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.
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14 September 2017
Research Article|
September 11 2017
Local segregation versus irradiation effects in high-entropy alloys: Steady-state conditions in a driven system
Leonie Koch;
Leonie Koch
a)
1
Fachgebiet Materialmodellierung, Institut für Materialwissenschaft, TU Darmstadt
, Jovanka-Bontschits-Straße 2, D-64287 Darmstadt, Germany
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Fredric Granberg
;
Fredric Granberg
2
Department of Physics, University of Helsinki
, P.O. Box 43, Helsinki FIN-00014, Finland
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Tobias Brink
;
Tobias Brink
1
Fachgebiet Materialmodellierung, Institut für Materialwissenschaft, TU Darmstadt
, Jovanka-Bontschits-Straße 2, D-64287 Darmstadt, Germany
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Daniel Utt
;
Daniel Utt
1
Fachgebiet Materialmodellierung, Institut für Materialwissenschaft, TU Darmstadt
, Jovanka-Bontschits-Straße 2, D-64287 Darmstadt, Germany
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Karsten Albe
;
Karsten Albe
1
Fachgebiet Materialmodellierung, Institut für Materialwissenschaft, TU Darmstadt
, Jovanka-Bontschits-Straße 2, D-64287 Darmstadt, Germany
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Flyura Djurabekova
;
Flyura Djurabekova
2
Department of Physics, University of Helsinki
, P.O. Box 43, Helsinki FIN-00014, Finland
3
Helsinki Institute of Physics, University of Helsinki
, P.O. Box 43, Helsinki FIN-00014, Finland
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Kai Nordlund
Kai Nordlund
2
Department of Physics, University of Helsinki
, P.O. Box 43, Helsinki FIN-00014, Finland
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a)
Electronic mail: koch@mm.tu-darmstadt.de
J. Appl. Phys. 122, 105106 (2017)
Article history
Received:
June 19 2017
Accepted:
August 24 2017
Citation
Leonie Koch, Fredric Granberg, Tobias Brink, Daniel Utt, Karsten Albe, Flyura Djurabekova, Kai Nordlund; Local segregation versus irradiation effects in high-entropy alloys: Steady-state conditions in a driven system. J. Appl. Phys. 14 September 2017; 122 (10): 105106. https://doi.org/10.1063/1.4990950
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