Hetero-deformation promoted strengthening and toughening in BCC rich eutectic and near eutectic high entropy alloys

D. H. Chung, J. Lee, Q. F. He, Y. K. Kim, K. R. Lim, H. S. Kim, Y. Yang, Y. S. Na

Research output: Contribution to journalArticlepeer-review


Heterostructured eutectic high-entropy alloys (EHEAs) have attracted significant attention owing to their novel properties, such as balanced combinations of strength and fracture toughness. However, the toughening/strengthening mechanisms of these EHEAs have not been thoroughly investigated. In this study, we developed a series of dual-phase Al(18–2x)Co30Cr(11+x)Fe(11+x)Ni30 (x= -1, 0, 1) eutectic and near-eutectic HEAs containing face-centered cubic (FCC) and body-centered cubic (BCC) phases. Despite the high amount of BCC, which is referred to as the brittle phase, newly developed EHEAs exhibited superior fracture toughness. Interestingly, we discovered that a fully eutectic HEA exhibited further improvements in both yield stress and fracture toughness, outperforming our off-eutectic and other previously reported HEAs. By combining experiments and theoretical models, we demonstrated that the synergistic increase in both strength and toughness in our fully eutectic HEA was derived from the high hetero-deformation-induced (HDI) strengthening/toughening associated with a high misorientation angle at the grain/phase boundaries.

Original languageEnglish
Pages (from-to)1-9
Number of pages9
JournalJournal of Materials Science and Technology
Publication statusPublished - 2023 May 20
Externally publishedYes


  • Eutectic high entropy alloy
  • Fracture toughness
  • Hetero deformation induced strengthening
  • Heterogeneous structure
  • Misorientation angle

ASJC Scopus subject areas

  • Ceramics and Composites
  • Mechanics of Materials
  • Mechanical Engineering
  • Polymers and Plastics
  • Metals and Alloys
  • Materials Chemistry


Dive into the research topics of 'Hetero-deformation promoted strengthening and toughening in BCC rich eutectic and near eutectic high entropy alloys'. Together they form a unique fingerprint.

Cite this