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Ultrahigh-strength and ductile superlattice alloys with nanoscale disordered interfaces
- Source :
- Science (New York, N.Y.). 369(6502)
- Publication Year :
- 2020
-
Abstract
- 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.
- Subjects :
- 010302 applied physics
Multidisciplinary
Superlattice
Alloy
02 engineering and technology
Intergranular corrosion
engineering.material
021001 nanoscience & nanotechnology
01 natural sciences
Brittleness
0103 physical sciences
Ultimate tensile strength
engineering
Dislocation
Composite material
0210 nano-technology
Ductility
Softening
Subjects
Details
- ISSN :
- 10959203
- Volume :
- 369
- Issue :
- 6502
- Database :
- OpenAIRE
- Journal :
- Science (New York, N.Y.)
- Accession number :
- edsair.doi.dedup.....9e5e3ce9e987ecfe3be1f93fe4962376