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Void swelling in the molybdenum alloy TZM irradiated to high fluence

Conference ·
OSTI ID:6256664
; ;

Microstructural development and density change measurements are reported for TZM, a commercial molybdenum base alloy, following fast neutron irradiation in EBR-II to high fluence over the temperature range 400 to 650/sup 0/C. Uniformly distributed voids arrayed in a lattice and constituting 3% swelling were observed following irradiation at 650/sup 0/C to 14.7 x 10/sup 22/ n/cm/sup 2/ (E > 0.1 MeV) (53 dpa). Nonuniformly distributed rafts of voids in lattice arrays were observed following irradiation at 540/sup 0/C to 13.6 x 10/sup 22/ n/cm/sup 2/. Void swelling was not resolved following irradiation at 425/sup 0/C to 12.2 x 10/sup 22/ n/cm/sup 2/. Void swelling measurements corroborated density change results which showed peak void swelling behavior saturating at 590/sup 0/C. Two mechanisms for the behavior observed are considered; the first is based on an apparent maximum void size of 10 nm which leads to void rafting and eventually to void swelling saturation. Saturation is predicted only after 10/sup 24/ n/cm/sup 2/ (360 dpa) with 20% swelling possible. The second mechanism considers the effect of a developing void lattice on dislocation dynamics. In either case, at goal fluence for a fusion reactor first wall, only 4% swelling is anticipated which would not represent a design limitation.

Research Organization:
Hanford Engineering Development Lab., Richland, WA (USA)
DOE Contract Number:
AC14-76FF02170
OSTI ID:
6256664
Report Number(s):
HEDL-SA-2336-FP; CONF-810831-41; ON: DE81029802
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
360106* -- Metals & Alloys-- Radiation Effects
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700209 -- Fusion Power Plant Technology-- Component Development & Materials Testing
ALLOY-TZM
ALLOYS
BARYON REACTIONS
CRYSTAL STRUCTURE
HADRON REACTIONS
HIGH TEMPERATURE
MICROSTRUCTURE
MOLYBDENUM ALLOYS
MOLYBDENUM BASE ALLOYS
NEUTRON REACTIONS
NUCLEAR REACTIONS
NUCLEON REACTIONS
PHYSICAL RADIATION EFFECTS
RADIATION EFFECTS
SWELLING
TITANIUM ALLOYS
VOIDS
ZIRCONIUM ALLOYS