Microsegregation observed in Fe-35. 5Ni-7. 5Cr irradiated in EBR-II

Conference · Thu Mar 01 04:00:00 EST 1984

OSTI ID:6231945

Brager, H R; Garner, F A

In another recent study of the compositional dependence of swelling in annealed Fe-Ni-Cr alloys, it was found that some annealed alloys densified during irradiation. No precipitate phases were observed to form however. At 593/sup 0/C one alloy, Fe-35.5Ni-7.5Cr, which was particularly resistant to swelling, increased in density .9% at 7.6 x 10/sup 22/ n/cm/sup 2/ (E > 0.1 MeV). Examination by energy dispersive x-ray analysis revealed that substantial oscillations occur in the nickel content of the alloy, varying from 25 to 53% about the nominal level of 35.5%. These oscillations exhibit a period of approx. 200 nm. Regions enriched in nickel are depleted in chromium and iron, and the reverse is true in regions of low nickel content. This spinodal-like process produces a net densification and also appears to eventually destroy the swelling resistance of the alloy. Once voids form in the nickel-poor chromium-rich regions, further segregation of nickel to void surfaces is expected to accelerate the loss of swelling resistance.

• Research Organization: Hanford Engineering Development Lab., Richland, WA (USA)
• DOE Contract Number: AC06-76FF02170
• OSTI ID: 6231945
• Report Number(s): HEDL-SA-3027-FP; CONF-840604-24; ON: DE85001657
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360106* -- Metals & Alloys-- Radiation Effects
ALLOY SYSTEMS
ALLOYS
BEAMS
BREEDER REACTORS
CHROMIUM ALLOYS
EBR-2 REACTOR
EPITHERMAL REACTORS
EXPERIMENTAL REACTORS
FAST REACTORS
FBR TYPE REACTORS
IRON ALLOYS
IRON BASE ALLOYS
LIQUID METAL COOLED REACTORS
LMFBR TYPE REACTORS
NEUTRON BEAMS
NICKEL ALLOYS
NUCLEON BEAMS
PARTICLE BEAMS
PHYSICAL RADIATION EFFECTS
POWER REACTORS
RADIATION EFFECTS
REACTORS
RESEARCH AND TEST REACTORS
SEGREGATION
SODIUM COOLED REACTORS
TERNARY ALLOY SYSTEMS