero in the tube which was reorientation-treated from 573 to 473 K (RS32AC). Fracture surface of RS32AC sample exhibited flat cleavage fracture along the radial hydride platelet. The reorientation of hydrides was also found to increase with increase of loading time, suggesting time dependent stress-aided dissolution of circumferential hydrides and reprecipitation of radial hydrides.

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“…DFT calculations found that under 1GPa compressive stress hydrogen diffusion coefficient in tetragonal ZrO 2 is only about 60% of the coefficient without stress at 600 K 15 . It is worth noting that there is also literature arguing that the diffusion of hydrogen through the barrier oxide layer is not the rate-limiting step 21,22 . Evidence from the chemical exchange experiments 17 and transmission electron microscope (TEM) analysis 23 suggests that micro pores/cracks exist even in the dense oxide layer.…”

Section: Introductionmentioning

confidence: 99%

Continuum model for hydrogen pickup in zirconium alloys of LWR fuel cladding

Wang

Zheng

Szlufarska

et al. 2017

Journal of Applied Physics

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A continuum model for calculating the time-dependent hydrogen pickup fractions in various Zirconium alloys under steam and pressured water oxidation has been developed in this study. Using only one fitting parameter, the effective hydrogen gas partial pressure at the oxide surface, a qualitative agreement is obtained between the predicted and previously measured hydrogen pickup fractions. The calculation results therefore demonstrate that H diffusion through the dense oxide layer plays an important role in the hydrogen pickup process. The limitations and possible improvement of the model are also discussed.

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A hydrogen uptake micro-mechanism for Zr alloys

Cited by 63 publications

References 24 publications

Hydrogen solubility in zirconium intermetallic second phase particles

Hydrogen solubility in zirconium intermetallic second phase particles

Reorientation of Hydrides and Its Effect on the Mechanical Properties of Zr-Nb-Sn-Fe Cladding Tubes

Continuum model for hydrogen pickup in zirconium alloys of LWR fuel cladding

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