Effect of irradiation on the precipitate stability in Zr alloys

Pêcheur, D; Lefebvre, F.; Motta, Arthur T.; Lemaignan, C.; Charquet, D.

doi:10.1016/0022-3115(93)90108-b

Cited by 60 publications

(26 citation statements)

References 10 publications

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“…Other studies have shown the rate of amorphous ingress to be similar for Zircaloy-2 Fe-Cr SPPs at ~10 per 1 x10 25 n m -2 under BWR conditions [49]. In this regard, proton irradiation has greater similarity to neutron irradiation in comparison to electron or heavy ion irradiation, for which T crit is equal to ~30 °C [50] and ~380-580 °C [50,51], respectfully, depending of course on particle flux and type of heavy ion. The reason for such discrepancies may be deduced from a consideration of the various damage rates and the nature of the damage created.…”

Section: Spp Dissolution and Amorphisationmentioning

confidence: 89%

“…As the Fe/Ni largely decreases towards the SPP edge with increasing dose, we believe that the solute is being dispersed into the matrix. While Zu et al did not demonstrate chemical evolution within SPPs in Zircaloy-4, this could be due to either a better stability because of the higher Fe/Cr ratio in Zircaloy-2 Fe-Cr SPPs [5,6,41,50,58] or due to the limitations associated with single-point EDS sampling or line scans. However, the authors presented energy-filtered TEM, which suggested the possibility of post-irradiation Fe segregation to the matrix-SPP interfacial region for an Fe-Cr SPP and to that of a small SPP the authors referred to as ZrFe 2 [47].…”

Section: Spp Dissolution and Amorphisationmentioning

confidence: 93%

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Nano-scale chemical evolution in a proton-and neutron-irradiated Zr alloy

Harte

Topping

Frankel

et al. 2017

Journal of Nuclear Materials

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A. Harte et al., Nano-scale chemical evolution in a proton-and neutron-irradiated Zr alloy J. Nucl. Mater. Accepted Jan. 2017 Nano-scale chemical evolution in a proton-and neutron-irradiated Zr alloy (Fe,Ni). This is accomplished through ultra-high spatial resolution scanning transmission electron microscopy and the use of energy-dispersive X-ray spectroscopic methods. Fe-depletion is observed from both SPP types after irradiation with both irradiative species, but is heterogeneous in the case of Zr(Fe,Cr) 2 , predominantly from the edge region, and homogeneously in the case of Zr 2 (Fe,Ni). Further, there is evidence of a delay in the dissolution of the Zr 2 (Fe,Ni) SPP with respect to the Zr(Fe,Cr) 2 . As such, SPP dissolution results in matrix supersaturation with solute under both irradiative species and proton irradiation is considered well suited to emulate the effects of neutron irradiation in this context. The mechanisms of solute redistribution processes from SPPs and the consequences for irradiation-induced growth phenomena are discussed.

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Section: Spp Dissolution and Amorphisationmentioning

confidence: 89%

Section: Spp Dissolution and Amorphisationmentioning

confidence: 93%

Nano-scale chemical evolution in a proton-and neutron-irradiated Zr alloy

Harte

Topping

Frankel

et al. 2017

Journal of Nuclear Materials

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“…It has been demonstrated by many previous works [1,2,4,[26][27][28] that the crystalline to amorphous transformation for a particular intermetallic precipitate is dependent on temperature, flux, and fluence. In the current investigation, the bombardment flux and total dose are fixed to 1 × 10 −3 dpa/s and 10 dpa, respectively, which means that, within our study, only changes in the contribution from thermal annealing are being investigated as influencing the amorphous transformation.…”

Section: Amorphization Of Precipitatesmentioning

confidence: 99%

Precipitate Stability in a Zr–2.5Nb–0.5Cu Alloy under Heavy Ion Irradiation

Dong

Yao

Wang

et al. 2017

Metals

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Abstract:The stability of precipitates in Zr-2.5Nb-0.5Cu alloy under heavy ion irradiation from 100 • C to 500 • C was investigated by quantitative Chemi-STEM EDS analysis. Irradiation results in the crystalline to amorphous transformation of Zr 2 Cu between 200 • C and 300 • C, but the β-Nb remains crystalline at all temperatures. The precipitates are found to be more stable in starting structures with multiple boundaries than in coarse grain structures. There is an apparent increase of the precipitate size and a redistribution of the alloying element in certain starting microstructures, while a similar size change or alloying element redistribution is not detected or only detected at a much higher temperature in other starting microstructures after irradiation.

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“…It remains unclear how much overlap there is between the various kinetic processes that occur during SPP exposure to irradiation. However, the size of irradiated SPPs reported in the literature suggest that for the dominant cubic Zr(Cr,Fe) 2 SPPs in Zircaloy-4 in the intermediate temperature range (T = 520−580 K) composition change and amorphization usually occurs prior to a large size change due to dissolution [3,[7][8][9]. Temperature plays a key role in determining the observed behaviour since the rates of both amorphization and dissolution are expected to be temperature dependent, but with different sensitivities.…”

Section: Introductionmentioning

confidence: 99%

“…Fe) after irradiation exposure, and the thickness of the denuded layer grows linearly with time (for a constant dose rate). This can also be accompanied by amorphization of the crystalline SPP phase in some cases [3,4,[6][7][8] The exact mechanism by which irradiation alters the composition and structure of SPPs remains under debate and a number of models have been developed to predict this process based on different proposed physical processes [3,6,8,9].…”

Section: Introductionmentioning

confidence: 99%

Modeling precipitate evolution in zirconium alloys during irradiation

Robson

2016

Journal of Nuclear Materials

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The second phase precipitates (SPPs) in zirconium alloys are critical in controlling their performance. During service, SPPs are subject to both thermal and irradiation effects that influence volume fraction, number, and size. In this paper, a model has been developed to capture the combined effect of thermal and irradiation exposure on the Zr(Fe,Cr) 2 precipitates in Zircaloy. The model includes irradiation induced precipitate destabilisation integrated into a classical size class model for nucleation, growth and coarsening. The model has been applied to predict the effect of temperature and irradiation on SPP evolution. Increasing irradiation displacement rate is predicted to strongly enhance the loss of particles that arises from coarsening alone. The effect of temperature is complex due to competition between coarsening and irradiation damage. As temperature increases, coarsening is predicted to become increasingly important compared to irradiation induced dissolution and may increase resistance to irradiation induced dissolution by increasing particle size.

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Effect of irradiation on the precipitate stability in Zr alloys

Cited by 60 publications

References 10 publications

Nano-scale chemical evolution in a proton-and neutron-irradiated Zr alloy

Nano-scale chemical evolution in a proton-and neutron-irradiated Zr alloy

Precipitate Stability in a Zr–2.5Nb–0.5Cu Alloy under Heavy Ion Irradiation

Modeling precipitate evolution in zirconium alloys during irradiation

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