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Title: Irradiation-induced grain growth in nanocrystalline reduced activation ferrite/martensite steel

In this work, we investigate the microstructure evolution of surface-nanocrystallized reduced activation ferrite/martensite steels upon high-dose helium ion irradiation (24.3 dpa). We report a significant irradiation-induced grain growth in the irradiated buried layer at a depth of 300–500 nm, rather than at the peak damage region (at a depth of ∼840 nm). This phenomenon can be explained by the thermal spike model: minimization of the grain boundary (GB) curvature resulting from atomic diffusion in the cascade center near GBs.
Authors:
;  [1] ;  [2] ; ;  [1] ;  [3] ;  [4] ;  [5]
  1. Key Laboratory of Advanced Materials of Ministry of Education, School of Materials Science and Engineering, Tsinghua University, Beijing 100084 (China)
  2. (United States)
  3. Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802 (United States)
  4. Department of Nuclear Science and Technology, Xi'an Jiaotong University, Xi'an 710049 (China)
  5. Institute of Modern Physics, Chinese Academy of Science, Lanzhou 730000 (China)
Publication Date:
OSTI Identifier:
22350747
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 12; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ATOMIC DISPLACEMENTS; CRYSTALS; DAMAGE; DIFFUSION; FERRITES; GRAIN BOUNDARIES; GRAIN GROWTH; HELIUM IONS; IRRADIATION; LAYERS; MARTENSITE; MINIMIZATION; NANOSTRUCTURES; PHYSICAL RADIATION EFFECTS; RADIATION DOSES; STEELS; SURFACES; THERMAL SPIKES