Direct Observation of Sink-Dependent Defect Evolution in Nanocrystalline Iron under Irradiation

Abstract Crystal defects generated during irradiation can result in severe changes in morphology and an overall degradation of mechanical properties in a given material. Nanomaterials have been proposed as radiation damage tolerant materials, due to the hypothesis that defect density decreases with...

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Autores principales:	O. El-Atwani, J. E. Nathaniel, A. C. Leff, K. Hattar, M. L. Taheri
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/5981a57316d94bbeb012ead66f05cc91
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spelling	oai:doaj.org-article:5981a57316d94bbeb012ead66f05cc912021-12-02T16:06:21ZDirect Observation of Sink-Dependent Defect Evolution in Nanocrystalline Iron under Irradiation10.1038/s41598-017-01744-x2045-2322https://doaj.org/article/5981a57316d94bbeb012ead66f05cc912017-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-01744-xhttps://doaj.org/toc/2045-2322Abstract Crystal defects generated during irradiation can result in severe changes in morphology and an overall degradation of mechanical properties in a given material. Nanomaterials have been proposed as radiation damage tolerant materials, due to the hypothesis that defect density decreases with grain size refinement due to the increase in grain boundary surface area. The lower defect density should arise from grain boundary-point defect absorption and enhancement of interstitial-vacancy annihilation. In this study, low energy helium ion irradiation on free-standing iron thin films were performed at 573 K. Interstitial loops of a 0 /2 [111] Burgers vector were directly observed as a result of the displacement damage. Loop density trends with grain size demonstrated an increase in the nanocrystalline (<100 nm) regime, but scattered behavior in the transition from the nanocrystalline to the ultra-fine regime (100–500 nm). To examine the validity of such trends, loop density and area for different grains at various irradiation doses were compared and revealed efficient defect absorption in the nanocrystalline grain size regime, but loop coalescence in the ultra-fine grain size regime. A relationship between the denuded zone formation, a measure of grain boundary absorption efficiency, grain size, grain boundary type and misorientation angle is determined.O. El-AtwaniJ. E. NathanielA. C. LeffK. HattarM. L. TaheriNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-12 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q O. El-Atwani J. E. Nathaniel A. C. Leff K. Hattar M. L. Taheri Direct Observation of Sink-Dependent Defect Evolution in Nanocrystalline Iron under Irradiation
description	Abstract Crystal defects generated during irradiation can result in severe changes in morphology and an overall degradation of mechanical properties in a given material. Nanomaterials have been proposed as radiation damage tolerant materials, due to the hypothesis that defect density decreases with grain size refinement due to the increase in grain boundary surface area. The lower defect density should arise from grain boundary-point defect absorption and enhancement of interstitial-vacancy annihilation. In this study, low energy helium ion irradiation on free-standing iron thin films were performed at 573 K. Interstitial loops of a 0 /2 [111] Burgers vector were directly observed as a result of the displacement damage. Loop density trends with grain size demonstrated an increase in the nanocrystalline (<100 nm) regime, but scattered behavior in the transition from the nanocrystalline to the ultra-fine regime (100–500 nm). To examine the validity of such trends, loop density and area for different grains at various irradiation doses were compared and revealed efficient defect absorption in the nanocrystalline grain size regime, but loop coalescence in the ultra-fine grain size regime. A relationship between the denuded zone formation, a measure of grain boundary absorption efficiency, grain size, grain boundary type and misorientation angle is determined.
format	article
author	O. El-Atwani J. E. Nathaniel A. C. Leff K. Hattar M. L. Taheri
author_facet	O. El-Atwani J. E. Nathaniel A. C. Leff K. Hattar M. L. Taheri
author_sort	O. El-Atwani
title	Direct Observation of Sink-Dependent Defect Evolution in Nanocrystalline Iron under Irradiation
title_short	Direct Observation of Sink-Dependent Defect Evolution in Nanocrystalline Iron under Irradiation
title_full	Direct Observation of Sink-Dependent Defect Evolution in Nanocrystalline Iron under Irradiation
title_fullStr	Direct Observation of Sink-Dependent Defect Evolution in Nanocrystalline Iron under Irradiation
title_full_unstemmed	Direct Observation of Sink-Dependent Defect Evolution in Nanocrystalline Iron under Irradiation
title_sort	direct observation of sink-dependent defect evolution in nanocrystalline iron under irradiation
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/5981a57316d94bbeb012ead66f05cc91
work_keys_str_mv	AT oelatwani directobservationofsinkdependentdefectevolutioninnanocrystallineironunderirradiation AT jenathaniel directobservationofsinkdependentdefectevolutioninnanocrystallineironunderirradiation AT acleff directobservationofsinkdependentdefectevolutioninnanocrystallineironunderirradiation AT khattar directobservationofsinkdependentdefectevolutioninnanocrystallineironunderirradiation AT mltaheri directobservationofsinkdependentdefectevolutioninnanocrystallineironunderirradiation
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Direct Observation of Sink-Dependent Defect Evolution in Nanocrystalline Iron under Irradiation

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