Abstract
Thin copper wires, approximately 50 μm in diameter, were irradiated by a 20-keV Ar ion beam in directions parallel and perpendicular to their axes and studied by scanning electron microscopy (SEM). It was found that overall shape of the wire approaches that of a cone and that small subsidiary cones observed at low ion doses persist through higher doses. To examine the evolution of both kinds of cones, irradiation by Ar ions alternated with observation by SEM was performed. Two kinds of apex angles of the cones were found. The evolution of the cones is possibly affected by the cold work present in the wires. Erosion rates were estimated from observations at typical parts of the surface and showed striking local differences.
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