Improvement of structural efficiency in metals by the control of topological arrangements in ultrafine and coarse grains
Shokry, Abdallah LU ; Ahadi, Aylin LU ; Ståhle, Per LU and Orlov, Dmytro LU
(2021)
In Scientific Reports
11(1).
- 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... (More)
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.
(Less)
- author
- Shokry, Abdallah
LU
; Ahadi, Aylin
LU
; Ståhle, Per
LU
and Orlov, Dmytro
LU
- organization
- publishing date
- 2021
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Scientific Reports
- volume
- 11
- issue
- 1
- article number
- 17445
- publisher
- Nature Publishing Group
- external identifiers
-
- pmid:34465824
- scopus:85113927970
- ISSN
- 2045-2322
- DOI
- 10.1038/s41598-021-96930-3
- project
- Topological control of microstructures for advanced material engineering
- language
- English
- LU publication?
- yes
- id
- 77e7b9f4-6008-496c-b85a-1847d7b6ab38
- date added to LUP
- 2021-09-04 21:26:28
- date last changed
- 2024-07-13 18:03:20
@article{77e7b9f4-6008-496c-b85a-1847d7b6ab38,
abstract = {{<p>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.</p>}},
author = {{Shokry, Abdallah and Ahadi, Aylin and Ståhle, Per and Orlov, Dmytro}},
issn = {{2045-2322}},
language = {{eng}},
number = {{1}},
publisher = {{Nature Publishing Group}},
series = {{Scientific Reports}},
title = {{Improvement of structural efficiency in metals by the control of topological arrangements in ultrafine and coarse grains}},
url = {{http://dx.doi.org/10.1038/s41598-021-96930-3}},
doi = {{10.1038/s41598-021-96930-3}},
volume = {{11}},
year = {{2021}},
}