Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 7 of 7 for “"lattice diffusion"”.
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Hydrogen Embrittlement of Nickel
… modes of hydrogen segregation are investigated; lattice diffusion and dislocation transport of "Cottrell atmospheres" of hydrogen. The effect of cosegregation of hydrogen and sulfur is also explored.
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Synthesis, Consolidation, and Mechanical Testing of Nanophase Metals
… lower than activation energy for grain boundary diffusion in microcrystalline materials. A model is proposed to explain the higher creep rate. It assumes that the specimens produced from vapor condensed powders have a higher grain boundary energy due to a higher disorder in their grain boundary …
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Electromigration and chemical diffusion in titanium carbide
The ionic charge and lattice diffusion of carbon in titanium carbide have been investigated through studies of diffusion under the influences of kan applied dc-electric field and of a chemical potential. The electron microprobe was used to measure the diffusion concentration profiles. …
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Constrained sintering of gold circuit films on rigid substrates
… with the activation energies for grain-boundary diffusion and lattice diffusion respectively, for gold as found in literature. Hence from our results of the activation energies for densification of the constrained and freestanding gold films, coupled with our studies on grain growth and stress, …
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The modelling of damage due to diffusional creep in high chromium steels
… and conditions recorded in modern power plants, diffusional creep by vacancy migration is seen to be the dominant creep mechanism. However, the understanding of diffusional creep in particle stabilized materials is heavily incomplete. The aim of this project was to model the damage caused by …
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Lattice gas models and simulations of epitaxial growth
… (MBE). The basic idea is to use a discrete lattice gas representation of the crystal structure, and to apply kinetic Monte Carlo (KMC) simulations for the description of the growth dynamics. The main advantage of the KMC approach is the possibility to account for atomistic details and at the …
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Silicon and oxygen self-diffusion in forsterite and implications to upper-mantle rheology
(1) Silicon lattice diffusion coefficient in dry forsterite The high temperature creep of olivine is believed to be controlled by self-diffusion of olivine. However, the experimentally measured silicon diffusion coefficients (DSi) [Dohmen et al., 2002; Jaoul et al., 1981] were about 2-3 orders of …