Superior High-Temperature Strength in a Supersaturated Refractory High-Entropy Alloy

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

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Author(s)

  • Rui Feng
  • Bojun Feng
  • Michael C. Gao
  • Chuan Zhang
  • Joerg C. Neuefeind
  • Jonathan D. Poplawsky
  • Ke An
  • Michael Widom
  • Peter K. Liaw

Detail(s)

Original languageEnglish
Article number2102401
Number of pages9
Journal / PublicationAdvanced Materials
Volume33
Issue number48
Online published8 Oct 2021
Publication statusPublished - 2 Dec 2021
Externally publishedYes

Abstract

Refractory high-entropy alloys (RHEAs) show promising applications at high temperatures. However, achieving high strengths at elevated temperatures above 1173K is still challenging due to heat softening. Using intrinsic material characteristics as the alloy-design principles, a single-phase body-centered-cubic (BCC) CrMoNbV RHEA with high-temperature strengths (beyond 1000 MPa at 1273 K) is designed, superior to other reported RHEAs as well as conventional superalloys. The origin of the high-temperature strength is revealed by in situ neutron scattering, transmission-electron microscopy, and first-principles calculations. The CrMoNbV's elevated-temperature strength retention up to 1273 K arises from its large atomic-size and elastic-modulus mismatches, the insensitive temperature dependence of elastic constants, and the dominance of non-screw character dislocations caused by the strong solute pinning, which makes the solid-solution strengthening pronounced. The alloy-design principles and the insights in this study pave the way to design RHEAs with outstanding high-temperature strength.

Research Area(s)

  • alloy design, high-temperature strength, neutron scattering, phase stability, refractory high-entropy alloy

Citation Format(s)

Superior High-Temperature Strength in a Supersaturated Refractory High-Entropy Alloy. / Feng, Rui; Feng, Bojun; Gao, Michael C.; Zhang, Chuan; Neuefeind, Joerg C.; Poplawsky, Jonathan D.; Ren, Yang; An, Ke; Widom, Michael; Liaw, Peter K.

In: Advanced Materials, Vol. 33, No. 48, 2102401, 02.12.2021.

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