Abstract
Abstract Molybdenum specimens having bare and carbon-evaporated surfaces have been irradiated in air using a high-powered short-pulsed glass laser. The laser-induced surface damage and dislocation substructure ace observed at power densities > 2 × 108 W cm−2, while the formation of thin surface films are observed at power densities > 10111 cm−2. In the laser-induced surface damage, in particular, damage ripples have been found to be initiated and propagated from surface irregularities such as pits and grain boundaries. The thin surface film formed on the bare surface of molybdenum exhibits a fine duplex amorphous-crystalline structure. From the diffraction pattern of the crystalline phase, the film has been found to be composed of Mo2N. Such a nitride film has been detected not only on molybdenum but also on aluminium. Therefore, the formation of nitride films is thought to be a general phenomenon which may occur when metal surfaces arc irradiated in air by a short-pulsed laser beam at a power density whi...
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