Li Tian, Li Nana, Zhang Shengming, Zheng Guangping
CDGM Glass Co., Ltd., Chengdu, 610199, China.
Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, 999077, Hong Kong SAR, China.
Sci Rep. 2024 Mar 29;14(1):7458. doi: 10.1038/s41598-024-58247-9.
The glass-glass interfaces (GGIs) are in a unique glass phase, while current knowledge on the interfacial phase has not completely established to explain the unprecedented improvements in the ductility of metallic nanoglasses (NGs). In this work, Co-P NGs prepared through the pulse electrodeposition are investigated, whose GGI regions clearly show elemental segregation with chemical composition dominated by element Co. Such compositional heterogeneity is further verified by molecular dynamics (MD) simulation on the formation of GGIs in Co-P NGs and atomic structures of GGIs with Co segregation are found to be less dense than those of glassy grains. More importantly, Co segregation at GGIs is closely related to the improved ductility observed in Co-P NGs, as demonstrated by nanoindentation measurements and MD simulations. This work facilitates the understanding on the relations between compositional heterogeneity and improved ductility as observed in Co-P NGs, and thus opens a new window for controlling the mechanical properties of NGs through GGI engineering.
玻璃-玻璃界面（GGIs）处于独特的玻璃相中，然而目前关于界面相的知识尚未完全建立起来，无法解释金属纳米玻璃（NGs）在延展性方面前所未有的提升。在这项工作中，对通过脉冲电沉积制备的Co-P纳米玻璃进行了研究，其GGI区域明显显示出元素偏析，化学成分以Co元素为主导。通过分子动力学（MD）模拟对Co-P纳米玻璃中GGIs的形成进行进一步验证，发现具有Co偏析的GGIs的原子结构比玻璃晶粒的原子结构密度更低。更重要的是，正如纳米压痕测量和MD模拟所表明的，GGIs处的Co偏析与Co-P纳米玻璃中观察到的延展性提高密切相关。这项工作有助于理解Co-P纳米玻璃中观察到的成分不均匀性与延展性提高之间的关系，从而为通过GGI工程控制纳米玻璃的力学性能打开了一扇新窗口。
