Some observations on the phase transformations in zirconium hydrides

Barraclough, K.G.; Beevers, C.J.

doi:10.1016/0022-3115(70)90112-1

Cited by 89 publications

(46 citation statements)

References 10 publications

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“…Zr hydride can form in one of three crystal structures, depending on hydrogen concentration and cooling rate from solution temperature [9][10][11][12][13][14][15]. At figure 3 are examples of EEL spectra for v-and 6-hydrides in Zr-2.5Nb respectively.…”

mentioning

confidence: 99%

EELS characterization of zirconium hydrides

Woo

Carpenter

1992

Microsc. Microanal. Microstruct.

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Abstract. 2014 The energy of the first plasmon loss peak has been determined for the ~-Zr hydride phase in pure Zr. The peak energy is sufficiently different from that of the 03B4-hydride to permit EELS "fingerprinting" with ease using a parallel EELS system, but with greater difficulty using serial EELS, because of drift associated with the slower collection rates. Experiments on Zr-2.5Nb alloys showed that the hydride phases can also be distinguished using EELS, facilitating the analysis of hydride precipitates and blisters in nuclear reactor pressure tubes.

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mentioning

confidence: 99%

EELS characterization of zirconium hydrides

Woo

Carpenter

1992

Microsc. Microanal. Microstruct.

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“…Results from the powder pattern of ZrH 1.27 also provided evidence of the presence of both the c-and d-hydride phases plus a small amount of a third phase that was not identified, but likely was the a-Zr phase on the basis of the results by Sidhu et al [24] and microhardness measurements of Barraclough and Beevers [5]. Supporting metallographic studies of specimens in the composition range r = 1.47-1.57 showed that the c-hydride phase appeared as banded precipitates of lenticular shape embedded in the majority d-hydride phase (Figs.…”

Section: Crystallographic Properties Of the C-hydride Phasementioning

confidence: 88%

“…Barraclough and Beevers [5] found that for specimens having overall compositions of ZrH 1.47 , ZrH 1.52 , and ZrH 1.57 , in addition to a strong signal indicating copious amounts of the d-hydride phase, there were also weak signals attributed to the c-hydride phase. Results from the powder pattern of ZrH 1.27 also provided evidence of the presence of both the c-and d-hydride phases plus a small amount of a third phase that was not identified, but likely was the a-Zr phase on the basis of the results by Sidhu et al [24] and microhardness measurements of Barraclough and Beevers [5].…”

Section: Crystallographic Properties Of the C-hydride Phasementioning

confidence: 96%

“…Following this insightful study by Beck [7], a series of bulk hydrogenated specimens in the composition range from ZrH 1.27 to ZrH 1.92 were prepared by Barraclough and Beevers [5] to determine their room temperature metallography, microhardness, and crystal structure properties. It is shown that the findings of these authors support those of Beck.…”

Section: Crystallographic Properties Of the C-hydride Phasementioning

confidence: 99%

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Properties of Bulk Zirconium Hydrides

Püls¹

2012

The Effect of Hydrogen and Hydrides on the Integrity of Zirconium Alloy Components

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“…First, the crystallographic Figure 11: (a) Nanohardness measurements with a 10mN load on two profiles on a 217 µm deep blister on the radial circumferential plane, (b) evolution of the hardness of the hydrided zirconium as a function of the hydrogen content from [31,66,67,68,69,70], (c) elastic modulus measured from the nanohardness measurements considering a ν=0.3 Poisson ratio and (d) evolution of the elastic modulus of the hydrided zirconium as a function of the hydrogen content from [31,65,68,71,72,73,74].…”

Section: Comparison Of Different Laboratory Grown Blistersmentioning

confidence: 99%

Formation and characterization of hydride blisters in Zircaloy-4 cladding tubes

Ménibus

Auzoux

Dieye

et al. 2014

Journal of Nuclear Materials

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This article is focused on the formation of hydride blisters in zirconium alloys an experimental and theoritical standpoint, and their characterization in terms of morphology, hydrides crystallographic phases, hardness and hydrogen concentration. An experimental setup was developed to grow hydride blisters on pre-hydrided Zircaloy-4 cladding tubes by thermo-diffusion. The thermal conditions were optimized based on thermo-diffusion calculations, that take into account the hysteresis in the hydrogen solubility limit, to obtain a high blister growth rate. Micro X-Ray Diffraction (XRD), nano-hardness and Elastic Recoil Detection Analysis (ERDA) showed that the blisters contain a hydrogen gradient, with pure δ-hydride phase close to the external surface over one third of the blister depth. thermo-diffusion * Tel.: +33 1 69 08 39 43; e-mail: arthur.hellouin-de-menibus@cea.fr 1 calculations showed these half thickness blisters should grow in only a few days in PWR conditions. Eventually, the Diffusion Equilibrium Threshold (DET) was defined as a criterion that limits the blister growth, and emphasizes that the hysteresis in the hydrogen solubility limit in zirconium must be taken into account to model hydrogen thermo-diffusion in zirconium alloys.

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Some observations on the phase transformations in zirconium hydrides

Cited by 89 publications

References 10 publications

EELS characterization of zirconium hydrides

EELS characterization of zirconium hydrides

Properties of Bulk Zirconium Hydrides

Formation and characterization of hydride blisters in Zircaloy-4 cladding tubes

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