A novel high-entropy alloy with multi-strengthening mechanisms: Activation of TRIP effect in C-doped high-entropy alloy

Hyeon Seok Do, Tae Jin Jang, Ki Jeong Kim, Seok Su Sohn, Byeong Joo Lee

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

Efforts have been made to intentionally activate multiple strengthening mechanisms in a single alloy because individual strengthening effects have not been sufficiently exhibited in previous alloys with multi-strengthening mechanisms. Here, we design a novel high-entropy alloy with multi-strengthening mechanisms through a stepwise design approach utilizing CALPHAD type thermodynamic calculation. The target strengthening mechanisms are introduced step by step, from solid solution strengthening, the addition of precipitation hardening and transformation-induced plasticity, based on the calculation. The finally designed Co21Cr11Fe49Mn4Ni4V2C1Mo3Si5 alloy simultaneously benefits from solid solution strengthening due to Mo and V addition, precipitation hardening from nanoscale precipitates, grain boundary strengthening by grain refinement, and transformation-induced plasticity by BCC deformation-induced martensite transformation. Individual strengthening effects is sufficiently exhibited in the designed alloy, which leads to an excellent combination of yield strength (732 MPa), ultimate tensile strength (1100 MPa), and ductility (47.5%).

Original languageEnglish
Article number144220
JournalMaterials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
Volume859
DOIs
Publication statusPublished - 2022 Nov 24

Bibliographical note

Funding Information:
This research was supported by the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT of Korea ( 2016M3D1A1023383 and NRF-2022R1A5A1030054 ).

Publisher Copyright:
© 2022 Elsevier B.V.

Keywords

  • CALPHAD
  • Computational design
  • High-entropy alloys
  • Multi-strengthening mechanisms

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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