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Exceptional enhancement of mechanical properties in high-entropy alloys via thermodynamically guided local chemical ordering
Understanding the local chemical ordering propensity in random solid solutions, and tailoring its strength, can guide the design and discovery of complex, paradigm-shifting multicomponent alloys. First, we present a simple thermodynamic framework, based solely on binary enthalpies of mixing, to sele...
Autores principales: | , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
National Academy of Sciences
2023
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10265979/ https://www.ncbi.nlm.nih.gov/pubmed/37252982 http://dx.doi.org/10.1073/pnas.2211787120 |
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author | Dasari, Sriswaroop Sharma, Abhishek Jiang, Chao Gwalani, Bharat Lin, Wei-Chih Lo, Kai-Chi Gorsse, Stéphane Yeh, An-Chou Srinivasan, Srivilliputhur G. Banerjee, Rajarshi |
author_facet | Dasari, Sriswaroop Sharma, Abhishek Jiang, Chao Gwalani, Bharat Lin, Wei-Chih Lo, Kai-Chi Gorsse, Stéphane Yeh, An-Chou Srinivasan, Srivilliputhur G. Banerjee, Rajarshi |
author_sort | Dasari, Sriswaroop |
collection | PubMed |
description | Understanding the local chemical ordering propensity in random solid solutions, and tailoring its strength, can guide the design and discovery of complex, paradigm-shifting multicomponent alloys. First, we present a simple thermodynamic framework, based solely on binary enthalpies of mixing, to select optimal alloying elements to control the nature and extent of chemical ordering in high-entropy alloys (HEAs). Next, we couple high-resolution electron microscopy, atom probe tomography, hybrid Monte-Carlo, special quasirandom structures, and density functional theory calculations to demonstrate how controlled additions of Al and Ti and subsequent annealing drive chemical ordering in nearly random equiatomic face-centered cubic CoFeNi solid solution. We establish that short-range ordered domains, the precursors of long-range ordered precipitates, inform mechanical properties. Specifically, a progressively increasing local order boosts the tensile yield strengths of the parent CoFeNi alloy by a factor of four while also substantially improving ductility, which breaks the so-called strength–ductility paradox. Finally, we validate the generality of our approach by predicting and demonstrating that controlled additions of Al, which has large negative enthalpies of mixing with the constituent elements of another nearly random body-centered cubic refractory NbTaTi HEA, also introduces chemical ordering and enhances mechanical properties. |
format | Online Article Text |
id | pubmed-10265979 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2023 |
publisher | National Academy of Sciences |
record_format | MEDLINE/PubMed |
spelling | pubmed-102659792023-11-30 Exceptional enhancement of mechanical properties in high-entropy alloys via thermodynamically guided local chemical ordering Dasari, Sriswaroop Sharma, Abhishek Jiang, Chao Gwalani, Bharat Lin, Wei-Chih Lo, Kai-Chi Gorsse, Stéphane Yeh, An-Chou Srinivasan, Srivilliputhur G. Banerjee, Rajarshi Proc Natl Acad Sci U S A Physical Sciences Understanding the local chemical ordering propensity in random solid solutions, and tailoring its strength, can guide the design and discovery of complex, paradigm-shifting multicomponent alloys. First, we present a simple thermodynamic framework, based solely on binary enthalpies of mixing, to select optimal alloying elements to control the nature and extent of chemical ordering in high-entropy alloys (HEAs). Next, we couple high-resolution electron microscopy, atom probe tomography, hybrid Monte-Carlo, special quasirandom structures, and density functional theory calculations to demonstrate how controlled additions of Al and Ti and subsequent annealing drive chemical ordering in nearly random equiatomic face-centered cubic CoFeNi solid solution. We establish that short-range ordered domains, the precursors of long-range ordered precipitates, inform mechanical properties. Specifically, a progressively increasing local order boosts the tensile yield strengths of the parent CoFeNi alloy by a factor of four while also substantially improving ductility, which breaks the so-called strength–ductility paradox. Finally, we validate the generality of our approach by predicting and demonstrating that controlled additions of Al, which has large negative enthalpies of mixing with the constituent elements of another nearly random body-centered cubic refractory NbTaTi HEA, also introduces chemical ordering and enhances mechanical properties. National Academy of Sciences 2023-05-30 2023-06-06 /pmc/articles/PMC10265979/ /pubmed/37252982 http://dx.doi.org/10.1073/pnas.2211787120 Text en Copyright © 2023 the Author(s). Published by PNAS. https://creativecommons.org/licenses/by-nc-nd/4.0/This article is distributed under Creative Commons Attribution-NonCommercial-NoDerivatives License 4.0 (CC BY-NC-ND) (https://creativecommons.org/licenses/by-nc-nd/4.0/) . |
spellingShingle | Physical Sciences Dasari, Sriswaroop Sharma, Abhishek Jiang, Chao Gwalani, Bharat Lin, Wei-Chih Lo, Kai-Chi Gorsse, Stéphane Yeh, An-Chou Srinivasan, Srivilliputhur G. Banerjee, Rajarshi Exceptional enhancement of mechanical properties in high-entropy alloys via thermodynamically guided local chemical ordering |
title | Exceptional enhancement of mechanical properties in high-entropy alloys via thermodynamically guided local chemical ordering |
title_full | Exceptional enhancement of mechanical properties in high-entropy alloys via thermodynamically guided local chemical ordering |
title_fullStr | Exceptional enhancement of mechanical properties in high-entropy alloys via thermodynamically guided local chemical ordering |
title_full_unstemmed | Exceptional enhancement of mechanical properties in high-entropy alloys via thermodynamically guided local chemical ordering |
title_short | Exceptional enhancement of mechanical properties in high-entropy alloys via thermodynamically guided local chemical ordering |
title_sort | exceptional enhancement of mechanical properties in high-entropy alloys via thermodynamically guided local chemical ordering |
topic | Physical Sciences |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10265979/ https://www.ncbi.nlm.nih.gov/pubmed/37252982 http://dx.doi.org/10.1073/pnas.2211787120 |
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