研究目的
Investigating the microstructure, phase compositions, microhardness, and texture of CeO2-doped CoCrFeMnNi high entropy alloy fabricated by laser metal deposition.
研究成果
The CrMnFeCoNi high entropy alloy composites with the addition of small amount of CeO2 were successfully prepared by LMD process under two levels of laser power. The microstructure, phase compositions, microhardness and crystallographic texture were studied. The addition of CeO2 causes formation of small irregular shape oxides rich in Mn and Cr. Hardness reduction with the increase of distance from substrate was observed.
研究不足
The study is limited to the investigation of microstructure, phase compositions, microhardness, and texture of CeO2-doped CoCrFeMnNi high entropy alloy fabricated by LMD. The effects of other rare earth elements or different concentrations of CeO2 were not explored.
1：Experimental Design and Method Selection:
The study involved the fabrication of CoCrFeMnNi high entropy alloy (HEA) doped with CeO2 using the laser metal deposition (LMD) process. The microstructure, phase compositions, microhardness, and crystallographic texture were investigated.
2：Sample Selection and Data Sources:
Pre-alloyed spherically shaped particles of CoCrFeMnNi and rare-earth oxide (CeO2) particles were used. The powders were mixed by ball milling before the AM process.
3：List of Experimental Equipment and Materials:
A 2000 W Laserline ?ber laser system with 2 mm laser spot diameter was used for LMD. Scanning electron microscope (SEM), energy-dispersive spectroscopy (EDS), and electron backscatter diffraction (EBSD) were used for analysis.
4：Experimental Procedures and Operational Workflow:
The powder mixture was delivered into the laser molten pool through a coaxial conical focused powder feed nozzle. Argon was used as the shielding gas. Wall samples were fabricated under two laser powers, 1600 W and 2000 W.
5：Data Analysis Methods:
Microstructure and composition analysis were performed using SEM, EDS, and EBSD. Microhardness measurements were performed using a Vickers hardness tester.
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