Journal of Applied Physics · 1958 · 367 citations · 15 references
EngineeringRadiation Materials ScienceEnhanced Diffusion RateCorrosionRadiation Enhanced DiffusionTransport PhenomenaThermodynamicsRadiation ChemistryFusion Reactor MaterialNuclear ReactorsMaterials ScienceEnhanced DiffusionPhysicsRadiation TransportHeat TransferHigh Temperature MaterialsDiffusion ResistanceApplied PhysicsDiffusion ProcessSimple Theory
Radiation enhanced diffusion has implications for material performance and warrants further investigation. The study used alpha‑brass, a kinetically simple alloy, and monitored diffusion via electrical resistivity changes linked to short‑range order. The theory predicts flux‑ and temperature‑dependent enhancement, and measurements in alpha‑brass show temperature‑independent diffusion up to 150 °C, supporting the hypothesis that defects are removed at internal surfaces and that temperature‑dependent measurements can reveal the defect‑removal mechanism.
A simple theory of radiation enhanced diffusion has been worked out which describes the dependence of this enhancement on flux and temperature under steady-state conditions. The theoretical study also shows that the measurement of enhanced diffusion as a function of temperature can indicate the mechanism by which defects are removed from the lattice. Alpha-brass was chosen for the experimental work because it is a kinetically simple system, not complicated by nucleation, in which diffusion is easily followed by measuring the electrical resistivity changes associated with changes in short-range order. The enhanced diffusion rate during irradiation in the Brookhaven reactor has been measured in this alloy at several temperatures in the range 0 to 190°C. This enhancement is independent of temperature from 0 to 150°C, in excellent agreement with the theoretical predictions for the case where the radiation induced defects finally disappear at internal surfaces. Some implications of radiation enhanced diffusion and suggestions for further study are also discussed.
15
G. J. Dienes · Annual Review of Nuclear Science · 1953 · 558 citations
On the generation of vacancies by moving dislocations
Frederick Seitz · Advances In Physics · 1952 · 342 citations
Theory of Order-Disorder Kinetics
George H. Vineyard · Physical Review · 1956 · 165 citations
Materials Science, Short-range Order, Quantum Lattice System +14
Kinetics of order-disorder transformations
G. J. Dienes · Acta Metallurgica · 1955 · 158 citations
Engineering, Physics, Entropy +6