Effects of precipitates and dislocation loops on the yield stress of irradiated iron

Abstract Plastic deformation of crystalline materials is governed by the features of stress-driven motion of dislocations. In the case of irradiated steels subject to applied stresses, small dislocation loops as well as precipitates are known to interfere with the dislocation motion, leading to an i...

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Autores principales:	Arttu Lehtinen, Lasse Laurson, Fredric Granberg, Kai Nordlund, Mikko J. Alava
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2018
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/ac0ca6f173614d4a9b7044440cba72ec
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spelling	oai:doaj.org-article:ac0ca6f173614d4a9b7044440cba72ec2021-12-02T12:32:48ZEffects of precipitates and dislocation loops on the yield stress of irradiated iron10.1038/s41598-018-25285-z2045-2322https://doaj.org/article/ac0ca6f173614d4a9b7044440cba72ec2018-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-018-25285-zhttps://doaj.org/toc/2045-2322Abstract Plastic deformation of crystalline materials is governed by the features of stress-driven motion of dislocations. In the case of irradiated steels subject to applied stresses, small dislocation loops as well as precipitates are known to interfere with the dislocation motion, leading to an increased yield stress as compared to pure crystals. We study the combined effect of precipitates and interstitial glissile $$\frac{{\bf{1}}}{{\bf{2}}}\langle {\bf{111}}\rangle $$ 12〈111〉 dislocation loops on the yield stress of iron, using large-scale three-dimensional discrete dislocation dynamics simulations. Precipitates are included in the simulations using our recent multi-scale implementation [A. Lehtinen et al., Phys. Rev. E 93 (2016) 013309], where the strengths and pinning mechanisms of the precipitates are determined from molecular dynamics simulations. In the simulations we observe dislocations overcoming precipitates with an atypical Orowan mechanism which results from pencil-glide of screw segments in iron. Even if the interaction mechanisms with dislocations are quite different, our results suggest that in relative terms, precipitates and loops of similar sizes contribute equally to the yield stress in multi-slip conditions.Arttu LehtinenLasse LaursonFredric GranbergKai NordlundMikko J. AlavaNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 8, Iss 1, Pp 1-12 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Arttu Lehtinen Lasse Laurson Fredric Granberg Kai Nordlund Mikko J. Alava Effects of precipitates and dislocation loops on the yield stress of irradiated iron
description	Abstract Plastic deformation of crystalline materials is governed by the features of stress-driven motion of dislocations. In the case of irradiated steels subject to applied stresses, small dislocation loops as well as precipitates are known to interfere with the dislocation motion, leading to an increased yield stress as compared to pure crystals. We study the combined effect of precipitates and interstitial glissile $$\frac{{\bf{1}}}{{\bf{2}}}\langle {\bf{111}}\rangle $$ 12〈111〉 dislocation loops on the yield stress of iron, using large-scale three-dimensional discrete dislocation dynamics simulations. Precipitates are included in the simulations using our recent multi-scale implementation [A. Lehtinen et al., Phys. Rev. E 93 (2016) 013309], where the strengths and pinning mechanisms of the precipitates are determined from molecular dynamics simulations. In the simulations we observe dislocations overcoming precipitates with an atypical Orowan mechanism which results from pencil-glide of screw segments in iron. Even if the interaction mechanisms with dislocations are quite different, our results suggest that in relative terms, precipitates and loops of similar sizes contribute equally to the yield stress in multi-slip conditions.
format	article
author	Arttu Lehtinen Lasse Laurson Fredric Granberg Kai Nordlund Mikko J. Alava
author_facet	Arttu Lehtinen Lasse Laurson Fredric Granberg Kai Nordlund Mikko J. Alava
author_sort	Arttu Lehtinen
title	Effects of precipitates and dislocation loops on the yield stress of irradiated iron
title_short	Effects of precipitates and dislocation loops on the yield stress of irradiated iron
title_full	Effects of precipitates and dislocation loops on the yield stress of irradiated iron
title_fullStr	Effects of precipitates and dislocation loops on the yield stress of irradiated iron
title_full_unstemmed	Effects of precipitates and dislocation loops on the yield stress of irradiated iron
title_sort	effects of precipitates and dislocation loops on the yield stress of irradiated iron
publisher	Nature Portfolio
publishDate	2018
url	https://doaj.org/article/ac0ca6f173614d4a9b7044440cba72ec
work_keys_str_mv	AT arttulehtinen effectsofprecipitatesanddislocationloopsontheyieldstressofirradiatediron AT lasselaurson effectsofprecipitatesanddislocationloopsontheyieldstressofirradiatediron AT fredricgranberg effectsofprecipitatesanddislocationloopsontheyieldstressofirradiatediron AT kainordlund effectsofprecipitatesanddislocationloopsontheyieldstressofirradiatediron AT mikkojalava effectsofprecipitatesanddislocationloopsontheyieldstressofirradiatediron
_version_	1718393999483469824

Effects of precipitates and dislocation loops on the yield stress of irradiated iron

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