Nanoparticles-strengthened high-entropy alloys for cryogenic applications showing an exceptional strength-ductility synergy

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

15 Scopus Citations
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Author(s)

  • Y. L. Zhao
  • J. H. Luan
  • B. Han
  • J. Wei

Detail(s)

Original languageEnglish
Pages (from-to)30-35
Journal / PublicationScripta Materialia
Volume164
Online published29 Jan 2019
Publication statusPublished - 15 Apr 2019

Abstract

We designed a novel nanoparticles-strengthened high-entropy alloy, Ni30Co30Fe13Cr15Al6Ti6, which exhibits excellent strength-ductility combinations at both ambient and cryogenic temperatures. Especially at 77 K, an exceptional strength-ductility synergy can be observed, showing an ultrahigh tensile strength of 1.7 GPa and a large ductility of 51%, accompanied by a distinctive three-stage strain-hardening response. The precipitation-hardening behaviors and deformation micro-mechanisms were carefully investigated by the atom probe tomography and transmission electron microscope. The dynamic formation of nano-spaced stacking faults contributed to improved strain-hardening capacities, resulting in simultaneous enhancements of plastic deformation stability and tensile ductility at such high-strength levels.

Research Area(s)

  • High-entropy alloy, Mechanical properties, Nanoparticle strengthening, Stacking-fault-induced plasticity

Citation Format(s)