Please use this identifier to cite or link to this item:
http://hdl.handle.net/10397/106360
Title: | Ultrahigh-strength and ductile superlattice alloys with nanoscale disordered interfaces | Authors: | Yang, T Zhao, YL Li, WP Yu, CY Luan, JH Lin, DY Fan, L Jiao, ZB Liu, WH Liu, XJ Kai, JJ Huang, JC Liu, CT |
Issue Date: | 24-Jul-2020 | Source: | Science, 24 July 2020, v. 369, no. 6502, p. 427-432 | 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. | Publisher: | American Association for the Advancement of Science (AAAS) | Journal: | Science | EISSN: | 0036-8075 | DOI: | 10.1126/science.abb6830 | Rights: | This is the accepted version of the following article: T. Yang et al. ,Ultrahigh-strength and ductile superlattice alloys with nanoscale disordered interfaces.Science 369, 427-432 (2020), which has been published in https://doi.org/10.1126/science.abb6830. |
Appears in Collections: | Journal/Magazine Article |
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File | Description | Size | Format | |
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Fan_Ultrahigh-Strength_Ductile_Superlattice.pdf | Pre-Published version | 1.17 MB | Adobe PDF | View/Open |
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