Microstructural evolution and grain-growth kinetics of Al0.2CoCrFeNi high-entropy alloy

Dudala, Srinivas and Krishna S, Chenna and Korla, Rajesh (2021) Microstructural evolution and grain-growth kinetics of Al0.2CoCrFeNi high-entropy alloy. Philosophical Magazine Letters, 101 (11). pp. 444-454. ISSN 0950-0839

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Abstract

Grain-growth kinetics of high-entropy, single-phase, face-centred cubic (FCC) Al0.2CoCrFeNi alloy was studied by isothermal annealing over a wide temperature range for different time intervals. Both optical and EBSD studies show a significant amount of annealing twins. Data were analysed using classical grain-growth models and the activation energy was estimated using the Arrhenius type equation. The grain-growth exponent was found to be n = 3 and the measured activation energy for grain growth was 190 ± 15 kJ mol−1. Significant resistance to grain growth was observed at 1100°C. Microstructural characterisation tools like EBSD, along with nanoindentation, was used to understand the observed behaviour. © 2021 Informa UK Limited, trading as Taylor & Francis Group.

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IITH Creators:

IITH Creators	ORCiD
Korla, Rajesh	UNSPECIFIED

Item Type:

Article

Additional Information:

The authors would like to acknowledge the financial support of DST-FIST programme (Grant no. SR/FST/ETI-421/ 2016) and JICA for funding instrumentation (FESEM-EBSD and Nano-indentation) facilities and Mr. Sairam Goud Kotla for the help in performing nanoindentation experiments. The authors would also like to thank the financial support of MHRD and SERB (grant number ECR/2017/001278).

Uncontrolled Keywords:

Annealing twins; Grain growth; High-entropy alloy; Nanoindentation

Subjects:

Materials Engineering > Materials engineering

Divisions:

Department of Material Science Engineering

Depositing User:

. LibTrainee 2021

Date Deposited:

06 Sep 2022 07:20

Last Modified:

06 Sep 2022 07:21