The α → ω phase transformation in zirconium followed with ms-scale time-resolved X-ray absorption spectroscopy

Dewaele, Agnès; André, Rémi F.; Occelli, F.; Mathon, O.; Pascarelli, S.; Irifune, Tetsuo; Loubeyre, P.

doi:10.1080/08957959.2016.1199692

Cited by 13 publications

(6 citation statements)

References 31 publications

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“…This trend reproduces the observation that the application of hydrostatic compression favours the w phase and results in dissolution of d hydride. However, the results showed that w only formed at 17-19 GPa, when in pure Zr it is known to form somewhere between 2-11.6 GPa [18][19], at 300 K, which implies that interstitial hydrogen retards the formation of w. This is reasonable given that hydrogen expands the a-Zr lattice and is also a known b bcc phase (i.e. least dense phase) stabiliser, as shown by the Zr-H phase diagram [30].…”

Section: Discussionmentioning

confidence: 98%

“…Investigation into the effect of interstitial hydrogen in Zircaloy on the stability of the α phase relative to the high pressure ω phase (hexagonal) was also carried out. Pure zirconium transforms from α phase to ω phase at ambient temperature at around 3.5 GPa pressure [18] although a range of transition pressure have been observed, sensitive to impurities [19].…”

Section: Introductionmentioning

confidence: 99%

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The effect of pressure on hydrogen solubility in Zircaloy-4

Weekes

Dye

Proctor

et al. 2019

Journal of Nuclear Materials

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The effect of pressure on the room temperature solubility of hydrogen in Zircaloy-4 was examined using synchrotron X-ray diffraction on small ground flake samples in a diamond anvil cell at pressures up to 20.9 GPa. Different combinations of hydrogen level/state in the sample and of pressure transmitting medium were examined; in all three experiments, it could be concluded that pressure resulted in the dissolution of d hydrides and that interstitial hydrogen seemingly retards the formation of w Zr. A pressure of around 9 GPa was required to halve the hydride fraction. These results imply that the effect of pressure is thermodynamically analogous to that of increasing temperature, but that the effect is small. The results are consistent with the volume per Zr atom of the a, d and w phases, with the bulk moduli of a and d, and with previous measurements of the hydrogen site molar volumes in the a and d phases. The results are interpreted in terms of their implication for our understanding of the driving forces for hydride precipitation at crack tips, which are in a region of hydrostatic tensile stress on the order of 1.5 GPa.

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Section: Discussionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

The effect of pressure on hydrogen solubility in Zircaloy-4

Weekes

Dye

Proctor

et al. 2019

Journal of Nuclear Materials

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“…3. Recent static compression data from Dewaele et al 5 gives dB T /dP = 2.92 based on fitting their room temperature P −V data. Because this change is supported by independent data sets and theoretical calculations, we view it as well-founded.…”

Section: Equation Of Statementioning

confidence: 99%

“…Metallic Zr and its alloys have practical applications in chemical processing and nuclear power. 1 The high pressure properties and phase diagram of pure Zr have been studied extensively [2][3][4][5][6][7][8][9][10][11][12][13][14][15] using both static and dynamic compression techniques. The high pressure phase diagram is shown in figure 2.…”

Section: Introductionmentioning

confidence: 99%

A Model for Phase Transitions Under Dynamic Compression

Greeff

2016

J. dynamic behavior mater.

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An approach is described for simulating phase transitions among an arbitrary number of phases under dynamic compression. The time evolution of the phase fractions k i is governed by the master equation, which naturally incorporates the constraints P i k i ¼ 1 and 0 k i 1. The rates are taken to be strongly nonlinear functions of the thermodynamic driving forces. The implementation of the method is described, and illustrative applications to phase transitions in Zr are shown. The relation of the model to irreversible thermodynamics is discussed. A modification for the case where domain growth limits the transformation rate is described. This variant gives sigmoidal transformation-time curves, with the second phase fraction proportional to t 3 at early time.

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“…Our current work is motivated by the fact that, in some of the high-pressure investigations of structural phase transitions, there has been experimental evidence suggesting that Zr, as well as some other materials, exhibit an unusual grain enlargement induced by pressure during the structural phase transformation without increase of temperature 12–15 . However, the evidence of grain enlargement in the resulting high-pressure product phase so far has been suggested essentially based on the relative change to a “spotty” x-ray diffraction pattern from the “smooth” diffraction pattern collected from the starting parent phase heaving finer grain size 12–15 . Although the relative change in appearance of diffraction pattern supports the grain size increase qualitatively, it may not be conclusive by itself.…”

Section: Introductionmentioning

confidence: 99%

Real time study of grain enlargement in zirconium under room-temperature compression across the α to ω phase transition

Popov

Velisavljevic

Liu

et al. 2019

Sci Rep

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We report a synchrotron Laue diffraction study on the microstructure evolution in zirconium (Zr) as it undergoes a pressure-driven structural phase transformation, using a recently developed real time scanning x-ray microscopy technique. Time resolved characterizations of microstructure under high pressure show that Zr exhibits a grain enlargement across the α-Zr to ω-Zr structural phase transition at room-temperature, with nucleation and growth of ω-Zr crystals observed from initially a nano-crystalline aggregate of α-Zr. The observed grain enlargement is unusual since the enlargement processes typically require substantially high temperature to overcome the activation barriers for forming and moving of grain boundaries. Possible mechanisms for the grain enlargement are discussed.

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The α → ω phase transformation in zirconium followed with ms-scale time-resolved X-ray absorption spectroscopy

Cited by 13 publications

References 31 publications

The effect of pressure on hydrogen solubility in Zircaloy-4

The effect of pressure on hydrogen solubility in Zircaloy-4

A Model for Phase Transitions Under Dynamic Compression

Real time study of grain enlargement in zirconium under room-temperature compression across the α to ω phase transition

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