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Friction stir welding of commercially pure iron and nickel was carried out using a polycrystalline cubic boron nitride tool. The macroscopic flow of the two phases generally corresponded to that predicted by the mixing models proposed in the literature. The interface region, however, revealed striations of the phases suggesting a complex flow pattern. Transmission electron microscopy and high resolution...
Thick silver films vapour deposited under ultra high vacuum onto high purity nickel foils, dewet the substrate when annealed at high temperature in air. No hole is observed in the silver film after an annealing at the same temperature in a pure argon atmosphere. SEM observations of the film surface and of cross-sections reveal that dewetting occurs when a nickel oxide layer is formed at the silver-nickel...
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