Hierarchical crystalline-amorphous nanocomposites with high strength and large deformability enabled by elemental diffusion
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY(2024)
摘要
Amorphous/nanocrystalline dual-phase structures have recently emerged as an effective way for overcoming 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 during 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 amorphous phase network with critical feature sizes encompassing three orders of magnitude (from micrometer to nanometer scale). It can achieve ultrahigh compression yield strength of & SIM;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 nanosized amorphous phase and the plastic co-deformation behavior restricted by the nanoarchitected 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.& COPY; 2023 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
更多查看译文
关键词
Nanolaminates,Dual-phase nanocomposites,In situ transmission electron microscopy,Multi-component alloy
AI 理解论文
溯源树
样例
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要