Fe-based high-entropy alloy with excellent mechanical properties enabled by nanosized precipitates and heterogeneous grain distribution

Heechan Jung, Sangwon Lee, Taehyeok Kang, Alireza Zargaran, Pyuck Pa Choi, Seok Su Sohn

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

High-entropy alloys (HEAs) consisting of CoCrFeNiAlTi systems, with a face-centered cubic (FCC) matrix reinforced by ordered L12 precipitates, have demonstrated exceptional strength-ductility combinations. However, the current compositional design of HEAs heavily relies on high Ni and Co contents, compromising the balance between properties and cost. Thus, it is crucial to optimize the cost-performance trade-off by fine-tuning the range of Fe, Co, and Ni, while maintaining excellent strength-ductility combination. In this study, we propose a novel Fe-based HEA with nanosized precipitates and a heterogeneous grain distribution, achieving a strength-ductility combination comparable to state-of-the-art Ni- or Co-based HEAs. The alloy benefits from both precipitation hardening and hetero-deformation-induced strengthening attributed to the heterogeneous grain distribution, resulting in excellent yield strength of 1433 MPa, tensile strength of 1599 MPa, and ductility of 22%. The microstructural evolution and its influence on mechanical properties are unraveled with respect to the observation of precipitate-dislocation interaction and hetero-deformation-induced stress (HDI stress) evaluation. This study suggests that the challenge of balancing properties and cost can be addressed through optimized compositional and microstructural design.

Original languageEnglish
Pages (from-to)71-81
Number of pages11
JournalJournal of Materials Science and Technology
Volume181
DOIs
Publication statusPublished - 2024 May 10

Bibliographical note

Publisher Copyright:
© 2023

Keywords

  • HDI stress
  • Heterogeneous microstructure
  • High-entropy alloys
  • Mechanical property
  • Precipitation

ASJC Scopus subject areas

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

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