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

Journal Article · Wed Jul 01 00:00:00 EDT 2015 · Journal of Nuclear Materials

DOI:https://doi.org/10.1016/j.jnucmat.2015.04.005· OSTI ID:1182694

Chen, Wei -Ying ^[1]; Miao, Yinbin ^[1]; Wu, Yaqiao ^[2]; Tomchik, Carolyn A. ^[1]; Mo, Kun ^[1]; Gan, Jian ^[3]; Okuniewski, Maria A. ^[3]; Maloy, Stuart A. ^[4]; Stubbins, James F. ^[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)

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.

• Research Organization: Idaho National Lab. (INL), Idaho Falls, ID (United States)
• Sponsoring Organization: USDOE Office of Nuclear Energy (NE)
• DOE Contract Number: AC07-05ID14517; NEUP-485363-973000-191100
• OSTI ID: 1182694
• Report Number(s): INL/JOU-15-34832; TRN: US1500198
• Journal Information: Journal of Nuclear Materials, Vol. 462, Issue C; ISSN 0022-3115
• Publisher: Elsevier
• Country of Publication: United States
• Language: English

Related Subjects

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