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Title: Ultrahigh strength and ductility in newly developed materials with coherent nanolamellar architectures
Authors: Fan, L 
Yang, T
Zhao, Y
Luan, J
Zhou, G
Wang, H
Jiao, Z 
Liu, CT
Issue Date: 2020
Source: Nature communications, 2020, v. 11, no. 1, 6240, p. 1-8
Abstract: Nano-lamellar materials with ultrahigh strengths and unusual physical properties are of technological importance for structural applications. However, these materials generally suffer from low tensile ductility, which severely limits their practical utility. Here we show that markedly enhanced tensile ductility can be achieved in coherent nano-lamellar alloys, which exhibit an unprecedented combination of over 2 GPa yield strength and 16% uniform tensile ductility. The ultrahigh strength originates mainly from the lamellar boundary strengthening, whereas the large ductility correlates to a progressive work-hardening mechanism regulated by the unique nano-lamellar architecture. The coherent lamellar boundaries facilitate the dislocation transmission, which eliminates the stress concentrations at the boundaries. Meanwhile, deformation-induced hierarchical stacking-fault networks and associated high-density Lomer-Cottrell locks enhance the work hardening response, leading to unusually large tensile ductilities. The coherent nano-lamellar strategy can potentially be applied to many other alloys and open new avenues for designing ultrastrong yet ductile materials for technological applications.
Publisher: Nature Publishing Group
Journal: Nature communications 
EISSN: 2041-1723
DOI: 10.1038/s41467-020-20109-z
Rights: © The Author(s) 2020
This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
The following publication Fan, L., Yang, T., Zhao, Y. et al. Ultrahigh strength and ductility in newly developed materials with coherent nanolamellar architectures. Nat Commun 11, 6240 (2020) is available at https://doi.org/10.1038/s41467-020-20109-z
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