Borrowed dislocations for ductility in ceramics

• 成果类型: Article
• 署名作者: Dong, L. R.; Zhang, J.; Li, Y. Z.; Gao, Y. X.; Wang, M.; Huang, M. X.; Wang, J. S.; Chen, K. X.
• 署名单位: Beijing University of Technology; University of Hong Kong; University of Science & Technology Beijing
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-10767
• DOI: 10.1126/science.adp0559
• 发表日期: 2024-07-26
• 页码: 422-427
• 关键词: silicon-nitride ceramics; room-temperature; plasticity; strength; diamond; tough

摘要

The inherent brittleness of ceramics, primarily due to restricted atomic motions from rigid ionic or covalent bonded structures, is a persistent challenge. This characteristic hinders dislocation nucleation in ceramics, thereby impeding the enhancement of plasticity through a dislocation-engineering strategy commonly used in metals. Finding a strategy that continuously generates dislocations within ceramics may enhance plasticity. Here, we propose a borrowing-dislocations strategy that uses a tailored interfacial structure with well-ordered bonds. Such an approach enables ceramics to have greatly improved tensile ductility by mobilizing a considerable number of dislocations in ceramic borrowed from metal through the interface, thereby overcoming the challenge associated with direct dislocation nucleation within ceramics. This strategy provides a way to enhance tensile ductility in ceramics.