High-entropy alloys by mechanical alloying: A review

Mechanical alloying (MA) followed by sintering has been one of the most widely adopted routes to produce nanocrystalline high-entropy alloys (HEAs). Enhanced solid solubility, room temperature processing, and homogenous alloy formation are the key benefits provided by MA. Spark plasma sintering has...

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Bibliographic Details
Published in:Journal of materials research Vol. 34; no. 5; pp. 664 - 686
Main Authors: Vaidya, Mayur, Muralikrishna, Garlapati Mohan, Murty, Budaraju Srinivasa
Format: Journal Article
Language:English
Published: New York, USA Cambridge University Press 14.03.2019
Springer International Publishing
Springer Nature B.V
Subjects:
Alloys
Applied and Technical Physics
Biomaterials
Densification
Entropy
High entropy alloys
Inorganic Chemistry
Materials Engineering
Materials research
Materials Science
Mechanical alloying
Mechanical properties
Nanotechnology
Oxidation
Plasma sintering
Plastic deformation
Process controls
REVIEW
Solid solubility
Solid solutions
Spark plasma sintering
Stainless steel
Thermal stability
sintering
mechanical alloying
nanostructure
ISSN:0884-2914, 2044-5326
Online Access:Get full text
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Summary:Mechanical alloying (MA) followed by sintering has been one of the most widely adopted routes to produce nanocrystalline high-entropy alloys (HEAs). Enhanced solid solubility, room temperature processing, and homogenous alloy formation are the key benefits provided by MA. Spark plasma sintering has largely been used to obtain high-density HEA pellets from milled powders. However, there are many challenges associated with the production of HEAs using MA, which include contamination during milling and high propensity of oxidation. The present review provides a comprehensive understanding of various HEAs produced by MA so far, with the aim to bring out the governing aspects of phase evolution, thermal stability, and properties achieved. The limitations and challenges of the process are also critically assessed with a possible way forward. The paper also compares the results obtained from high-pressure torsion, another severe plastic deformation technique.
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ISSN:0884-2914
2044-5326
DOI:10.1557/jmr.2019.37