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High-entropy alloys by mechanical alloying: A review

Published online by Cambridge University Press:  14 March 2019

Mayur Vaidya ,
Garlapati Mohan Muralikrishna  and
Budaraju Srinivasa Murty Open the ORCID record for Budaraju Srinivasa Murty [Opens in a new window]
Mayur Vaidya
Affiliation:
Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai 600036, India
Garlapati Mohan Muralikrishna
Affiliation:
Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai 600036, India
Budaraju Srinivasa Murty*
Affiliation:
Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai 600036, India
*
a)Address all correspondence to this author. e-mail: murty@iitm.ac.in
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Abstract

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.

Keywords

mechanical alloyingnanostructuresintering

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Type
REVIEW
Information
Journal of Materials Research , Volume 34 , Issue 5: Focus Issue: Nanocrystalline High Entropy Materials: Processing Challenges and Properties , 14 March 2019 , pp. 664 - 686
Copyright
Copyright © Materials Research Society 2019 

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Footnotes

This section of Journal of Materials Research is reserved for papers that are reviews of literature in a given area.

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