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

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

机构地区：[1]Department of Mechanical Engineering,City University of Hong Kong,Hong Kong,China [2]Nano-Manufacturing Laboratory(NML),Shenzhen Research Institute of City University of Hong Kong,Shenzhen 518057,China [3]Chengdu Research Institute,City University of Hong Kong,Chengdu 610200,China [4]Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China [5]Department of Mechanical and Automation Engineering,The Chinese University of Hong Kong,Hong Kong,China [6]Department of Mechanical Engineering,The University of Hong Kong,Hong Kong,China

出　　处：《Journal of Materials Science & Technology》2024年第4期150-161,共12页材料科学技术（英文版）

基　　金：supported by Shenzhen-Hong Kong-Macao Science and Technology Program(Category C)(No.SGDX2020110309300301);Key R&D Program from the Science and Technology Department of Sichuan Province(Key Science&Technology Project)(No.2022YFSY0001);Changsha Municipal Science and Technology Bureau(No.kh2201035);the Innovation and Technology Commission of Hong Kong(No.GHP/221/21GD).

摘　　要：Amorphous/nanocrystalline dual-phase structures have recently emerged as an effective way for over-coming the strength-ductility trade-offand 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.

关 键 词：NANOLAMINATES Dual-phase nanocomposites In situ transmission electron microscopy Multi-component alloy 

分 类 号：TG146.23[一般工业技术—材料科学与工程]