Preliminary assessment of the irradiation behaviour of the FeCrMnNi High-Entropy Alloy for nuclear applications

Philip D. Edmondson, Matheus Araujo Tunes, Robert Harrison, Graeme Greaves, Jonathan Hinks, Stephen Donnelly

Research output: Chapter in Book/Report/Conference proceedingChapter


In the search for new nuclear materials with improved radiation tolerance and behavior, the high-entropy alloys (HEAs) have arisen as new candidates for structural components in nuclear reactors due to their suspected superior stability under irradiation. The metallurgical definition of HEAs is any alloy with multiple elements, five or more all in equiatomic compositions. The basic principle is the high mixing entropy of its solid solution lowers the Gibbs free energy giving a strong enhancement of the microstructural stability at low and high temperatures.

The objective of this project is to assess the irradiation behaviour of the FeCrMnNi HEA system in order to investigate whether the high entropy effect is responsible for a microstructure with better radiation resistance compared to conventional alloys. In this work transmission electron microscopy (TEM) with in-situ ion irradiation has been used at the MIAMI-1 facility at the University of Huddersfield, UK: a 100 kV ion accelerator coupled with a JEOL JEM-2000FX TEM. This methodology allows the evolution of the HEA microstructure to be studied on the nanoscale during the ion irradiation.
Original languageEnglish
Title of host publicationFusion Materials Research at Oak Ridge National Laboratory in Fiscal Year 2016
EditorsF. W. Wiffen, Y. Katoh, S. Melton
Place of PublicationOak Ridge, Tennessee
PublisherUS Department of Energy
Number of pages4
Publication statusPublished - Nov 2016


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