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1 Advances in Materials Science

1 2002

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Influence of retrogression and reaging (RRA) heat treatment on microstructure, mechanical and chemi-cal behaviour of an Al-Zn-Mg alloy

Zieliński A., Warmuzek M., Gazda A., Jezierska E., Chrzanowski J.

Advances in Materials Science

2002

Vol. 2, nr 1(2)

33-69

The Al-Zn-Mg alloy of the T6 temper alone or followed by the retrogression and Reaging beat treatment was investigated. The mechanical properties were determined with the slow strain rate test in air or sub-stitute sea water environments, and fracture energy, elongation and RA calculated. The fracture faces after the tensile tests were examined with the SEM. The microstructure and dislocation network were examined with the TEM. The beat treatment affected the investigated features: alloy subject only to the T6 temper demonstrated the best mechanical properties and the highest susceptibility to stress corrosion cracking. The increase in retrogression temperature and decrease in retrogression time positively influenced the resistance to SCC. The observed effects were explained by change in microstructure which caused changes in hydrogen diffusion and trapping, and then initiation and propagation of cracks.