Radiation stability of nanocrystalline single-phase multicomponent alloys
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FOCUS ISSUE
NANOCRYSTALLINE HIGH ENTROPY MATERIALS: PROCESSING CHALLENGES AND PROPERTIES
Radiation stability of nanocrystalline single-phase multicomponent alloys Emil Levo1,a) , Fredric Granberg1,b) Flyura Djurabekova3
, Daniel Utt2
, Karsten Albe2
, Kai Nordlund1
,
1
Department of Physics, University of Helsinki, Helsinki, FIN-00014, Finland Fachgebiet Materialmodellierung, Institut für Materialwissenschaft, TU Darmstadt, D-64287 Darmstadt, Germany 3 Helsinki Institute of Physics, University of Helsinki, FIN-00014, Finland; Department of Physics, University of Helsinki, Helsinki, FIN-00014, Finland; and Department of Plasma Physics, National Research Nuclear University MEPHI, 31 Moscow, Russia a) Address all correspondence to these authors. e-mail: emil.levo@helsinki.fi b) e-mail: fredric.granberg@helsinki.fi 2
Received: 31 July 2018; accepted: 14 January 2019
In search of materials with better properties, polycrystalline materials are often found to be superior to their respective single crystalline counterparts. Reduction of grain size in polycrystalline materials can drastically alter the properties of materials. When the grain sizes reach the nanometer scale, the improved mechanical response of the materials make them attractive in many applications. Multicomponent solid-solution alloys have shown to have a higher radiation tolerance compared with pure materials. Combining these advantages, we investigate the radiation tolerance of nanocrystalline multicomponent alloys. We find that these alloys withstand a much higher irradiation dose, compared with nanocrystalline Ni, before the nanocrystallinity is lost. Some of the investigated alloys managed to keep their nanocrystallinity for twice the irradiation dose as pure Ni.
Introduction Single crystalline multiprincipal element alloys have been found to exhibit many properties, which have been sought after for various applications. A group of such alloys is called high entropy alloys (HEAs). HEAs consist of at least five elements at roughly equal concentrations (5–35 at.%) [1, 2, 3]. For instance, HEAs have shown good corrosion and wear resistance [2], promising mechanical properties [2], thermal stability and hardness at high temperatures [2, 4, 5], good tensile strength at low temperatures [6], and improved ductility, fatigue, strength, and fracture resistance [6, 7, 8]. These are all properties required in future nuclear applications, such as generation IV reactors, which suggests HEAs as candidate materials for nuclear power plants. In this respect, radiation tolerance is one of the main requirements of newly developed materials. Studies on radiation resistance of HEAs have yielded favorable results [9, 10, 11, 12, 13, 14]. For example, a reduced defect growth has been observed in a subgroup of HEAs, the so-called equiatomic multicomponent (EAMC) alloys [10, 13]. Experimental studies on the irradiation resistance of HEAs have been conducted on both single crystalline alloys and
ª Materials Research Society 2019
polycrystalline materials [9, 11, 12, 1
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