Influence of processing route on the alloying behavior, microstructural evolution and thermal stability of CrMoNbTiW refractory high-entropy alloy

Two different processing routes of mechanical alloying followed by the spark plasma sintering (powder metallurgy) and vacuum arc melting (casting route) were employed to understand the role of processing routes on the phase and microstructural evolution in an equiatomic CrMoNbTiW refractory high-ent...

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Bibliographic Details
Published in:Journal of materials research 2020-06, Vol.35 (12), p.1556-1571
Main Authors: Raman, Lavanya, Karthick, G., Guruvidyathri, K., Fabijanic, Daniel, Narayana Murty, S. V. S., Murty, B. S., Kottada, Ravi S.
Format: Article
Language:English
Subjects:
Alloy powders
Alloys
Applied and Technical Physics
Biomaterials
Carbon
Computer simulation
Contaminants
Electric arc melting
Entropy
Evolution
Heat treatment
High entropy alloys
Homology
Inorganic Chemistry
Materials Engineering
Materials research
Materials Science
Mechanical alloying
Microstructure
Morphology
Nanotechnology
Novel Synthesis and Processing of Metals
Organic and Hybrid Functional Materials
Phase diagrams
Plasma sintering
Powder metallurgy
Process controls
Sigma phase
Solid solutions
Spark plasma sintering
Temperature
Thermal stability
Vacuum arc melting
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Summary:Two different processing routes of mechanical alloying followed by the spark plasma sintering (powder metallurgy) and vacuum arc melting (casting route) were employed to understand the role of processing routes on the phase and microstructural evolution in an equiatomic CrMoNbTiW refractory high-entropy alloy. Besides a major BCC solid solution, a small fraction of carbide, σ phase, nitride, and oxide phases were observed in the alloys prepared by the powder metallurgy route in contrast to a single-phase BCC solid solution in the casting route. The milling atmosphere (dry milling in air and Ar) has significantly influenced the phase and microstructural evolution, illustrating the substantial role of contaminants. Good thermal stability of microstructure at high homologous temperatures was shown based on the long-term heat treatment at 1300 °C for 240 h. The phase evolution predictions via Calphad studies were found to be in reasonable agreement with the experimental observations, albeit with some limitations.
ISSN:0884-2914
2044-5326
DOI:10.1557/jmr.2020.128