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THE EFFECT OF NEUTRON IRRADIATION ON THE MECHANICAL PROPERTIES OF MOLYBDENUM AND TUNGSTEN

Journal Article · · J. Inst. Metals
OSTI ID:4333511
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The changes in mechanical properties of stress-relieved Mo and fully recrystallized W after irradiation at 100 deg C with 5 x 10/sup 19/ neutrons/cm/ sup 2/ have been studied at a variety of temperatures, and from these tests the influence of irradiation on the ductile yields brittle transition temperature has been found. The yield stress of Mo was increased by irradiation at all testing temperatures between 20 and 200 deg C, the increase being greater the higher the temperature. A marked yield point was developed in irradiated Mo after an anneal at 200 deg C for 60 min., suggesting migration to, and anchoring of, dislocations by vacancies produced during irradiation. The elongation before fracture was reduced by the irradiation. The ductile yields brittle transition temperature of Mo was raised from -136 to -73 deg C by irradiation, in marked contrast to the small rise (from 118 to 126 deg C) in the transition temperature of fully recrystallized W after an equal neutron dose. It is concluded that the magnitude of the increase in transition temperature due to irradiation is very dependent upon the initial transition temperature, being greater the lower the initial value. (auth)
Research Organization:
Atomic Energy Research Establishment, Harwell, Berks
NSA Number:
NSA-12-000666
OSTI ID:
4333511
Journal Information:
J. Inst. Metals, Journal Name: J. Inst. Metals Vol. Vol: 86
Country of Publication:
Country unknown/Code not available
Language:
English

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Related Subjects

ANNEALING
BRITTLENESS
DEFECTS
DISLOCATIONS
DUCTILITY
IRRADIATION
MECHANICAL PROPERTIES
MOLYBDENUM
NEUTRON FLUX
NEUTRONS
PHYSICS
RADIATION DOSES
RADIATION EFFECTS
TEMPERATURE
TUNGSTEN