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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Cross-sectional bright-field TEM micrograph of the implanted steel with magnified dark-field (a) and bright-field (b) insets representing the range of 3000–10,000 He-appm.