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Phys Rev Lett. 2016 Apr 1;116(13):135504. doi: 10.1103/PhysRevLett.116.135504. Epub 2016 Apr 1.

Mechanism of Radiation Damage Reduction in Equiatomic Multicomponent Single Phase Alloys.

Author information

1
Department of Physics, University of Helsinki, Post-office box 43, FIN-00014, Finland.
2
Department of Physics, University of Helsinki, Post-office box 43, FIN-00014, Finland and Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
3
Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
4
Department of Nuclear Engineering and Radiological Sciences, University of Michigan, Ann Arbor, Michigan 48109-2104, USA.
5
Helsinki Institute of Physics, University of Helsinki, Post-office box 43, FIN-00014, Finland and Department of Physics, University of Helsinki, Post-office box 43, FIN-00014, Finland.
6
Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA and Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, USA.

Abstract

Recently a new class of metal alloys, of single-phase multicomponent composition at roughly equal atomic concentrations ("equiatomic"), have been shown to exhibit promising mechanical, magnetic, and corrosion resistance properties, in particular, at high temperatures. These features make them potential candidates for components of next-generation nuclear reactors and other high-radiation environments that will involve high temperatures combined with corrosive environments and extreme radiation exposure. In spite of a wide range of recent studies of many important properties of these alloys, their radiation tolerance at high doses remains unexplored. In this work, a combination of experimental and modeling efforts reveals a substantial reduction of damage accumulation under prolonged irradiation in single-phase NiFe and NiCoCr alloys compared to elemental Ni. This effect is explained by reduced dislocation mobility, which leads to slower growth of large dislocation structures. Moreover, there is no observable phase separation, ordering, or amorphization, pointing to a high phase stability of this class of alloys.

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