Heterogeneous lattice strain strengthening in severely distorted crystalline solids
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review
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Detail(s)
Original language | English |
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Article number | e2200607119 |
Number of pages | 7 |
Journal / Publication | Proceedings of the National Academy of Sciences of the United States of America |
Volume | 119 |
Issue number | 25 |
Online published | 13 Jun 2022 |
Publication status | Published - 21 Jun 2022 |
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DOI | DOI |
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Link to Scopus | https://www.scopus.com/record/display.uri?eid=2-s2.0-85133877042&origin=recordpage |
Permanent Link | https://scholars.cityu.edu.hk/en/publications/publication(de5cd8b5-13a6-4572-9dd9-988d151a6cda).html |
Abstract
Multi–principal element alloys (MPEAs) exhibit outstanding mechanical properties because the core effect of severe atomic lattice distortion is distinctly different from that of traditional alloys. However, at the mesoscopic scale the underlying physics for the abundant dislocation activities responsible for strength-ductility synergy has not been uncovered. While the Eshelby mean-field approaches become insufficient to tackle yielding and plasticity in severely distorted crystalline solids, here we develop a three-dimensional discrete dislocation dynamics simulation approach by taking into account the experimentally measured lattice strain field from a model FeCoCrNiMn MPEA to explore the heterogeneous strain-induced strengthening mechanisms. Our results reveal that the heterogeneous lattice strain causes unusual dislocation behaviors (i.e., multiple kinks/jogs and bidirectional cross slips), resulting in the strengthening mechanisms that underpin the strength-ductility synergy. The outcome of our research sheds important insights into the design of strong yet ductile distorted crystalline solids, such as high-entropy alloys and high-entropy ceramics.
Research Area(s)
- discrete dislocation dynamics, dislocation kink/jog, heterogeneous lattice strain, Multi–principal element alloys, strengthening mechanism
Citation Format(s)
Heterogeneous lattice strain strengthening in severely distorted crystalline solids. / Li, Jia; Chen, Yang; He, Quanfeng et al.
In: Proceedings of the National Academy of Sciences of the United States of America, Vol. 119, No. 25, e2200607119, 21.06.2022.
In: Proceedings of the National Academy of Sciences of the United States of America, Vol. 119, No. 25, e2200607119, 21.06.2022.
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review
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