首页|Hierarchical crystalline-amorphous nanocomposites with high strength and large deformability enabled by elemental diffusion

Hierarchical crystalline-amorphous nanocomposites with high strength and large deformability enabled by elemental diffusion

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Amorphous/nanocrystalline dual-phase structures have recently emerged as an effective way for over-coming the strength-ductility trade-off and breaking the limitation of the reverse Hall-Petch effect.Here,we proposed a new strategy to develop a hierarchical and interconnected amorphous-crystalline nanocomposite arising from the nanoscale elemental interdiffusion and oxygen adsorption behavior dur-ing thermal treatment processes.The nanocomposite consisted of a three-dimensional(3D)hierarchical network structure where the crystalline phase(Cr-Co-Ni-Al)was embedded into the Al-O-based amor-phous phase network with critical feature sizes encompassing three orders of magnitude(from microm-eter to nanometer scale).It can achieve ultrahigh compression yield strength of～3.6 GPa with large homogeneous deformation of over 50％strain.The massive interstitial atoms induced lattice distortion and hierarchical amorphous phase boundary contributed to the strength improvement.in situ Uniaxial compression inside a transmission electron microscope(TEM)revealed that the exceptional deformability of the nanocomposites resulted from the homogenous plastic flow of nano-sized amorphous phase and the plastic co-deformation behavior restricted by the nano-architected dual-phase interface.The proposed dual-phase synthesis approach can outperform conventional nanolaminates design strategies in terms of the mechanical properties achievable while providing a pathway to easily tune the microstructure of these nanolaminates.

NanolaminatesDual-phase nanocompositesIn situ transmission electron microscopyMulti-component alloy

Liqiang Wang、Heyi Wang、Xin Zhou、Huangliu Fu、James Utama Surjadi、Shuo Qu、Xu Song、Rong Fan、Yang Lu

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Department of Mechanical Engineering,City University of Hong Kong,Hong Kong,China

Nano-Manufacturing Laboratory(NML),Shenzhen Research Institute of City University of Hong Kong,Shenzhen 518057,China

Chengdu Research Institute,City University of Hong Kong,Chengdu 610200,China

Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China

Department of Mechanical and Automation Engineering,The Chinese University of Hong Kong,Hong Kong,China

Department of Mechanical Engineering,The University of Hong Kong,Hong Kong,China

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Shenzhen-Hong Kong-Macau Science and Technology Program(Category C)Key R&D Program from the Science and Technology Department of Sichuan Province(Key Science & Technology Project)Changsha Municipal Science and Technology BureauInnovation and Technology Commission of Hong Kong

SGDX20201103093003012022YFSY0001kh2201035GHP/221/21GD

2024

10.1016/j.jmst.2023.06.046

材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

CSTPCD
影响因子：0.657
ISSN：1005-0302
年,卷(期)：2024.171(4)
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