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

Full text not available from this repository. (Request a copy)


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.

[error in script]
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
Publisher URL:
OA policy:
Related URLs:

Actions (login required)

View Item View Item
Statistics for RAIITH ePrint 3887 Statistics for this ePrint Item