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Title: Microstructural stability of a self-ion irradiated lanthana-bearing nanostructured ferritic steel

Thermally stable nanofeatures with high number density are expected to impart excellent high temperature strength and irradiation stability in nanostructured ferritic steels (NFSs) which have potential applications in advanced nuclear reactors. A lanthana-bearing NFS (14LMT) developed via mechanical alloying and spark plasma sintering was used in this study. The sintered samples were irradiated by Fe2+ ions to 10, 50 and 100 dpa at 30 °C and 500 °C. Microstructural and mechanical characteristics of the irradiated samples were studied using different microscopy techniques and nanoindentation, respectively. Overall morphology and number density of the nanofeatures remained unchanged after irradiation. Average radius of nanofeatures in the irradiated sample (100 dpa at 500 °C) was slightly reduced. A notable level of irradiation hardening and enhanced dislocation activity occurred after ion irradiation except at 30 °C and ≥50 dpa. Other microstructural features like grain boundaries and high density of dislocations also provided defect sinks to assist in defect removal.
Authors:
 [1] ;  [1] ;  [2] ;  [3] ;  [2] ;  [4] ;  [5] ;  [5]
  1. Univ. of Idaho, Moscow, ID (United States). Dept. of Chemical and Materials Engineering; Center for Advanced Energy Studies, Idaho Falls, ID (United States)
  2. Center for Advanced Energy Studies, Idaho Falls, ID (United States); Boise State Univ., ID (United States). Dept. of Materials Science and Engineering
  3. Univ. of Idaho, Moscow, ID (United States). Dept. of Chemical and Materials Engineering; King Abdulaziz City for Science and Technology, Riyadh (Saudi Arabia). Atomic Energy Research Inst.
  4. Center for Advanced Energy Studies, Idaho Falls, ID (United States); Idaho National Lab. (INL), Idaho Falls, ID (United States)
  5. Texas A & M Univ., College Station, TX (United States). Dept. of Nuclear Engineering
Publication Date:
OSTI Identifier:
1184715
Report Number(s):
INL/JOU--14-32947
Journal ID: ISSN 0022-3115; TRN: US1500200
DOE Contract Number:
AC07-05ID14517
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Nuclear Materials; Journal Volume: 462; Journal Issue: C
Publisher:
Elsevier
Research Org:
Idaho National Laboratory (INL), Idaho Falls, ID (United States)
Sponsoring Org:
USDOE Office of Nuclear Energy (NE)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 77 NANOSCIENCE AND NANOTECHNOLOGY; FERRITIC STEELS; GRAIN BOUNDARIES; IRON IONS; ATOMIC DISPLACEMENTS; DISLOCATIONS; IRRADIATION; TEMPERATURE RANGE 0400-1000 K; TEMPERATURE RANGE 0273-0400 K; NANOSTRUCTURES; STABILITY; DEFECTS; SINTERING; RADIATION HARDENING; MICROSCOPY; MORPHOLOGY; REACTOR MATERIALS; LANTHANUM OXIDES; REMOVAL; SINKS l ion irradiation; microstructural stability; nanostructured ferritc steel