Guo Yongchang, Li Jianqiang, Zhang Ying, Feng Shaowei, Sun Hong
CAS Key Laboratory of Green Process and Engineering, National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, P. R. China.
University of Chinese Academy of Sciences, Beijing 100049, P. R. China.
iScience. 2021 Jun 17;24(7):102735. doi: 10.1016/j.isci.2021.102735. eCollection 2021 Jul 23.
Glasses with high hardness, high Young's modulus, and high fracture toughness become crucial materials which are urgently needed in the protective covers for various electronic displays. Here, a paradigm is presented that the conceptual design of high-entropy materials is adaptable to high performance oxide glasses. We designed the multi-component glass compositions of 18.77RO-4.83YO-28.22TiO-8.75ZrO-39.43AlO (R = La, Sm, Gd) and elaborated successfully the glassy samples through a containerless solidification process. The as-prepared samples demonstrated the outstanding mechanical and optical properties. The measured hardness, Young's modulus, and indentation fracture toughness of the high-entropy (R = Gd) glass are 12.58 GPa, 177.9 GPa, and 1.52 MPa·m, respectively, in which the hardness and Young's modulus exhibit the highest value among the reported oxide glasses. Structural analysis revealed that the excellent mechanical properties are attributed to the large dissociation energies and the high field strength of AlO, TiO, and ZrO and the complex interaction between atoms caused by high entropy.
具有高硬度、高杨氏模量和高断裂韧性的玻璃成为各种电子显示器保护罩中迫切需要的关键材料。在此，提出了一种范例，即高熵材料的概念设计适用于高性能氧化物玻璃。我们设计了18.77RO-4.83YO-28.22TiO-8.75ZrO-39.43AlO（R = La、Sm、Gd）的多组分玻璃组合物，并通过无容器凝固工艺成功制备出玻璃样品。所制备的样品表现出优异的机械和光学性能。高熵（R = Gd）玻璃的实测硬度、杨氏模量和压痕断裂韧性分别为12.58 GPa、177.9 GPa和1.52 MPa·m，其中硬度和杨氏模量在已报道的氧化物玻璃中呈现出最高值。结构分析表明，优异的机械性能归因于AlO、TiO和ZrO的大离解能和高场强以及高熵导致的原子间复杂相互作用。
