Studies on Kinetics of BCC to FCC Phase Transformation in AlCoCrFeNi Equiatomic High Entropy Alloy

Panda, J. P. and Arya, P. and Guruvidyathri, K. and Ravikirana, . and Murty, B S (2021) Studies on Kinetics of BCC to FCC Phase Transformation in AlCoCrFeNi Equiatomic High Entropy Alloy. Metallurgical and Materials Transactions A, 52 (5). pp. 1679-1688. ISSN 1073-5623

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Abstract

Kinetics of face-centered cubic (FCC) phase evolution in equiatomic AlCoCrFeNi alloy has been studied in this work, measuring the phase fraction from X-ray diffraction (XRD). As-cast alloy showed a body-centered cubic (BCC)+B2 structure. Heat treatments performed at different temperatures showed the formation up-to 30 to 35 pct FCC phase between 1073 K and 1373 K. A systematic decrease in hardness from 540 to 390 HV10 with increase in temperature suggested an increase in the FCC volume fraction. Kinetics of FCC evolution were analyzed using the Johnson–Mehl–Avrami–Kolmogorov equation and Arrhenius law to calculate the activation energy for the phase transformation. Furthermore, a time-temperature-transformation diagram was constructed from the isothermal transformation studies. Detailed microstructural investigation suggests faster kinetics of FCC phase formation near dendritic boundaries compared to interdendritic regions. The Kurdjumov–Sachs orientation relationship between FCC and BCC phases suggested a coherent interface between these phases. Results of the present study pave the way to decide on heat treatment practices in AlCoCrFeNi alloy. © 2021, The Minerals, Metals & Materials Society and ASM International.

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IITH Creators:

IITH Creators	ORCiD
Murty, B S	https://orcid.org/0000-0002-4399-8531

Item Type:

Article

Additional Information:

This work was supported by the Department of Science and Technology under sanction order ECR/2016/001327.

Uncontrolled Keywords:

Body-centered cubic; Face centered cubic phase; Interdendritic regions; Isothermal transformations; Kolmogorov equations; Microstructural investigation; Orientation relationship; Time temperature transformation diagrams

Subjects:

Others > Metallurgy
Materials Engineering > Materials engineering

Divisions:

Department of Material Science Engineering

Depositing User:

. LibTrainee 2021

Date Deposited:

01 Oct 2022 04:56

Last Modified:

01 Oct 2022 04:56

URI:

http://raiithold.iith.ac.in/id/eprint/10753