Improvement of structural efficiency in metals by the control of topological arrangements in ultrafine and coarse grains

Abstract Improvement of structural efficiency in various materials is critically important for sustainable society development and the efficient use of natural resources. Recently, a lot of attention in science and engineering has been attracted to heterogeneous-structure materials because of high s...

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Autores principales:	Abdallah Shokry, Aylin Ahadi, Per Ståhle, Dmytro Orlov
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/a65a7dcc5bb345f29008a29d5502dcca
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spelling	oai:doaj.org-article:a65a7dcc5bb345f29008a29d5502dcca2021-12-02T19:04:35ZImprovement of structural efficiency in metals by the control of topological arrangements in ultrafine and coarse grains10.1038/s41598-021-96930-32045-2322https://doaj.org/article/a65a7dcc5bb345f29008a29d5502dcca2021-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-96930-3https://doaj.org/toc/2045-2322Abstract Improvement of structural efficiency in various materials is critically important for sustainable society development and the efficient use of natural resources. Recently, a lot of attention in science and engineering has been attracted to heterogeneous-structure materials because of high structural efficiency. However, strategies for the efficient design of heterogenous structures are still in their infancy therefore demanding extensive exploration. In this work, two-dimensional finite-element models for pure nickel with bimodal distributions of grain sizes having ‘harmonic’ and ‘random’ spatial topological arrangements of coarse and ultrafine-grain areas are developed. The bimodal random-structure material shows heterogeneities in stress–strain distributions at all scale levels developing immediately upon loading, which leads to developing concentrations of strain and premature global plastic instability. The bimodal harmonic-structure material demonstrates strength and ductility significantly exceeding those in the bimodal random-structure as well as expectations from a rule of mixtures. The strain hardening rates also significantly exceed those in homogeneous materials while being primarily controlled by coarse-grain phase at the early, by ultrafine-grain at the later and by their compatible straining at the intermediate stages of loading. The study emphasises the importance of topological ultrafine-/coarse-grain distributions, and the continuity of the ultrafine-grain skeleton in particular.Abdallah ShokryAylin AhadiPer StåhleDmytro OrlovNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-14 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Abdallah Shokry Aylin Ahadi Per Ståhle Dmytro Orlov Improvement of structural efficiency in metals by the control of topological arrangements in ultrafine and coarse grains
description	Abstract Improvement of structural efficiency in various materials is critically important for sustainable society development and the efficient use of natural resources. Recently, a lot of attention in science and engineering has been attracted to heterogeneous-structure materials because of high structural efficiency. However, strategies for the efficient design of heterogenous structures are still in their infancy therefore demanding extensive exploration. In this work, two-dimensional finite-element models for pure nickel with bimodal distributions of grain sizes having ‘harmonic’ and ‘random’ spatial topological arrangements of coarse and ultrafine-grain areas are developed. The bimodal random-structure material shows heterogeneities in stress–strain distributions at all scale levels developing immediately upon loading, which leads to developing concentrations of strain and premature global plastic instability. The bimodal harmonic-structure material demonstrates strength and ductility significantly exceeding those in the bimodal random-structure as well as expectations from a rule of mixtures. The strain hardening rates also significantly exceed those in homogeneous materials while being primarily controlled by coarse-grain phase at the early, by ultrafine-grain at the later and by their compatible straining at the intermediate stages of loading. The study emphasises the importance of topological ultrafine-/coarse-grain distributions, and the continuity of the ultrafine-grain skeleton in particular.
format	article
author	Abdallah Shokry Aylin Ahadi Per Ståhle Dmytro Orlov
author_facet	Abdallah Shokry Aylin Ahadi Per Ståhle Dmytro Orlov
author_sort	Abdallah Shokry
title	Improvement of structural efficiency in metals by the control of topological arrangements in ultrafine and coarse grains
title_short	Improvement of structural efficiency in metals by the control of topological arrangements in ultrafine and coarse grains
title_full	Improvement of structural efficiency in metals by the control of topological arrangements in ultrafine and coarse grains
title_fullStr	Improvement of structural efficiency in metals by the control of topological arrangements in ultrafine and coarse grains
title_full_unstemmed	Improvement of structural efficiency in metals by the control of topological arrangements in ultrafine and coarse grains
title_sort	improvement of structural efficiency in metals by the control of topological arrangements in ultrafine and coarse grains
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/a65a7dcc5bb345f29008a29d5502dcca
work_keys_str_mv	AT abdallahshokry improvementofstructuralefficiencyinmetalsbythecontroloftopologicalarrangementsinultrafineandcoarsegrains AT aylinahadi improvementofstructuralefficiencyinmetalsbythecontroloftopologicalarrangementsinultrafineandcoarsegrains AT perstahle improvementofstructuralefficiencyinmetalsbythecontroloftopologicalarrangementsinultrafineandcoarsegrains AT dmytroorlov improvementofstructuralefficiencyinmetalsbythecontroloftopologicalarrangementsinultrafineandcoarsegrains
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Improvement of structural efficiency in metals by the control of topological arrangements in ultrafine and coarse grains

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