Prior implantation of hydrogen as a mechanism to delay helium bubbles, blistering, and exfoliation in titanium
Prior implantation of hydrogen as a mechanism to delay helium bubbles, blistering, and exfoliation in titanium
Fink Ilyasafov, S.; Maman, N.; Kentsch, U.; Zenou, V. Y.; Vaknin, M.; Rakita, Y.; Zamir, G.; Dahan, I.; Shneck, R. Z.
Abstract
This study explores the delaying of the formation of helium bubbles and blisters in pure titanium by hydrogen pre-implantation. Titanium, implanted with helium (40 KeV, 5 × 10¹⁷ ions/cm²), exhibited large bubbles that cause exfoliation after heat treatment, whereas hydrogen pre-implantation inhibited bubble growth at room temperature and reduced the exfoliation after heat treatment.
In the samples pre-implanted with hydrogen, we found evidence of helium diffusion delay by: (a) a fourfold reduction in bubble pressure (b) faceted cavities in the samples (c) a smaller increase in titanium lattice pa- rameters (d) a 16-fold reduction in average bubble size and a sixfold reduction in bubble area fraction (e) a more than twofold decrease in exfoliation (f) a tendency toward the formation of larger bubbles as a result of heat treatment. We believe that it is reasonable to assume that the inhibition of helium diffusion between tetrahedral interstitial lattice sites takes place because of the occupation of the intermediate octahedral sites by hydrogen atoms.
Evidence for the opposite effect, that is inhibition of the diffusion of hydrogen in the presence of helium, is found in the retention of hydrogen in the specimens at elevated temperatures. This retention allowed the exis- tence of titanium hydride after heat treatment at 680 °C. The present study sheds light on the intricate interplay between hydrogen and helium in titanium, providing insights into mechanisms that can potentially mitigate helium-induced damage in materials.
Keywords: Bubble formation; Helium implantation; Pre-implantation; Plasma-facing materials (PFMs); Nuclear technology; Irradiation damage; Helium diffusion; Titanium hydride; Blisters; Surface exfoliation; Repulsive interactions; EELS
Involved research facilities
- Ion Beam Center DOI: 10.17815/jlsrf-3-159
Related publications
- DOI: 10.17815/jlsrf-3-159 is cited by this (Id 39044) publication
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Journal of Nuclear Materials 594(2024), 155017
DOI: 10.1016/j.jnucmat.2024.155017
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- Secondary publication expected from 13.03.2025
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