In-situ alloyed, oxide-dispersion-strengthened CoCrFeMnNi high entropy alloy fabricated via laser powder bed fusion

Peng Chen, Chao Yang, Sheng Li, Moataz M. Attallah, Ming Yan

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)
111 Downloads (Pure)

Abstract

By using a blend of pre-alloyed CoCrFeNi powder and elemental Mn powder, quasi-equiatomic CoCrFeMnNi high entropy alloy (HEA) has been in-situ alloyed via laser powder bed fusion (LPBF). Besides being homogeneously dissolved into the HEA matrix, Mn also forms oxide particles with oxygen originating from both powder feedstock and printing atmosphere, resulting in an in-situ alloyed, oxide-dispersion-strengthened (ODS) HEA. The tensile strength of the ODS HEA is significantly improved to a yield strength of 620 MPa and a tensile strength of 730 MPa. The tensile ductility of the ODS HEA is lower than the ones prepared by using fully pre-alloyed powders, but an outstanding compression ductility maintains for the ODS HEA. The deforming behaviour of the alloy has been revealed, and the contribution of Orowan strengthening has been quantified along with other mechanisms. The study provides an approach to developing advanced HEAs with high strength and moderate ductility by LPBF.

Original languageEnglish
Article number108966
JournalMaterials and Design
Volume194
Early online date11 Jul 2020
DOIs
Publication statusPublished - Sep 2020

Keywords

  • Additive manufacturing
  • Deformation behaviour
  • High entropy alloys
  • Orowan strengthening
  • Powder bed fusion

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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