Ultrahigh-strength and ductile superlattice alloys with nanoscale disordered interfaces

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • C. Y. Yu
  • J. H. Luan
  • D. Y. Lin
  • L. Fan
  • Z. B. Jiao
  • W. H. Liu
  • X. J. Liu
  • C. T. Liu

Detail(s)

Original languageEnglish
Pages (from-to)427-432
Journal / PublicationScience (New York, N.Y.)
Volume369
Issue number6502
Publication statusPublished - 24 Jul 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.

Citation Format(s)

Ultrahigh-strength and ductile superlattice alloys with nanoscale disordered interfaces. / Yang, T.; Zhao, Y. L.; Li, W. P.; Yu, C. Y.; Luan, J. H.; Lin, D. Y.; Fan, L.; Jiao, Z. B.; Liu, W. H.; Liu, X. J.; Kai, J. J.; Huang, J. C.; Liu, C. T.

In: Science (New York, N.Y.), Vol. 369, No. 6502, 24.07.2020, p. 427-432.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review