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Title: Mechanism of Radiation Damage Reduction in Equiatomic Multicomponent Single Phase Alloys

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. Finally and moreover, there is no observable phase separation, ordering, or amorphization, pointing to a high phase stability of this class of alloys.
Authors:
 [1] ;  [1] ;  [2] ;  [3] ;  [4] ;  [3] ;  [4] ;  [5] ;  [6] ;  [3]
  1. Univ. of Helsinki (Finland). Dept. of Physics
  2. Univ. of Helsinki (Finland). Dept. of Physics; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Science and Technology Division
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
  4. Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Nuclear Engineering and Radiological Sciences
  5. Univ. of Helsinki (Finland). Helsinki Inst. of Physics; Univ. of Helsinki (Finland). Dept. of Physics
  6. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering
Publication Date:
Grant/Contract Number:
AC05-00OR22725; 633053; DEAC02-05CH11231
Type:
Published Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 116; Journal Issue: 13; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); European Consortium for the Development of Fusion Energy (EUROfusion), Garching (Germany); Academy of Finland, Helsinki (Finland)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE
OSTI Identifier:
1245043
Alternate Identifier(s):
OSTI ID: 1261311