期刊
SCIENCE
卷 369, 期 6502, 页码 427-+出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.abb6830
关键词
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资金
- Hong Kong Research Grant Council (RGC)
- CityU [11213319, 11202718, 9360161]
- National Natural Science Foundation of China [51701125, NSFC 51801169]
- Natural Science Foundation of Shenzhen University [827-000180]
- Hong Kong RGC [25202719]
Alloys that have high strengths at high temperatures are crucial for a variety of important industries including aerospace. Alloys with ordered superlattice structures are attractive for this purpose but generally suffer from poor ductility and rapid grain coarsening. We discovered that nanoscale disordered interfaces can effectively overcome these problems. Interfacial disordering is driven by multielement cosegregation that creates a distinctive nanolayer between adjacent micrometer-scale superlattice grains. This nanolayer acts as a sustainable ductilizing source, which prevents brittle intergranular fractures by enhancing dislocation mobilities. Our superlattice materials have ultrahigh strengths of 1.6 gigapascals with tensile ductilities of 25% at ambient temperature. Simultaneously, we achieved negligible grain coarsening with exceptional softening resistance at elevated temperatures. Designing similar nanolayers may open a pathway for further optimization of alloy properties.
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