Abstract
High entropy alloys have gained significant interest due to several unique properties including enhanced radiation resistance. In this work, radiation induced segregation, a key phenomenon observed in alloys under irradiation, is examined for the first time at high angle grain boundaries under Ni heavy ion irradiation in the CoCrFeNiMn alloy. Our experimental study indicates significant Mn depletion and Co and Ni enrichment at grain boundaries. The segregation is discussed in the context of a proposed vacancy dominated radiation induced segregation mechanism and compared to existing models in conventional single core component alloys including stainless steels.
| Original language | English |
|---|---|
| Pages (from-to) | 80-84 |
| Number of pages | 5 |
| Journal | Scripta Materialia |
| Volume | 156 |
| DOIs | |
| State | Published - Nov 2018 |
Funding
C.M.B, J.E.N, and M.L.T acknowledge funding in part from the US National Science Foundation under contract 1429661 (supporting TEM instrumentation) and contract 1105681 (supporting C.M.B), and in part from the US Department of Energy, Office of Basic Energy Sciences under contract DE-SC0008274 (supporting J.E.N). 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. Los Alamos National Laboratory, an affirmative action equal opportunity employer, is operated by Los Alamos National Security, LLC, for the National Nuclear Security Administration of the U.S. DOE under contract DE-AC52-06NA25396. Y. Zhang acknowledges the support of the National Natural Science Foundation of China (No. 50471025 and No. 51470124). The STEM-EDS microscopy was supported by the Center for Nanophase Materials Sciences, which is a DOE Office of Science User Facility and by using instrumentation (FEI Talos F200X S/TEM) provided by the Department of Energy, Office of Nuclear Energy, Fuel Cycle R&D Program and the Nuclear Science User Facilities.
| Funders | Funder number |
|---|---|
| Center for Nanophase Materials Sciences | |
| National Science Foundation | |
| U.S. Department of Energy | |
| Directorate for Mathematical and Physical Sciences | 1105681, 1429661 |
| Office of Science | |
| Basic Energy Sciences | DE-SC0008274 |
| National Nuclear Security Administration | DE-AC52-06NA25396 |
| Los Alamos National Laboratory | |
| National Natural Science Foundation of China | 50471025, 51470124 |
Keywords
- Chemical complexity
- Grain boundaries
- High entropy alloys
- Radiation damage
- Radiation induced segregation