Abstract
Due to virtually no solubility, He atoms implanted or created inside materials tend to form bubbles, which are known to damage material properties through embrittlement. Higher He density in nano-sized bubbles was observed both experimentally and computationally in Ni(100−x)Fex-alloy samples compared to Ni. The bubbles in the Ni(100−x)Fex-alloys were observed to be faceted, whereas in elemental Ni they were more spherical. Molecular dynamics simulations showed that stacking fault structures formed around bubbles at maximum He density. Higher Fe concentrations stabilize stacking fault structures, suppress evolution of dislocation network around bubbles and suppress complete dislocation emission, leading to higher He density.
| Original language | English |
|---|---|
| Pages (from-to) | 1-6 |
| Number of pages | 6 |
| Journal | Scripta Materialia |
| Volume | 191 |
| DOIs | |
| State | Published - Jan 15 2021 |
Funding
This work has partially been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014–2018 and 2019–2020 under grant agreement No. 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission. This work was partially supported by the Energy Dissipation to Defect Evolution (EDDE) Center, an Energy Frontier Research Center funded by the U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences. Computer time granted by CSC and FGCI (persistent identifier urn:nbn:fi:research-infras-2016072533) are gratefully acknowledged. Electron microscopy analyses were performed as part of a user proposal at ORNL’s Center for Nanophase Materials Sciences (CNMS), which is U.S. DOE Office of Science User Facility. Helium ion irradiation was performed at the Center for Integrated Nanotechnologies (CINT), an Office of Science User Facility operated for the U.S. Department of Energy (DOE) Office of Science. Los Alamos National Laboratory, an affirmative action equal opportunity employer, is managed by Triad National Security, LLC for the U.S. Department of Energy’s NNSA, under contract 89233218CNA000001. This work has partially been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014?2018 and 2019?2020 under grant agreement No. 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission. This work was partially supported by the Energy Dissipation to Defect Evolution (EDDE) Center, an Energy Frontier Research Center funded by the U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences. Computer time granted by CSC and FGCI (persistent identifier urn:nbn:fi:research-infras-2016072533) are gratefully acknowledged. Electron microscopy analyses were performed as part of a user proposal at ORNL's Center for Nanophase Materials Sciences (CNMS), which is U.S. DOE Office of Science User Facility. Helium ion irradiation was performed at the Center for Integrated Nanotechnologies (CINT), an Office of Science User Facility operated for the U.S. Department of Energy (DOE) Office of Science. Los Alamos National Laboratory, an affirmative action equal opportunity employer, is managed by Triad National Security, LLC for the U.S. Department of Energy's NNSA, under contract 89233218CNA000001.
| Funders | Funder number |
|---|---|
| FGCI | research-infras-2016072533 |
| U.S. Department of Energy | |
| Office of Science | |
| Basic Energy Sciences | |
| Los Alamos National Laboratory | 89233218CNA000001 |
| H2020 Euratom | 633053 |
| China Scholarship Council |
Keywords
- Electron energy loss spectroscopy (EELS)
- He-bubbles
- Molecular dynamics (MD)
- NiFe-alloys