Temperature-dependent compression behavior of an Al 0.5 CoCrCuFeNi high-entropy alloy

X. D. Xu, S. Y. Chen, Y. Ren, Akihiko Hirata, T. Fujita, P. K. Liaw, M. W. Chen

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Mechanical response of an Al 0.5 CoCrCuFeNi high-entropy alloy (HEA) was investigated through uniaxial compression tests, the 0.2% offset yield strength decreases with increasing temperature up to 773 K. However, at temperatures above 773 K, two yield strength hardening regions peaked at 873 K and 1073 K were observed. Microstructure analyses reveal an enhanced L1 2 ordering with the increase of compression temperatures and the subsequent precipitation of B2 phase at 973 K. Meanwhile, transmission electron microscopy observations of the post-deformation microstructures show that plastic deformation is primarily carried by dislocation at room temperature, and changes to twinning at temperatures higher than 873 K. At deformation temperatures higher than 1073 K, a mixed microstructure of dislocations and deformation twins is observed. These results suggest that the emerging of the yield strength peaks at high temperatures is related to the precipitation of the L1 2 and B2 intermetallic phases and high-temperature deformation influences the phase separation and phase selection of the HEA.

Original languageEnglish
Article number100243
JournalMaterialia
Volume5
DOIs
Publication statusPublished - 2019 Mar 1
Externally publishedYes

Fingerprint

Entropy
Yield stress
Temperature
Microstructure
Twinning
Dislocations (crystals)
Phase separation
Intermetallics
Hardening
Plastic deformation
Compaction
Transmission electron microscopy

Keywords

  • Deformation induced precipitation
  • High temperature deformation
  • High-entropy alloy
  • Intermetallic precipitates
  • Precipitation strengthening

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Temperature-dependent compression behavior of an Al 0.5 CoCrCuFeNi high-entropy alloy . / Xu, X. D.; Chen, S. Y.; Ren, Y.; Hirata, Akihiko; Fujita, T.; Liaw, P. K.; Chen, M. W.

In: Materialia, Vol. 5, 100243, 01.03.2019.

Research output: Contribution to journalArticle

Xu, X. D. ; Chen, S. Y. ; Ren, Y. ; Hirata, Akihiko ; Fujita, T. ; Liaw, P. K. ; Chen, M. W. / Temperature-dependent compression behavior of an Al 0.5 CoCrCuFeNi high-entropy alloy In: Materialia. 2019 ; Vol. 5.
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AU - Fujita, T.

AU - Liaw, P. K.

AU - Chen, M. W.

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