Low dose irradiation creep of pure nickel. [17 or 15 MeV deuterons]
A climb-controlled glide model of low dose irradiation creep was developed to rationalize irradiation creep data of pure nickel irradiated in a light ion irradiation creep apparatus. Pure nickel specimens (99.992% Ni), with three different microstructures, were irradiated with 17 or 15 MeV deuterons at 473 K and stresses ranging from 0.35 to 0.9 of the unirradiated yield stress. Transmission electron microscopy revealed the microstructure following irradiation. The creep modeling demonstrated that low dose irradiation creep is controlled by the interaction between glide dislocations and the small, dispersed dislocation loops. The creep model predicted creep rates proportional to the mobile dislocation density and a comparison of experimental irradiation creep rates as a function of homologous stress revealed a dependence on initial microstructure of the magnitude predicted by the measured dislocation densities. The three microstructures that were irradiated consisted of 85% and 25% cold-worked Ni specimens and well-annealed Ni specimens. A weak stress dependence of irradiation creep was observed in 85% cold-worked Ni in agreement with experimental results by others. The weak stress dependence was shown to be a consequence of the stress independence of the dislocation climb velocity and the weak stress dependence of the barrier removal process. The irradiation creep rate was observed to be proportional to the applied stress. This linear stress dependence was suggested to be due to the stress dependence of the mobile dislocation density.
- OSTI ID:
- 6793718
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360106* -- Metals & Alloys-- Radiation Effects
CHARGED PARTICLES
CREEP
CRYSTAL STRUCTURE
DEUTERONS
ELEMENTS
ENERGY RANGE
HIGH TEMPERATURE
IRRADIATION
MECHANICAL PROPERTIES
METALS
MEV RANGE
MEV RANGE 10-100
MICROSTRUCTURE
NICKEL
PHYSICAL RADIATION EFFECTS
RADIATION EFFECTS
STRESSES
TRANSITION ELEMENTS