Abstract
Many examples of repeated precipitation on climbing dislocations have been reported since the original observations of NbC formation on climbing Frank partials in stainless steel. Striking precipitate arrays were observed in Cu-Ag (5), Si-Cu (6) and Al-Cu (7,8) but again the precise formation mechanisms have not been identified. The configurations of theta' in Al-4w/o Cu first described by Guyot and Wintenberger and studied in detail by Headley and Hren (8,9) can be produced by a direct quench from the solution treatment temperature to a high final aging temperature (> about 160/sup 0/C) circumventing the precursory GP zone and theta'' formation. While the overall nature of the precipitate arrays is now understood, the basic processes giving rise to the various, often complex, precipitate structures is not. Guyot and Wintenberger proposed that repeated nucleation of theta' occurred on (100) plane segments of the climbing edge dislocation, and described the slip and climb processes required to produce observed configurations.
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