2025-11-14 トロント大学(U of T)
Microscopic image of the new metal matrix composite, which mimics the structure of concrete on a tiny scale (photo by Chenwei Shao)
＜関連情報＞
- https://www.utoronto.ca/news/u-t-researchers-develop-ultra-strong-lightweight-metal-composite-can-withstand-extreme-heat
- https://www.nature.com/articles/s41467-025-65234-9
鉄筋コンクリート構造を採用したアルミニウムマトリックス複合材料の機械的性能向上を実現 Achieving improved mechanical performance in aluminum matrix composites with rebar-reinforced concrete-inspired structures
Chenwei Shao,Huicong Chen & Yu Zou
Nature Communications Published:27 October 2025
DOI:https://doi.org/10.1038/s41467-025-65234-9
Abstract
The strength of aluminum matrix composites (AMCs) often suffers from degradation at elevated temperatures, rendering them generally unsuitable for use in high-temperature environments. Inspired by ubiquitous rebar steel-reinforced concrete (RC) structures, we develop a series of RC-like AMCs by integrating the additive manufacturing and micro-casting methods. Such RC-AMC, with a high volume fraction of thermotolerant particulate reinforcements, effectively mitigate the strength degradation up to 500 °C. Through structural optimization, we demonstrate that such RC-AMCs achieve extraordinarily high compressive yield strength (up to 938 MPa) and specific strength (up to 235 kN·m/kg) at 400 °C — among the highest reported values for all the aluminum-based alloys and composites. The enhanced resistance to high-temperature softening in RC-AMCs is associated with abnormal thermal twinning in Al3Ti when the temperature increases. This design strategy, combining anomalous temperature-dependent deformation behavior and multiscale reinforcing architectures, offers a pathway toward structure-material integrated manufacturing for a wide range of engineering alloys and composites.
