研究目的
Investigating the effects of annealing on the microstructures and mechanical properties of the SLMed FeCoCrNiC0.05 high entropy alloy.
研究成果
Nano-scaled Cr23C6-type carbide can precipitate in the SLMed FeCoCrNiC0.05 being annealed at 1073 K, leading to higher yielding strength. The precipitation behavior can be successfully predicted by the modified Avarmi formula. The strengthening effect can be quantitatively calculated by considering solid solution hardening, precipitation hardening and cell structure hardening.
研究不足
The study focuses on the precipitation behavior and mechanical properties of SLMed FeCoCrNiC0.05 under specific annealing conditions. The generalizability to other HEAs or processing conditions may require further investigation.
1：Experimental Design and Method Selection:
FeCoCrNiC
2：05 HEA was fabricated by SLM and then annealed at various conditions to study precipitation behavior and strengthening mechanisms. Sample Selection and Data Sources:
Pre-alloyed powder with a mean particle size of about 45 μm was used.
3：List of Experimental Equipment and Materials:
SLM machine (FS271M, Farsoon, China), XRD, TEM (FEI Tecnai G2 F20), SEM (FEI Quanta 650), EPMA (JXA-8530F, Japan), Instron 3369 machine, Vickers hardness tester, and nanoindenter.
4：Experimental Procedures and Operational Workflow:
Samples were annealed at 1073 K for
5：5–14 h followed by cooling in air. Microstructural characterization and mechanical tests were conducted. Data Analysis Methods:
Precipitation kinetics was described using Avrami formula. Strengthening mechanisms were analyzed based on microstructure-related equations.
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Scanning electron microscope
FEI Quanta 650
FEI
Characterization of microstructures equipped with an electron backscattered diffraction (EBSD) analyzer.
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Transmission electron microscopy
FEI Tecnai G2 F20
FEI
Characterization of microstructures.
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SLM machine
FS271M
Farsoon
Fabrication of standard-sized tensile specimens from alloy powder.
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X-ray diffractometer
Not provided
Not provided
Examination of phase constitutions in SLMed FeCoCrNiC0.05 annealed at 1073 K for various time.
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Electron Probe Micro Analysis
JXA-8530F
Japan
Composition analysis.
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Instron machine
3369
Instron
Conducting tensile tests.
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Vickers hardness tester
Not provided
Not provided
Conducting hardness and microhardness tests.
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Nanoindenter
UNHTL + MCT
Switzerland
Conducting nanoindentation tests.
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