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Title: Atom probe study of irradiation-enhanced α' precipitation in neutron-irradiated Fe–Cr model alloys

Atom probe tomography (APT) was performed to study the effects of Cr concentrations, irradiation doses and irradiation temperatures on a' phase formation in Fe-Cr model alloys (10-16 at.%) irradiated at 300 and 450°C to 0.01, 0.1 and 1 dpa. For 1 dpa specimens, α' precipitates with an average radius of 1.0-1.3 nm were observed. The precipitate density varied significantly from 1.1x10²³ to 2.7x10²⁴ 1/m³, depending on Cr concentrations and irradiation temperatures. The volume fraction of α' phase in 1 dpa specimens qualitatively agreed with the phase diagram prediction. For 0.01 dpa and 0.1 dpa, frequency distribution analysis detected slight Cr segregation in high-Cr specimens, but not in Fe-10Cr specimens. Proximity histogram analysis showed that the radial Cr concentration was highest at the center of a' precipitates. For most precipitates, the Cr contents were significantly lower than that predicted by the phase diagram. The Cr concentration at precipitate center increased with increasing precipitate size.
Authors:
 [1] ;  [1] ;  [2] ;  [1] ;  [1] ;  [3] ;  [3] ;  [4] ;  [1]
  1. Univ. of Illinois, Urbana, IL (United States). Dept. of Nuclear, Plasma and Radiology Engineering
  2. Boise State Univ., ID (United States). Dept. of Materials Science and Engineering; Center for Advanced Studies, Idaho Falls, ID (United States)
  3. Idaho National Lab. (INL), Idaho Falls, ID (United States)
  4. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
OSTI Identifier:
1182694
Report Number(s):
INL/JOU--15-34832
Journal ID: ISSN 0022-3115; TRN: US1500198
DOE Contract Number:
AC07-05ID14517; NEUP-485363-973000-191100
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; ATOMIC DISPLACEMENTS; PRECIPITATION; CONCENTRATION RATIO; NEUTRONS; IRRADIATION; PHASE DIAGRAMS; TEMPERATURE DEPENDENCE; TEMPERATURE RANGE 0400-1000 K; CHROMIUM; ABUNDANCE; CHROMIUM ALLOYS; IRON BASE ALLOYS; BINARY ALLOY SYSTEMS; ATOMS; PROBES; RADIATION DOSES; DENSITY; TOMOGRAPHY; SEGREGATION; PHYSICAL RADIATION EFFECTS α' precipitation; atom probe; Fe-Cr model alloy; neutron irradiated