Damage buildup and edge dislocation mobility in equiatomic multicomponent alloys

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http://hdl.handle.net/10138/307106

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Granberg , F , Djurabekova , F , Levo , E & Nordlund , K 2017 , ' Damage buildup and edge dislocation mobility in equiatomic multicomponent alloys ' , Nuclear Instruments & Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms , vol. 393 , pp. 114-117 . https://doi.org/10.1016/j.nimb.2016.11.012

Title: Damage buildup and edge dislocation mobility in equiatomic multicomponent alloys
Author: Granberg, Fredric; Djurabekova, Flyura; Levo, Emil; Nordlund, Kai
Contributor: University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
Date: 2017-02
Language: eng
Number of pages: 4
Belongs to series: Nuclear Instruments & Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms
ISSN: 0168-583X
URI: http://hdl.handle.net/10138/307106
Abstract: A new class of single phase metal alloys of equal atomic concentrations has shown very promising mechanical properties and good corrosion resistance. Moreover, a significant reduction in damage accumulation during prolonged irradiation has also been observed in these equiatomic multicomponent alloys. A comparison of elemental Ni with the two component NiFe- and the three component NiCoCr-alloy showed a substantial reduction in damage in both alloys, and an even larger difference was seen if only larger clusters were considered. One of the factors limiting the damage build-up in the alloys compared to the elemental material was seen to be dislocation mobility (Granberg et al., 2016). In this Article, we focus on a more thorough investigation of the mobility of edge dislocations in different cases of the Ni-, NiFe- and NiCoCr-samples. We find that even though the saturated amount of defects in the alloys is lower than in elemental Ni, the defect buildup in the early stages is faster in the alloys. We also find that the dislocation mobility in NiFe is lower than in Ni, at low stresses, and that the onset stress in NiFe is higher than in Ni. The same phenomenon was seen in comparison between NiFe and NiCoCr, since the three component alloy had lower dislocation mobility and higher onset stress. The dislocation velocity in elemental Ni plateaued out just under the forbidden velocity, whereas the alloys showed a more complex behaviour. (C) 2016 Published by Elsevier B.V.
Subject: 114 Physical sciences
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