Ultrahigh strength and ductility in newly developed materials with coherent nanolamellar architectures

Lei Fan, Tao Yang, Yilu Zhao, Junhua Luan, Gang Zhou, Hao Wang, Zengbao Jiao () and Chain-Tsuan Liu ()
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Lei Fan: The Hong Kong Polytechnic University
Tao Yang: City University of Hong Kong
Yilu Zhao: City University of Hong Kong
Junhua Luan: City University of Hong Kong
Gang Zhou: Chinese Academy of Sciences
Hao Wang: Chinese Academy of Sciences
Zengbao Jiao: The Hong Kong Polytechnic University
Chain-Tsuan Liu: City University of Hong Kong

Nature Communications, 2020, vol. 11, issue 1, 1-8

Abstract: 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.

Date: 2020
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DOI: 10.1038/s41467-020-20109-z

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