Wang Yongwei, Chen Jiashu, Li Mo, Zheng Guangping
Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China.
Department of Mechanical Engineering, Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China.
Materials (Basel). 2025 Apr 17;18(8):1853. doi: 10.3390/ma18081853.
The glass-glass interfaces (GGIs) play an important role during the plastic deformation of metallic nano-glasses (NGs) such as Sc-Fe NGs. In this work, Co-P nano-glasses are synthesized by pulse electrodeposition. Their mechanical properties are characterized by micro-pillar compression and compared to those obtained by molecular dynamics (MD) simulation. The MD simulation reveals that the GGIs with a particular incline angle (about 50.0°) in the direction of applied uniaxial strain is preferable for the accommodation of localized plastic deformation in NGs. The results are consistent with those obtained by spherical aberration-corrected transmission electron microscopy, which reveals that most of shear bands form an angle of about 58.7° to the direction of compressive strain applied on the Co-P micro-pillar. The phenomena are explained with the differences in chemical composition and atom diffusion in the glassy grain interiors and in the GGI regions. This work sheds some light on the deformation mechanisms of NGs and provides guidelines for designing NGs with improved mechanical properties.
玻璃-玻璃界面（GGIs）在诸如Sc-Fe纳米玻璃（NGs）等金属纳米玻璃的塑性变形过程中起着重要作用。在这项工作中，通过脉冲电沉积合成了Co-P纳米玻璃。它们的力学性能通过微柱压缩进行表征，并与通过分子动力学（MD）模拟获得的性能进行比较。MD模拟表明，在施加单轴应变方向上具有特定倾斜角（约50.0°）的GGIs更有利于容纳NGs中的局部塑性变形。该结果与通过球差校正透射电子显微镜获得的结果一致，后者表明大多数剪切带与施加在Co-P微柱上的压缩应变方向形成约58.7°的角度。这些现象可以用玻璃态晶粒内部和GGI区域中化学成分和原子扩散的差异来解释。这项工作为NGs的变形机制提供了一些启示，并为设计具有改进力学性能的NGs提供了指导。
