Abstract
Electron microscopy was carried out on hydrogen bubbles in high purity aluminum. It was found for the first time that small hydrogen bubbles formed by irradiation with 15 keV hydrogen ions at 423 K converted to disk-shaped defects by annealing at higher temperature, depending on the initial concentration of bubbles. The many beam lattice image of the defects suggested that they mostly lay over multiple layers of (111) planes, containing characteristic distortions of the lattice on (111) planes. The formation of the disk-shaped defects is interpreted in terms of small hydrogen bubble coalescence during a random migration and collapse on (111) planes, losing their internal pressure, which may be allowed by the formation of aluminum hydride at high temperature.
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