Elsevier

Materialia

Volume 26, December 2022, 101580
Materialia

Full Length Article
Temperature effect on radiation‐induced dislocation loops in a FCC high purity CrFeMnNi multi‐principal element alloy

https://doi.org/10.1016/j.mtla.2022.101580Get rights and content

Abstract

Temperature effect on dislocation loop density and radiation-induced segregation (RIS) phenomena are investigated on an ion irradiated 15Cr-46Fe-17Mn-22Ni (at.%) multi-principal element alloy (MPEA) over a wide range of temperatures. From 95 K to 623 K, loop densities are temperature independent and close to ∼5.0 × 1022 m-3. Above 623 K, loop densities decrease until ∼1.05 × 1021 m-3 at 823 K. This tendency is the same as in the conventional ternary Fe-Cr-Ni alloys. Besides, Ni enrichment and Cr, Fe, Mn depletion on loops are observed at 823 K by scanning transmission electron microscopy coupled to energy dispersive X-ray spectroscopy and atom probe tomography with comparable RIS amplitude. This solute redistribution is explained by an inverse Kirkendall (IK) mechanism. In contrast, no obvious chemical segregation/depletion phenomena are detected at 298 K, which reveals the temperature dependence of the IK effect. This comprehensive study of loop behavior as a function of temperature gives a better understanding of CrFeMnNi MPEAs under irradiation.

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Declaration of competing interest

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Acknowledgments

This research is funded by the ANR-PRCE-HERIA project (ANR-19-CE08–0012–01). Claude Varillon and Mickaël Haering (MINES St-Etienne) are acknowledged for the alloys elaboration. We acknowledge the JANNuS-Orsay platform (IJCLab, Paris-Sac/CNRS, Orsay, France) for offering in-situ ion radiation facility. In particular, S. Jublot-Leclerc and C. Baumier are acknowledged for their help and advice during the experiments. Irradiation was also supported by the EMIR&A French accelerator network and by

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