An order-disorder core-shell strategy for enhanced work-hardening capability and ductility in nanostructured alloys

Fenghui Duan, Qian Li, Zhihao Jiang, Lin Zhou, Junhua Luan, Zheling Shen, Weihua Zhou, Shiyuan Zhang, Jie Pan, Xin Zhou, Tao Yang () and Jian Lu ()
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Fenghui Duan: Department of Mechanical Engineering, City University of Hong Kong
Qian Li: City University of Hong Kong
Zhihao Jiang: Department of Mechanical Engineering, City University of Hong Kong
Lin Zhou: Department of Mechanical Engineering, City University of Hong Kong
Junhua Luan: City University of Hong Kong
Zheling Shen: Institute of Metal Research, Chinese Academy of Sciences
Weihua Zhou: Institute of Metal Research, Chinese Academy of Sciences
Shiyuan Zhang: Institute of Metal Research, Chinese Academy of Sciences
Jie Pan: Huazhong University of Science and Technology
Xin Zhou: City University of Hong Kong
Tao Yang: City University of Hong Kong
Jian Lu: Department of Mechanical Engineering, City University of Hong Kong

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: Abstract Nanocrystalline metallic materials have the merit of high strength but usually suffer from poor ductility and rapid grain coarsening, limiting their practical application. Here, we introduce a core-shell nanostructure in a multicomponent alloy to address these challenges simultaneously, achieving a high tensile strength of 2.65 GPa, a large uniform elongation of 17%, and a high thermal stability of 1173 K. Our strategy relies on an ordered superlattice structure that excels in dislocation accumulation, encased by a ≈3 nm disordered face-centered-cubic nanolayer acting as dislocation sources. The ordered superlattice with high anti-phase boundary energy retards dislocation motions, promoting their interaction and storage within the nanograins. The disordered interfacial nanolayer promotes dislocation emission and effectively accommodates the plastic strain at grain boundaries, preventing intergranular cracking. Consequently, the order-disorder core-shell nanostructure exhibits enhanced work-hardening capability and large ductility. Moreover, such core-shell nanostructure exhibits high coarsening resistance at elevated temperatures, enabling it high thermal stability. Such a design strategy holds promise for developing high-performance materials.

Date: 2024
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DOI: 10.1038/s41467-024-50984-9

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