Abstract
Abstract Aluminium single crystals have been irradiated at room temperature with 50 keV A1+ ions along low-index crystallographic directions. Depth distributions of the produced defects have been obtained by stereo electron microscopy. They are compared with the theoretical damage distribution for an amorphous target, and good agreement is found for random irradiations. For crystals irradiated along channelling directions the distributions are shifted towards larger depths, and the damage density is reduced by an order of magnitude. For high doses (∼6 × 1014 ions cm−2 in random orientation) the loops are seen to coalesce and to align along rows. This effect, probably due to the elastic loop interaction, is proposed as a stage in the damage development, preceding the formation of dislocation tangles.
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