A super strong high entropy alloy with discontinuous precipitation and fine grains by additive manufacturing and thermomechanical treatment

Y. L. Wang, K. C. Chan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

5 Citations (Scopus)

Abstract

Despite previous work on achieving strength and ductility synergy of face-centered-cubic (FCC) high entropy alloys (HEAs) by additive manufacturing and thermomechanical treatment, it still relied on grain refinement, limiting the improvement of the mechanical properties of the HEAs. In the present work, as a common thermomechanical processing technique, cold rolling was applied to additively manufactured (AMed) HEA to further attain fine grain and discontinuous precipitation (DP)-containing microstructures. The perpendicular relationship between the rolling direction and the inherent dislocation walls in AM enabled maximum deformation energy storage during rolling, thereby promoting recrystallization and concurrent DP nucleation. The combined effects of high grain boundary mobility and elemental micro-segregation facilitated the discontinuous L12 precipitated microstructure. The resulting specimen exhibited an excellent yield strength of 1430 MPa and a tensile strength of 1800 MPa with 16% ductility. This combined approach provides a new means to tailor the heterogeneous characteristics of both coherent precipitates and grains, which is traditionally not available using AM method alone.

Original languageEnglish
Article number145164
Number of pages9
JournalMaterials Science and Engineering A
Volume876
DOIs
Publication statusPublished - 15 Jun 2023

Keywords

  • Additive manufacturing
  • Discontinuous precipitation
  • High entropy alloy
  • Mechanical properties
  • Thermomechanical treatment

ASJC Scopus subject areas

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

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