Microstructure of Oxide Layers Formed During Autoclave Testing of Zirconium Alloys

2009 ◽  
pp. 579-579-20 ◽  
Author(s):  
B Wadman ◽  
Z Lai ◽  
H-O Andrén ◽  
A-L Nyström ◽  
P Rudling ◽  
...  
Keyword(s):  
Zirconium Alloys ◽  
Oxide Layers

scholarly journals Oxidation of Zirconium Alloys. Crystallographic Texture of Zirconia: Interpretation and Mechanical Consequences

1998 ◽  
Vol 30 (3-4) ◽  
pp. 247-263 ◽  
Author(s):  
M. Parise ◽  
I. Touet ◽  
O. Sicardy
Keyword(s):  
Zirconium Alloys ◽  
Crystallographic Direction ◽  
Pressurized Water Reactors ◽  
Monoclinic Zirconia ◽  
Oxide Interface ◽  
Pressurized Water ◽  
Oxide Layers ◽  
Pole Figures ◽  
Water Reactors ◽  
Anisotropic Elastic

In order to have a better knowledge of the mechanical behaviour of the oxide layers growing on zirconium alloys in pressurized water reactors, the textures of different zirconium alloys and their oxide layers are studied. The results show that the texture of the oxide layers present a feature common to all the layers: the tilt angle of the maximum intensities of the pole figures obtained on the layers is almost quite identical for all the studied substrates. The azimuthal reinforcements depend on the metallurgical state of the substrate.The crystallographic direction of monoclinic zirconia common to all the oxide grains is identified. A computation based on mechanical issues is presented: considering the anisotropic elastic properties of the monoclinic monocrystal, it is shown that the particular crystallographic direction is linked to an isotropic state of strains in the plane of the metal–oxide interface.

scholarly journals Microbeam synchrotron radiation diffraction and fluorescence of oxide layers formed on zirconium alloys at different corrosion temperatures

2019 ◽  
Vol 526 ◽  
pp. 151779
Author(s):  
Brendan Ensor ◽  
David J. Spengler ◽  
John R. Seidensticker ◽  
Ram Bajaj ◽  
Zhonghou Cai ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Zirconium Alloys ◽  
Oxide Layers ◽  
Synchrotron Radiation Diffraction

Raman study of oxide layers on zirconium alloys using 18O tracers

2020 ◽  
Vol 55 (6) ◽  
pp. 460-470
Author(s):  
Pavel Sialini ◽  
Petr Sajdl ◽  
Krystof Dobrovolny
Keyword(s):  
Zirconium Alloys ◽  
Oxide Layers ◽  
Raman Study

Growth and characterization of oxide layers on zirconium alloys

1996 ◽  
Vol 229 ◽  
pp. 79-92 ◽  
Author(s):  
A.J.G. Maroto ◽  
R. Bordoni ◽  
M. Villegas ◽  
A.M. Olmedo ◽  
M.A. Blesa ◽  
...  
Keyword(s):  
Zirconium Alloys ◽  
Oxide Layers

scholarly journals Influence of Oxidation Media on the Transport Properties of Thin Oxide Layers of Zirconium Alloys

10.14311/1002 ◽  
2007 ◽  
Vol 47 (6) ◽  
Author(s):  
H. Frank
Keyword(s):  
Activation Energy ◽  
Zirconium Alloys ◽  
Bottom Layer ◽  
Oxide Layers ◽  
Air Samples ◽  
Ag Electrodes ◽  
Order Of Magnitude ◽  
Injection Currents ◽  
Space Charge Limited Currents ◽  
Equal Thickness

Two batches of tubes of Zr1Nb and of Zry-4W were oxidized for 30 days at 425 °C in steam, and for 360 days at 500 °C in air, respectively. The analysis of the I-V characteristics at constant temperatures up to 220 °C of oxide layers of nearly equal thickness gave an activation energy of 1,3 eV for the grey homogeneous steam samples, and of 0.4 eV for the white surface layer, and of 1.3 eV at temperatures over 140 °C, for the grey bottom layer of the air samples, respectively. The I-V characteristics were sub-linear in the air samples, the current growing less at rising voltages, but staightening to super-linear space-charge limited currents at higher temperatures. The injection currents flowing when voltage was applied did not reach constant equilibrium, but at a bend, continued with a lesser slope. The resistivity was about one order of magnitude greater in air samples and greater in Zry-4W. The relative permittivity was greater in the steam samples and greater in Zr1Nb. The currents of the air samples were greater with Au electrodes than with Ag electrodes. 

Control of hydrogen absorption by nickel films obtained upon magnetic spraying of zirconium alloy using the thermoEMF method

2020 ◽  
Vol 86 (8) ◽  
pp. 32-37
Author(s):  
V. V. Larionov ◽  
Xu Shupeng ◽  
V. N. Kudiyarov
Keyword(s):  
Magnetron Sputtering ◽  
Hydrogen Concentration ◽  
Hydrogen Absorption ◽  
Zirconium Alloy ◽  
Hydrogen Adsorption ◽  
Zirconium Alloys ◽  
Nickel Film ◽  
Protective Film ◽  
Nickel Films ◽  
Hydrogen Penetration

Nickel films formed on the surface of zirconium alloys are often used to protect materials against hydrogen penetration. Hydrogen adsorption on nickel is faster since the latter actively interacts with hydrogen, oxidizes and forms a protective film. The goal of the study is to develop a method providing control of hydrogen absorption by nickel films during vacuum-magnetron sputtering and hydrogenation via measuring thermoEMF. Zirconium alloy E110 was saturated from the gas phase with hydrogen at a temperature of 350°C and a pressure of 2 atm. A specialized Rainbow Spectrum unit was used for coating. It is shown that a nickel film present on the surface significantly affects the hydrogen penetration into the alloy. A coating with a thickness of more than 2 μm deposited by magnetron sputtering on the surface of a zirconium alloy with 1% Nb, almost completely protects the alloy against hydrogen penetration. The magnitude of thermoemf depends on the hydrogen concentration in the zirconium alloy and film thickness. An analysis of the hysteresis width of the thermoEMF temperature loop and a method for determining the effective activation energy of the conductivity of a hydrogenated material coated with a nickel film are presented. The results of the study can be used in assessing the hydrogen concentration and, hence, corrosion protection of the material.

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