Effect of Al Addition on the Microstructural Evolution of Equiatomic CoCrFeMnNi Alloy

Journal article


Kumar, J., Kumar, N., Das, S., Gurao, N. and Biswas, K. (2018). Effect of Al Addition on the Microstructural Evolution of Equiatomic CoCrFeMnNi Alloy. Transactions of the Indian Institute of Metals. 71 (11), pp. 2749-2758. https://doi.org/10.1007/s12666-018-1443-4
AuthorsKumar, J., Kumar, N., Das, S., Gurao, N. and Biswas, K.
Abstract

The present investigation reports the effect of Aluminium-addition on the microstructural evolution in the equiatomic CoCrFeMnNi high entropy alloy. Aluminium was added to the
alloy in varying quantity using the vacuum arc melting technique, and phase formation have been probed using X-ray diffraction, scanning electron microscopy and
transmission electron microscopy. The results indicate that the FCC phase in the alloy remains unaltered up to Al of 5 at.%. The higher amount of Al addition leads to the
precipitation of B2 Al(Ni, Cr) in the FCC matrix. For Al  7%, typical phase separated microstructure consisting of FCC, and B2 phases have been observed. The microstructural
changes lead to hardness variation from 1.3 to 2.2 GPa, mainly due to precipitation and solute solution hardening of FCC phase. For FCC phase, Al atoms being smaller in size can cause and lead to lattice distortion and improve yield strength. The results have been explained by detailed thermodynamical analysis using HEA3 database.

KeywordsHigh entropy alloy; Cantor alloy; Microstructure; TEM
Year2018
JournalTransactions of the Indian Institute of Metals
Journal citation71 (11), pp. 2749-2758
PublisherSpringer Science and Business Media LLC
ISSN0972-2815
Digital Object Identifier (DOI)https://doi.org/10.1007/s12666-018-1443-4
Publication dates
PrintNov 2018
Online23 Oct 2018
Publication process dates
Accepted12 Sep 2018
Deposited30 Jan 2021
Accepted author manuscript
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Open
Additional information

This is a post-peer-review, pre-copyedit version of an article published in Transactions of the Indian Institute of Metals. The final authenticated version is available online at: http://dx.doi.org/10.1007/s12666-018-1443-4

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