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Transactions of the Indian Institute of Metals

, Volume 72, Issue 1, pp 111–121 | Cite as

Microstructural Characterization of Equiatomic CrFeNbNiV Alloy

  • A. Saikumaran
  • R. MythiliEmail author
  • S. Saroja
  • V. Srihari
Technical Paper
  • 34 Downloads

Abstract

This paper presents the results of an experimental study to investigate the structural and microchemical characteristics of an equiatomic CrFeNbNiV alloy. XRD analysis of CrFeNbNiV alloy, revealed a predominant NbCrNi type HCP Laves phase conjoined with two minor tetragonal and BCC phases. Detailed microstructural investigations using electron microscopy techniques also substantiated the presence of the above mentioned phases. The structure of Laves phase in this alloy is determined ab initio for the first time using Precession Electron Diffraction technique which was in agreement with the Rietveld analysis of XRD pattern. The formation of intermetallic Laves phase was understood based on theoretical phase stability and average d- orbital energy level \(\overline{\text{Md}}\) value calculations. The alloy in the ‘as cast’ condition exhibited a very high value of hardness (~ 1500 Hv). No change in the microstructure and hardness was observed on annealing at high temperatures even up to 1373 K (1100 °C).

Keywords

High entropy alloy Precession electron diffraction Automated diffraction tomography Microstructure Laves phase Phase stability 

Notes

Acknowledgements

Authors would like to thank Dr. G. Amarendra, Director, Metallurgy and Materials Group, and Dr. A. K. Bhaduri, Director, Indira Gandhi Centre for Atomic Research for their sustained support and encouragement in the pursuit of this work. Mr. Saikumaran expresses his deep sense of gratitude to HBNI for funding this project. The authors also thank UGC-DAE consortium for SEM facilities, Dr. N. V. Chandrasekar and Mr. Meenakshi sundaram for their help in alloy melting, Dr. S. Kalavathy and Mr. Irshad. K. Abbas for the XRD experiments.

Compliance with Ethical Standards

Data Availability

The raw/processed data required to reproduce these findings cannot be shared at this time as the data also forms part of an ongoing study.

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Copyright information

© The Indian Institute of Metals - IIM 2018

Authors and Affiliations

  1. 1.Indira Gandhi Centre for Atomic ResearchHomi Bhabha National InstituteKalpakkamIndia
  2. 2.Materials Characterization Group, Metallurgy and Materials GroupIGCARKalpakkamIndia
  3. 3.IGCARHBNIKalpakkamIndia
  4. 4.High Pressure & Synchrotron Radiation Physics DivisionBhabha Atomic Research CentreMumbaiIndia

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