Mechanical behavior of a chromium coating on a zirconium alloy substrate at room temperature

The mechanical behavior of a 15 µm-thick chromium coating deposited on a zirconium alloy substrate using a particular physical vapor deposition process is studied at room temperature using several experimental techniques at different scales: biaxial tests (internal pressure + axial tension) with sev...

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Bibliographic Details
Published in:Journal of nuclear materials 2022-01, Vol.558, p.153332, Article 153332
Main Authors: Nguyen, Duc Vinh, Le Saux, Matthieu, Gélébart, Lionel, Brachet, Jean-Christophe, Bonthonneau, Jean-Philippe, Courcelle, Arnaud, Guillou, Raphaelle, Rouesne, Elodie, Urvoy, Stephane
Format: Article
Language:English
Subjects:
Acoustic emission
Axial stress
Biaxial tests
Chromium
Chromium coating
Coating
Coatings
Cracking
Cracks
Digital image correlation
Digital imaging
Emission analysis
Engineering Sciences
Enhanced accident tolerant fuel claddings
Internal pressure
Mechanical properties
Mechanics
Mechanics of materials
Physical vapor deposition
Plastic deformation
Plasticity
Room temperature
Scanning electron microscopy
Strain
Substrates
Tensile tests
Tubes
Zirconium
Zirconium alloys
Zirconium base alloys
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Summary:The mechanical behavior of a 15 µm-thick chromium coating deposited on a zirconium alloy substrate using a particular physical vapor deposition process is studied at room temperature using several experimental techniques at different scales: biaxial tests (internal pressure + axial tension) with several stress biaxiality ratios on outer-coated tubes; in situ tensile tests in a scanning electron microscope (SEM) on coated sheet samples. The cracking and plasticity of the coating are studied using acoustic emission, digital image correlation and SEM observations. The results show that the first channeling cracks in the coating initiate at 0.3-0.4% macroscopic strain, when the substrate starts to yield. Under further loading, the crack density increases first rapidly then more slowly, before reaching saturation. Plastic strain of the non-cracked coating regions is observed, in addition to the increase of crack opening. No interface decohesion of the coating is observed. The cracks, both transgranular and intergranular, do not penetrate significantly into the substrate.
ISSN:0022-3115
1873-4820
DOI:10.1016/j.jnucmat.2021.153332