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Sintering mechanisms of mechanically alloyed CoCrFeNi high-entropy alloy powders

Published online by Cambridge University Press:  17 July 2018

Rahul B. Mane  and
Bharat B. Panigrahi
Rahul B. Mane
Affiliation:
Department of Materials Science and Metallurgical Engineering, Indian Institute of Technology Hyderabad, Sangareddy, Telangana 502285, India
Bharat B. Panigrahi*
Affiliation:
Department of Materials Science and Metallurgical Engineering, Indian Institute of Technology Hyderabad, Sangareddy, Telangana 502285, India
*
a)Address all correspondence to this author. e-mail: bharat@iith.ac.in
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Abstract

High-entropy alloys (HEAs) are receiving considerable attention since last decade because of their ability to give excellent strength with reasonably good elongation during fracture. The mechanical alloying followed by sintering is one of the routes for fabrication; however, there are limited reports on sintering mechanisms of HEA powders. The present investigation studies sintering mechanisms of CoCrFeNi alloy powders in as-milled and annealed conditions using dilatometer experiments. The annealed powder shows slower densification behavior and higher activation energy of sintering, compared to the as-milled powder. Diffusion coefficients were analyzed through sintering models and compared with literature data. The as-milled powder was found to exhibit mixed response, i.e., the grain boundary diffusion seems to be dominating initially due to a large grain boundary fraction but volume diffusion (VD) also contributes significantly, due to high defect concentration and metastable phases. VD was found to be the dominating mechanism during sintering of single phase, stable annealed powder.

Keywords

sinteringdiffusionmechanical alloying
Type
Article
Information
Journal of Materials Research , Volume 33 , Issue 19: Focus Issue: Fundamental Understanding and Applications of High-Entropy Alloys , 14 October 2018 , pp. 3321 - 3329
Copyright
Copyright © Materials Research Society 2018 

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