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Initiation of TGSCC can take place under deep locally dealloyed sites formed on the specimen outer surface. However, in anodically polarised a-brass specimens dealloying in cracks is observed as an even layer in bulk metal below the fracture surface covered by cuprous oxide. However, the solubility of zinc ions in cuprous oxide is very low and, thus, the oxides are immiscible [lo]. The increase in the flux of zinc ions through the cuprous oxide barrier layer caused by anodic polarisation occurs because it obviously can occupy both lattice and interstitial ion sites.

4(a)). Earlier studies [ll]showed that such geometrical instabilities can develop along a planar interface and grow exponentiallywith time. Recent theoretical treatments [ 121 Environment-Induced Deformation Localisation in a-Brass Fig. 4 (a) Proposed dissolution profile showing periodicity and high vacancy concentration at high penetration sites. (b) Deformation pattern developedfvom the dissolution profile shown in (a) indicating relationship between slip localisation and corrosion periodicity.

E. I. Meletis, Areview of present mechanisms of transgranular stress corrosion cracking, J. Meck. Bekav. , 1996, 7(1), 1-14. 11. C. Wagner, Contributions to the theory of electropolishing, J. Electrockem. , 1954,101, 225-228. 12. I? G. Santarini, Theorie de l'instabilite interfaciale morphologique cas des phenomenes de dissolution et de depot, J. Ckim. , 1985,82(1), 49-58. 13. A. F. Jankowski,Anodically enhanced diffusion in Cu/Au thin film couples, Scripta Metall. , 1993, 29, 701-706. 14. E. C.

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