Comparative study on sintering kinetics of as-milled and annealed CoCrFeNi high entropy alloy powders

Mane, Rahul B and Panigrahi, Bharat Bhooshan (2018) Comparative study on sintering kinetics of as-milled and annealed CoCrFeNi high entropy alloy powders. Materials Chemistry and Physics, 210. pp. 49-56. ISSN 0254-0584

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Abstract

This work attempts to understand the effect of initial conditions, i.e., as-milled powder and phase stabilized nearly single phase powder (through annealing), on sintering kinetics of CoCrFeNi high entropy alloy powders. Dilatometric study indicates, axial shrinkage reduced from about 5% to 3% when powder was annealed. Analysis of shrinkage through non-isothermal method shows activation energies of sintering increased significantly for a given model, in annealed powder compared to as-milled powder. Calculated activation energies indicate, in as-milled powder grain boundary diffusion seems to be the dominating mechanism, attributed to the presence of ultrafine grains and a large fraction of grain boundaries. On the other hand, annealing helped to form almost single phase HEA, decrease in defect concentration and reduced grain boundary fraction with increased crystallites; which led to increase in activation energies. Coefficients of thermal expansion have also been studied and it was found to vary with temperature range.

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IITH Creators:
IITH CreatorsORCiD
Panigrahi, Bharat BhooshanUNSPECIFIED
Item Type: Article
Uncontrolled Keywords: High entropy alloys, Dilatometer, Sintering, Diffusion
Subjects: Materials Engineering > Materials engineering
Divisions: Department of Material Science Engineering
Depositing User: Team Library
Date Deposited: 26 Apr 2018 03:27
Last Modified: 26 Apr 2018 03:27
URI: http://raiith.iith.ac.in/id/eprint/3887
Publisher URL: http://doi.org/10.1016/j.matchemphys.2017.11.047
OA policy: http://www.sherpa.ac.uk/romeo/issn/0254-0584/
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