Koch, Leonie ; Granberg, Fredric ; Brink, Tobias ; Utt, Daniel ; Albe, Karsten ; Djurabekova, Flyura ; Nordlund, Kai (2017)
Local segregation versus irradiation effects in high-entropy alloys: Steady-state conditions in a driven system.
In: Journal of Applied Physics, 122 (10)
doi: 10.1063/1.4990950
Article, Bibliographie
Abstract
We study order transitions and defect formation in a model high-entropy alloy (CuNiCoFe) under ion irradiation by means of molecular dynamics simulations. Using a hybrid Monte-Carlo/molecular dynamics scheme, a model alloy is generated which is thermodynamically stabilized by configurational entropy at elevated temperatures, but partly decomposes at lower temperatures by copper precipitation. Both the high-entropy and the multiphase sample are then subjected to simulated particle irradiation. The damage accumulation is analyzed and compared to an elemental Ni reference system. The results reveal that the high-entropy alloy—independent of the initial configuration—installs a certain fraction of short-range order even under particle irradiation. Moreover, the results provide evidence that defect accumulation is reduced in the high-entropy alloy. This is because the reduced mobility of point defects leads to a steady state of defect creation and annihilation. The lattice defects generated by irradiation are shown to act as sinks for Cu segregation.
| Item Type: | Article |
|---|---|
| Erschienen: | 2017 |
| Creators: | Koch, Leonie ; Granberg, Fredric ; Brink, Tobias ; Utt, Daniel ; Albe, Karsten ; Djurabekova, Flyura ; Nordlund, Kai |
| Type of entry: | Bibliographie |
| Title: | Local segregation versus irradiation effects in high-entropy alloys: Steady-state conditions in a driven system |
| Language: | English |
| Date: | 11 September 2017 |
| Journal or Publication Title: | Journal of Applied Physics |
| Volume of the journal: | 122 |
| Issue Number: | 10 |
| DOI: | 10.1063/1.4990950 |
| Abstract: | We study order transitions and defect formation in a model high-entropy alloy (CuNiCoFe) under ion irradiation by means of molecular dynamics simulations. Using a hybrid Monte-Carlo/molecular dynamics scheme, a model alloy is generated which is thermodynamically stabilized by configurational entropy at elevated temperatures, but partly decomposes at lower temperatures by copper precipitation. Both the high-entropy and the multiphase sample are then subjected to simulated particle irradiation. The damage accumulation is analyzed and compared to an elemental Ni reference system. The results reveal that the high-entropy alloy—independent of the initial configuration—installs a certain fraction of short-range order even under particle irradiation. Moreover, the results provide evidence that defect accumulation is reduced in the high-entropy alloy. This is because the reduced mobility of point defects leads to a steady state of defect creation and annihilation. The lattice defects generated by irradiation are shown to act as sinks for Cu segregation. |
| Uncontrolled Keywords: | Amorphous metals, Transition, Crystal defects, Molecular dynamics, Entropy |
| Divisions: | 11 Department of Materials and Earth Sciences > Material Science > Materials Modelling Zentrale Einrichtungen > University IT-Service and Computing Centre (HRZ) > Hochleistungsrechner 11 Department of Materials and Earth Sciences > Material Science Zentrale Einrichtungen > University IT-Service and Computing Centre (HRZ) 11 Department of Materials and Earth Sciences Zentrale Einrichtungen |
| Date Deposited: | 19 Sep 2017 11:39 |
| Last Modified: | 21 Sep 2017 08:20 |
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