Chemical and microstructural characterization of a 9 cycle Zircaloy-2 cladding using EPMA and FIB tomography

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Chemical and microstructural characterization of a 9 cycle Zircaloy-2 cladding using EPMA and FIB tomography. / Baris, Adrienn; Restani, R.; Grabherr, R.; Chiu, Yu-Lung; Evans, Hugh; Ammon, K.; Limback, M; Abolhassani, Sousan.

In: Journal of Nuclear Materials, Vol. 504, 06.2018, p. 144-160.

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Baris, Adrienn ; Restani, R. ; Grabherr, R. ; Chiu, Yu-Lung ; Evans, Hugh ; Ammon, K. ; Limback, M ; Abolhassani, Sousan. / Chemical and microstructural characterization of a 9 cycle Zircaloy-2 cladding using EPMA and FIB tomography. In: Journal of Nuclear Materials. 2018 ; Vol. 504. pp. 144-160.

Bibtex

@article{dc974314f38840439ae971f1dc17a8ec,
title = "Chemical and microstructural characterization of a 9 cycle Zircaloy-2 cladding using EPMA and FIB tomography",
abstract = "A high burn-up Zircaloy-2 cladding is characterised in order to correlate its microstructure and composition to the change of oxidation and hydrogen uptake behaviour during long term service in the reactor. After 9 cycle of service, the chemical analysis of the cladding segment shows that most secondary phase particles (SPPs) have dissolved into the matrix. Fe and Ni are distributed homogenously in the metal matrix. Cr-containing clusters, remnants of the original Zr(Fe, Cr)2 type precipitates, are still present. Hydrides are observed abundantly in the metal side close to the metal-oxide interface. These hydrides have lower Fe and Ni concentration than that in the metal matrix.The three-dimensional (3D) reconstruction of the oxide and the metal-oxide interface obtained by Focused Ion Beam (FIB) tomography shows how the oxide microstructure has evolved with the number of cycles. The composition and microstructural changes in the oxide and the metal can be correlated to the oxidation kinetics and the H-uptake. It is observed that there is an increase in the oxidation kinetics and in the H-uptake between the third and the fifth cycles, as well as during the last two cycles. At the same time the volume fraction of cracks in the oxide significantly increased. Many fine cracks and pores exist in the oxide formed in the last cycle. Furthermore, the EPMA results confirm that this oxide formed at the last cycle reflects the composition of the metal at the metal-oxide interface after the long residence time in the reactor.",
keywords = "Zircaloy-2, Hydrogen uptake, Corrosion, Hydride oxidation, Crack formation, Chemical changes, FIB tomography, Electron probe microanalysis, High burnup",
author = "Adrienn Baris and R. Restani and R. Grabherr and Yu-Lung Chiu and Hugh Evans and K. Ammon and M Limback and Sousan Abolhassani",
year = "2018",
month = jun,
doi = "10.1016/j.jnucmat.2018.01.065",
language = "English",
volume = "504",
pages = "144--160",
journal = "Journal of Nuclear Materials",
issn = "0022-3115",
publisher = "Elsevier",

}

RIS

TY - JOUR

T1 - Chemical and microstructural characterization of a 9 cycle Zircaloy-2 cladding using EPMA and FIB tomography

AU - Baris, Adrienn

AU - Restani, R.

AU - Grabherr, R.

AU - Chiu, Yu-Lung

AU - Evans, Hugh

AU - Ammon, K.

AU - Limback, M

AU - Abolhassani, Sousan

PY - 2018/6

Y1 - 2018/6

N2 - A high burn-up Zircaloy-2 cladding is characterised in order to correlate its microstructure and composition to the change of oxidation and hydrogen uptake behaviour during long term service in the reactor. After 9 cycle of service, the chemical analysis of the cladding segment shows that most secondary phase particles (SPPs) have dissolved into the matrix. Fe and Ni are distributed homogenously in the metal matrix. Cr-containing clusters, remnants of the original Zr(Fe, Cr)2 type precipitates, are still present. Hydrides are observed abundantly in the metal side close to the metal-oxide interface. These hydrides have lower Fe and Ni concentration than that in the metal matrix.The three-dimensional (3D) reconstruction of the oxide and the metal-oxide interface obtained by Focused Ion Beam (FIB) tomography shows how the oxide microstructure has evolved with the number of cycles. The composition and microstructural changes in the oxide and the metal can be correlated to the oxidation kinetics and the H-uptake. It is observed that there is an increase in the oxidation kinetics and in the H-uptake between the third and the fifth cycles, as well as during the last two cycles. At the same time the volume fraction of cracks in the oxide significantly increased. Many fine cracks and pores exist in the oxide formed in the last cycle. Furthermore, the EPMA results confirm that this oxide formed at the last cycle reflects the composition of the metal at the metal-oxide interface after the long residence time in the reactor.

AB - A high burn-up Zircaloy-2 cladding is characterised in order to correlate its microstructure and composition to the change of oxidation and hydrogen uptake behaviour during long term service in the reactor. After 9 cycle of service, the chemical analysis of the cladding segment shows that most secondary phase particles (SPPs) have dissolved into the matrix. Fe and Ni are distributed homogenously in the metal matrix. Cr-containing clusters, remnants of the original Zr(Fe, Cr)2 type precipitates, are still present. Hydrides are observed abundantly in the metal side close to the metal-oxide interface. These hydrides have lower Fe and Ni concentration than that in the metal matrix.The three-dimensional (3D) reconstruction of the oxide and the metal-oxide interface obtained by Focused Ion Beam (FIB) tomography shows how the oxide microstructure has evolved with the number of cycles. The composition and microstructural changes in the oxide and the metal can be correlated to the oxidation kinetics and the H-uptake. It is observed that there is an increase in the oxidation kinetics and in the H-uptake between the third and the fifth cycles, as well as during the last two cycles. At the same time the volume fraction of cracks in the oxide significantly increased. Many fine cracks and pores exist in the oxide formed in the last cycle. Furthermore, the EPMA results confirm that this oxide formed at the last cycle reflects the composition of the metal at the metal-oxide interface after the long residence time in the reactor.

KW - Zircaloy-2

KW - Hydrogen uptake

KW - Corrosion

KW - Hydride oxidation

KW - Crack formation

KW - Chemical changes

KW - FIB tomography

KW - Electron probe microanalysis

KW - High burnup

U2 - 10.1016/j.jnucmat.2018.01.065

DO - 10.1016/j.jnucmat.2018.01.065

M3 - Article

VL - 504

SP - 144

EP - 160

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

SN - 0022-3115

ER -