Lightweight and ultrastrong 3D nanoarchitected high-entropy ceramic metamaterials.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 41105781.
- Also identified by DOI 10.1126/sciadv.adw6632 and PMC identifier 12533655.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
Three-dimensional (3D) nanoarchitecture ceramics, such as ceramic nanolattices, have attracted intensive research interest due to good thermal stability, oxidation resistance, and damage tolerance. The high performance of lightweight ceramic nanolattices is still a goal to pursue. Herein, we report a high-entropy ceramic (HEC) 3D architecture with feature size down to 150 nanometers, exhibiting simultaneous high strength and energy absorption. A versatile strategy is proposed to synthesize fully transparent precursors with metal salt loading of up to 70%, which allows for high-resolution optical nanofabrication. Combining two-photon polymerization with a two-step sintering process, we fabricate fully dense and high-fidelity HEC 3D architectures. The high-entropy effect promotes the generation of high-density dislocations, thus enhancing both the strength and ductility of HEC nanolattices. This study demonstrates a promising strategy for developing exceptional-performance ceramics, with engineering application prospects in mechanical metamaterials, nanoelectromechanical systems, and damage-tolerant lightweight materials.