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Powder metallurgy of Al0.1CoCrFeNi high-entropy alloy

Published online by Cambridge University Press:  05 October 2020

Rathinavelu Sokkalingam ,
Marek Tarraste ,
Kumar Babu Surreddi ,
Valdek Mikli ,
Veerappan Muthupandi ,
Katakam Sivaprasad  and
Konda Gokuldoss Prashanth
Rathinavelu Sokkalingam
Affiliation:
Advanced Materials Processing Laboratory, Department of Metallurgical and Materials Engineering, National Institute of Technology, Tiruchirappalli620015, Tamil Nadu, India
Marek Tarraste
Affiliation:
Department of Mechanical and Industrial Engineering, Tallinn University of Technology, 19086 Tallinn, Estonia
Kumar Babu Surreddi
Affiliation:
Materials Technology, Dalarna University, SE-791 88Falun, Sweden
Valdek Mikli
Affiliation:
Department of Materials and Environmental Technology, Tallinn University of Technology, 19086 Tallinn, Estonia
Veerappan Muthupandi
Affiliation:
Advanced Materials Processing Laboratory, Department of Metallurgical and Materials Engineering, National Institute of Technology, Tiruchirappalli620015, Tamil Nadu, India
Katakam Sivaprasad*
Affiliation:
Advanced Materials Processing Laboratory, Department of Metallurgical and Materials Engineering, National Institute of Technology, Tiruchirappalli620015, Tamil Nadu, India
Konda Gokuldoss Prashanth*
Affiliation:
Department of Mechanical and Industrial Engineering, Tallinn University of Technology, 19086 Tallinn, Estonia Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, LeobenA-8700, Austria CBCMT, School of Mechanical Engineering, Vellore Institute of Technology, Vellore632014, India
*
a)Address all correspondence to these authors. e-mail: ksp@nitt.edu
b)e-mail: kgprashanth@gmail.com
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Abstract

Al0.1CoCrFeNi high-entropy alloy (HEA) was synthesized successfully from elemental powders by mechanical alloying (MA) and subsequent consolidation by spark plasma sintering (SPS). The alloying behavior, microstructure, and mechanical properties of the HEA were assessed using X-ray diffraction, electron microscope, hardness, and compression tests. MA of the elemental powders for 8 h has resulted in a two-phased microstructure: α-fcc and β-bcc phases. On the other hand, the consolidated bulk Al0.1CoCrFeNi-HEA sample reveals the presence of α-fcc and Cr23C6 phases. The metastable β-bcc transforms into a stable α-fcc during the SPS process due to the supply of thermal energy. The hardness of the consolidated bulk HEA samples is found to be 370 ± 50 HV0.5, and the yield and ultimate compressive strengths are found to be 1420 and 1600 MPa, respectively. Such high strength in the Al0.1CoCrFeNi HEA is attributed to the grain refinement strengthening.

Keywords

Al0.1CoCrFeNi high-entropy alloymechanical alloyingspark plasma sinteringmechanical properties
Type
Invited Feature Paper
Information
Journal of Materials Research , Volume 35 , Issue 21 , 16 November 2020 , pp. 2835 - 2847
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Copyright
Copyright © The Author(s), 2020. Published by Cambridge University Press on behalf of Materials Research Society

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