Local segregation versus irradiation effects in high-entropy alloys : Steady-state conditions in a driven system

Show full item record



Permalink

http://hdl.handle.net/10138/297920

Citation

Koch , L , Granberg , F , Brink , T , Utt , D , Albe , K , Djurabekova , F & Nordlund , K 2017 , ' Local segregation versus irradiation effects in high-entropy alloys : Steady-state conditions in a driven system ' , Journal of Applied Physics , vol. 122 , no. 10 , 105106 . https://doi.org/10.1063/1.4990950

Title: Local segregation versus irradiation effects in high-entropy alloys : Steady-state conditions in a driven system
Author: Koch, Leonie; Granberg, Fredric; Brink, Tobias; Utt, Daniel; Albe, Karsten; Djurabekova, Flyura; Nordlund, Kai
Contributor: University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
Date: 2017-09-14
Language: eng
Number of pages: 10
Belongs to series: Journal of Applied Physics
ISSN: 0021-8979
URI: http://hdl.handle.net/10138/297920
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.
Subject: 114 Physical sciences
Rights:


Files in this item

Total number of downloads: Loading...

Files Size Format View
1.4990950.pdf 2.092Mb PDF View/Open

This item appears in the following Collection(s)

Show full item record