Abstract
Thin foil specimens of Nimonic PE16 have been examined, using transmission electron microscopy, after dual-beam particle accelerator irradiation with helium and nickel ions. Irregular extrinsic stacking faults were observed and various possible reasons for their shape are discussed. The distribution of these extrinsic faults on specific {111} planes is dependent upon the orientation of the specimen with respect to the direction of the ion beams used. Kinked perfect dislocation loops have been observed and are shown to be vacancy sinks.
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