Abstract
The present study has describedthe stress-corrosion cracking (SCC) processes in a high purity Al–Zn–Mg alloy under constant strain-rate in terms of the stress-corrosion (SC) crack growth rate and the SCC fracture mode. The SC crack growth rates calculated using a simple concept are in good agreement with the observed values in cases favourably susceptible or more resistant to SCC. The SCC fractography showed the transition from the intergranular brittle fracture near the surface over the mixed fracture zone to the dimpled rupture inside the specimen. The dimple size in the SCC fracture surfaces decreased as one moved from the surface to the inside of the specimen. This has been discussed in terms of hydrogen effects.
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