The Microstructure of Zr/Nb Nanoscale Multilayer Coatings Irradiated with Helium Ions

The effect of helium ion irradiation on the microstructure and properties of composites based on Zr/Nb nanoscale multilayer coatings (NMCs) was studied. X-ray diffraction (XRD), transmission electron microscopy (TEM), and variable-energy Doppler broadening spectroscopy (DBS) were used for the in-dep...

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Published in:Coatings (Basel) 2023-01, Vol.13 (1), p.193
Main Authors: Laptev, Roman, Stepanova, Ekaterina, Pushilina, Natalia, Kashkarov, Egor, Krotkevich, Dmitriy, Lomygin, Anton, Sidorin, Alexey, Orlov, Oleg, Uglov, Vladimir
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Language:English
Subjects:
Blistering
Blisters
Coatings
Defects
Electron density
Energy
Helium ions
Ion irradiation
Mechanical properties
Microstructure
Multilayers
Niobium
Positrons
Radiation
Residual stress
Spectrum analysis
Thickness
Zirconium
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container_title Coatings (Basel)
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creator Laptev, Roman
Stepanova, Ekaterina
Pushilina, Natalia
Kashkarov, Egor
Krotkevich, Dmitriy
Lomygin, Anton
Sidorin, Alexey
Orlov, Oleg
Uglov, Vladimir
description The effect of helium ion irradiation on the microstructure and properties of composites based on Zr/Nb nanoscale multilayer coatings (NMCs) was studied. X-ray diffraction (XRD), transmission electron microscopy (TEM), and variable-energy Doppler broadening spectroscopy (DBS) were used for the in-depth analysis of defects in the irradiated NMCs. After irradiation of the Zr/Nb NMCs with helium ions at a 1017 ion/cm2 dose, the layered structure was generally retained, but the internal stresses in the layers were increased, which caused wave-like distortion in the ion deposition zone. The Zr/Nb NMCs with an individual layer thickness of 25 nm were characterized by the smallest microstress changes, but single blisters were formed in the near-surface region. The microstructure of the Zr/Nb NMCs with a layer thickness of 100 nm exhibited relatively smaller changes upon helium ion irradiation. The prevailing positron-trapping center was the reduced-electron-density area at the interfaces before and after irradiation of the Zr/Nb NMCs regardless of the layer thickness. However, the layer thickness affected the DBS parameter profiles depending on the positron energy, which was probably due to the different localization of implanted ions within the layers or at the interfaces.
doi_str_mv 10.3390/coatings13010193
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subjects Blistering
Blisters
Coatings
Defects
Electron density
Energy
Helium ions
Ion irradiation
Mechanical properties
Microstructure
Multilayers
Niobium
Positrons
Radiation
Residual stress
Spectrum analysis
Thickness
Zirconium
title The Microstructure of Zr/Nb Nanoscale Multilayer Coatings Irradiated with Helium Ions
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