Abstract
This study aims to compare the effects of neutron and self-ion irradiation on the mechanical properties and microstructural evolution in W. Neutron irradiation at the HFR reactor to 1.67 dpa at 800 °C resulted in the formation of large Re and Os rich clusters and voids. The post-irradiation composition was measured using APT and verfified against FISPACT modelling. The measured Re and Os concentration was used to create alloys with equivalent concentrations of Re and Os. These alloys were exposed to self-ion irradiation to a peak dose of 1.7 dpa at 800 °C. APT showed that self-ion irradiation leads to the formation of small Os clusters, wheras under neutron irradiation large Re/Os clusters form. Voids are formed by both ion and neutron irradiation, but the voids formed by neutron irradiation are larger. By comparing the behaviour of W-1.4Re and W-1.4Re-0.1Os, suppression of Re cluster formation was observed. Irradiation hardening was measured using nanoindentation and was found to be 2.7 GPa, after neutron irradiation and 1.6 GPa and 0.6 GPa for the self-ion irradiated W-1.4Re and W-1.4Re-0.1Os. The higher hardening is attributed to the barrier strength of large voids and Re/Os clusters that are observed after neutron irradiation.
| Original language | English |
|---|---|
| Article number | 101991 |
| Number of pages | 15 |
| Journal | Materialia |
| Volume | 33 |
| Early online date | 2 Feb 2024 |
| DOIs | |
| Publication status | Published - Mar 2024 |
Bibliographical note
Acknowledgments:This project (MJL) has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement number 633053. The views expressed herein do not necessarily reflect those of the European Commission. MJL's work is also supported by the UK Engineering and Physical Sciences Research Council [EP/N509711/1] and the Culham Centre for Fusion Energy, United Kingdom Atomic Energy Authority through an Industrial CASE scholarship, [Project reference number 1802461]. Atom Probe Tomography was carried out at the Oxford Materials Atom Probe Group, and was supported by EPSRC grant EP/M022803/1 “A LEAP 5000XR for the UK National Atom Probe Facility.” The authors acknowledge use of characterisation facilities within the David Cockayne Centre for Electron Microscopy, Department of Materials, University of Oxford, alongside financial support provided by the Henry Royce Institute(Grant ref EP/R010145/1). The research also used UKAEA's Materials Research Facility, which has been funded by and is a part of the UK National Nuclear User Facility and Henry Royce Institute for Advanced Materials. JH and DNM acknowledge funding from the RCUK Energy Programme Grant No. EP/W006839/1. DNM work is carried out within the framework of the EUROfusion Consortium, funded by the European Union via the Euratom Research and Training Programme (Grant Agreement No 101052200 — EUROfusion). Views and opinions expressed are however those of the author only and do not necessarily reflect those of the European Union or the European Commission. This work was performed, in part, at the center for Integrated Nanotechnologies, an Office of Science User Facility operated for the U.S. Department of Energy (DOE) Office of Science. Sandia National Laboratories is a multimission laboratory managed and operated by National Technology & Engineering Solutions of Sandia, LLC, a wholly owned subsidiary of Honeywell International, Inc., for the U.S. DOE's National Nuclear Security Administration under contract DE-NA-0003525. The views expressed in the article do not necessarily represent the views of the U.S. DOE or the United States Government. DEJA Thanks SGR for the foresight to have these samples irradiated in the first place.
Keywords
- Neutron irradiation
- Ion irradiation
- Tungsten
- Tungsten rhenium osmium alloys