Microstructural and Micromechanical Properties of Cold Sprayed High Entropy Cantor Alloy Coatings

Wednesday, May 24, 2023: 3:50 PM
301B (Quebec City Convention Centre)
Ms. Maya Marie Harfouche , McGill University, Montreal, QC, Canada
Dr. Sima Alidokht , McGill University, Montreal, QC, Canada, Memorial University, St John's, NF, Canada
Dr. Roghayeh Nikbakht , University of Ottawa, Ottawa, ON, Canada, McGill University, Montreal, QC, Canada
Prof. Richard R. Chromik , McGill University, Montreal, QC, Canada
CrMnCoFeNi High Entropy Alloy (i.e. Cantor alloy) powder was cold sprayed (CS) using nitrogen process gas at varying spray parameters. A thick and dense coating was successfully obtained on a mild steel substrate with a process gas temperature and pressure of 950°C and 4.9 MPa. X-ray diffraction analysis of the coating showed that the single-phase FCC structure of the CrMnCoFeNi feedstock powder was retained after cold spraying. The microstructure of the coating was analyzed using scanning electron microscopy. Significant deformation of the powder particles was observed, as well as grain refined regions at the splat interfaces. Multi-scale indentations were performed to investigate the micro- and nanomechanical properties of the coating. The overall hardness of the coating was higher than that of the feedstock powder, and enhanced hardening was observed at the splat interfaces. The presence of linear elements in the microstructure, observed using electron channeling contrast imaging and electron backscatter diffraction, indicated that mechanical twinning is a deformation mechanism occurring during CS of this HEA powder. Laser assisted cold spray (LACS) was also used to deposit the Cantor alloy powder with similar process gas parameters. The properties of the CS and LACS coatings were compared.
See more of: Cold Sprayed or Aerosol Deposition- Metals, Polymers, Ceramics, and Metal Matrix Composite Coatings III
See more of: Fundamentals/Research & Development