Enhancement of strength-ductility trade-off in a high-entropy alloy through a heterogeneous structure

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

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Author(s)

  • S.W. Wu
  • G. Wang
  • Q. Wang
  • Y.D. Jia
  • J. Yi
  • Q.J. Zhai
  • B.A. Sun
  • H.J. Chu
  • J. Shen
  • P.K. Liaw
  • T.Y. Zhang

Detail(s)

Original languageEnglish
Pages (from-to)444-458
Journal / PublicationActa Materialia
Volume165
Online published11 Dec 2018
Publication statusPublished - 15 Feb 2019

Abstract

The improvement in strength is usually accompanied by ductility loss in structural materials, which is a long-standing conflict referred as the strength-ductility trade-off. Here we present a heterogeneous-structures-architecting strategy, in which we design bulk high-entropy alloys with the largely-enhanced strength-ductility trade-off, possessing a yield strength of 711 MPa, a tensile strength of 928 MPa, and a uniform elongation of 30.3%. Such an enhancement of the strength-ductility trade-off is due to the microstructure comprised with a combination of the non-recrystallized and recrystallized grains arranged in complex heterogeneous structures with a characteristic dimension spanning from the submicron scale to the coarse-sized scale. The heterogeneous structures in the high-entropy alloy are produced by cold-rolling, followed by intermediate-temperature-annealing. Our results demonstrate that heterogeneous designs can be accomplished effectively by simple thermal treatments, which offer a design strategy towards a new generation of high-strength and high-ductility high-entropy alloys.

Research Area(s)

  • Dislocation, Heterogeneous structure, High-entropy alloys, Strength-ductility trade-off, Twin

Citation Format(s)

Enhancement of strength-ductility trade-off in a high-entropy alloy through a heterogeneous structure. / Wu, S.W.; Wang, G.; Wang, Q.; Jia, Y.D.; Yi, J.; Zhai, Q.J.; Liu, J.B.; Sun, B.A.; Chu, H.J.; Shen, J.; Liaw, P.K.; Liu, C.T.; Zhang, T.Y.

In: Acta Materialia, Vol. 165, 15.02.2019, p. 444-458.

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