Microstructure and Mechanical Characteristics of AlCoCrFeNi-Based ODS High-Entropy Alloys Consolidated by Vacuum Hot Pressing

The study investigates that a high-entropy alloy based on AlCoCrFeNi is mechanically alloyed (MA) for 40 h with 1 wt% Y 2 O 3 dispersed and then consolidated through vacuum hot pressing (VHP). In VHP, three temperatures are used for consolidation: 800 °C, 900 °C, and 1000 °C. Microanalysis of the po...

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Bibliographic Details
Published in:Metals and materials international 2024, 30(3), , pp.726-734
Main Authors: Rao, K. Raja, Dewangan, Sheetal Kumar, Seikh, A. H., Sinha, Sudip Kumar, Ahn, Byungmin
Format: Article
Language:English
Subjects:
Body centered cubic lattice
Characterization and Evaluation of Materials
Chemistry and Materials Science
Consolidation
Dispersion hardening alloys
Engineering Thermodynamics
Enthalpy
Face centered cubic lattice
Garnets
Grain size distribution
Heat and Mass Transfer
Heating
High entropy alloys
Hot pressing
Intermetallic phases
Machines
Magnetic Materials
Magnetism
Manufacturing
Materials Science
Mechanical alloying
Mechanical properties
Metallic Materials
Microstructure
Plasma sintering
Processes
Sintering (powder metallurgy)
Solid Mechanics
Spark plasma sintering
Yttrium
Yttrium oxide
재료공학
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Summary:The study investigates that a high-entropy alloy based on AlCoCrFeNi is mechanically alloyed (MA) for 40 h with 1 wt% Y 2 O 3 dispersed and then consolidated through vacuum hot pressing (VHP). In VHP, three temperatures are used for consolidation: 800 °C, 900 °C, and 1000 °C. Microanalysis of the powder aggregate formed by MA revealed the presence of mostly face-centered cubic (FCC) and body-centered cubic (BCC) phases, along with a metastable AlFe 4 O 12 Y 3 garnet phase. The enthalpy of mixing Y and Al induced the development of the garnet phase. In addition, after the consolidation of the powder sample at different temperatures, microstructural investigations indicated that the FCC and BCC phases generated during MA were stable owing to sluggish diffusion. By contrast, the garnet phase generated during the MA dissociated into an intermetallic phase based on Yttrium. The slower heating rates associated with VHP (in comparison to the rapid heating rates associated with spark plasma sintering) may be responsible for the dissociation of the garnet phase. The sample sintered at 1000 °C exhibited a bimodal grain distribution, with grain sizes ranging from 100 to 800 nm, as determined by transmission electron microscopy. In addition, this sample had the highest measured hardness of 1353 ± 20 Hv. Graphical Abstract
ISSN:1598-9623
2005-4149
DOI:10.1007/s12540-023-01530-7