The dilatational misfit of zirconium hydrides precipitated in zirconium

Carpenter, G.J.C.

doi:10.1016/0022-3115(73)90022-6

Cited by 231 publications

(93 citation statements)

References 9 publications

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“…4a, d and e), the (0 0 0 1) a-Zr //{1 1 1} dZrH1.66 orientation relationship is found, which is also supported by the previous studies using electron backscattered diffraction (EBSD) [1,2] and Synchrotron [22] techniques. This hydride-matrix orientation correlation essentially results from the preferred lattice matching of the involved (0 0 0 1) a-Zr and {1 1 1} d-ZrH1.66 atomic planes [16]. Besides, the developed recrystallization basal and prismatic textures of a-Zr under vacuum and 15 atm hydrogen atmospheres are similar ( Fig.…”

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confidence: 73%

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Hydrogen-induced microstructure, texture and mechanical property evolutions in a high-pressure torsion processed zirconium alloy

Wang

Garbe

et al. 2012

Scripta Materialia

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confidence: 73%

“…1e). The hydrides precipitation during cooling introduces local stresses (due to hydrides volume expansion) and dislocations [16,17], contributing to the potential hardening effect of hydrides. The vacuum-annealed disc is further hydrided at 15 atm using the identical hydriding process for the HPT samples.…”

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confidence: 99%

Hydrogen-induced microstructure, texture and mechanical property evolutions in a high-pressure torsion processed zirconium alloy

Wang

Garbe

et al. 2012

Scripta Materialia

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“…This displacement is probably caused by the expected compressive stress from hydride precipitation because of the constraint of a-Zr grains, [13] as there is an appreciable volume expansion of 17.2 pct for d-hydride compared to the a-Zr matrix. [16] Such compressive stress within hydrides has already been manifested by the recent synchrotron X-ray diffraction experiments. [17] Moreover, at a relatively low hydriding pressure of 10 atm, the positions of the d-hydride peaks shifted slightly toward higher 2h in comparison with those of the standard hydride peaks, with the d(111) peak shifted by %0.048 deg and d(311) peak by %0.057 deg.…”

Section: A Phase Identification and Quantificationmentioning

confidence: 91%

Observations on the Zirconium Hydride Precipitation and Distribution in Zircaloy-4

Wang

Garbe

et al. 2013

Metall Mater Trans B

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Hydride precipitation and distribution in hot-rolled and annealed Zircaloy-4 plate samples artificially induced by gaseous hydrogen charging were studied primarily by neutron tomography, scanning electron microscopy (SEM), and SEM-based electron backscattered diffraction techniques. The precipitated hydride platelet (δ-ZrH1.66) at a hydrogen pressure of 20 atm was found following the {111}δ-ZrH1.66//(0001) α-Zr with the surrounding α-Zr matrix. The microstructural characterization indicated that hydrides with a relatively uniform distribution were precipitated on the rolling-transverse section of the plate, whereas, on the normaltransverse section, a hydride concentration gradient was present with a dense hydride layer near the surface. Further, the neutron tomography investigations clearly identified the nonuniform spatial distribution of hydrides. Thin hydride layers preferentially formed on the sample surface, and the concentrated hydrides precipitating at the edges/corner of the sample were observed. The causes for the localized hydride accumulation were also discussed. Disciplines Engineering | Science and Technology Studies Publication DetailsWang, Z., Garbe, U., Li, H., Harrison, R. P., Kaestner, A. & Lehmann, E. (2014 Hydride precipitation and distribution in hot-rolled and annealed Zircaloy-4 plate samples artificially induced by gaseous hydrogen charging were studied primarily by neutron tomography, scanning electron microscopy (SEM), and SEM-based electron backscattered diffraction techniques. The precipitated hydride platelet (d-ZrH 1.66 ) at a hydrogen pressure of 20 atm was found following the {111} d-ZrH1.66 //(0001) a-Zr with the surrounding a-Zr matrix. The microstructural characterization indicated that hydrides with a relatively uniform distribution were precipitated on the rolling-transverse section of the plate, whereas, on the normal-transverse section, a hydride concentration gradient was present with a dense hydride layer near the surface. Further, the neutron tomography investigations clearly identified the nonuniform spatial distribution of hydrides. Thin hydride layers preferentially formed on the sample surface, and the concentrated hydrides precipitating at the edges/ corner of the sample were observed. The causes for the localized hydride accumulation were also discussed.

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“…Misfit strains, also called stress free transformation strains or dilatational strains, is an important parameter in theoretical modeling of hydride embrittlement phenomena [7] such as stress-reorientation [8], delayed hydride cracking (DHC) [9] and hydride blister formation [10]. Using room temperature lattice parameter of hexagonal close packed (hcp) ␣-Zr [11] and face centered cubic (fcc) ␦-ZrH 1.66 [12], Carpenter [13] calculated the dilatational misfit strains of zirconium hydride precipitated in zirconium. However, the lattice parameter of both ␣-Zr [14] and ␦-ZrH x [15] is reported to be influenced by temperature and composition [15,16], and hence is likely to influence the stress free transformation strains.…”

Section: Introductionmentioning

confidence: 99%