Temperature dependence of elastic and plastic deformation behavior of a refractory high-entropy alloy

Chanho Lee, George Kim, Yi-Chia Chou, Brianna L. Musico, Michael C. Gao, Ke An, Gian Song, Yi-Chia Chou, Veerle Keppens, Wei Chen, Peter K. Liaw*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Single-phase solid-solution refractory high-entropy alloys (HEAs) show remarkable mechanical properties, such as their high yield strength and substantial softening resistance at elevated temperatures. Hence, the in-depth study of the deformation behavior for body-centered cubic (BCC) refractory HEAs is a critical issue to explore the uncovered/unique deformation mechanisms. We have investigated the elastic and plastic deformation behaviors of a single BCC NbTaTiV refractory HEA at elevated temperatures using integrated experimental efforts and theoretical calculations. The in situ neutron diffraction results reveal a temperature-dependent elastic anisotropic deformation behavior. The single-crystal elastic moduli and macroscopic Young's, shear, and bulk moduli were determined from the in situ neutron diffraction, showing great agreement with first-principles calculations, machine learning, and resonant ultrasound spectroscopy results. Furthermore, the edge dislocation-dominant plastic deformation behaviors, which are different from conventional BCC alloys, were quantitatively described by the Williamson-Hall plot profile modeling and high-angle annular dark-field scanning transmission electron microscopy.

Original languageEnglish
Article numbereaaz4748
Number of pages12
JournalScience Advances
Volume6
Issue number37
DOIs
StatePublished - Sep 2020

Keywords

  • SITU NEUTRON-DIFFRACTION
  • DISLOCATIONS
  • PREDICTIONS
  • CONSTANTS
  • MODEL

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