Mechanistic studies carried out during the past few years have helped elucidate both the microstructural features(1-4) and environmental factors(5-8) associated with the propagation of stress corrosion cracks in an Al-Zn-Mg ternary alloy. These studies led to the view that the rate-controlling step in crack propagation, within the precipitate-free zone (PFZ) of the ternary alloy, was the stress-assisted dissolution of the aluminum solid solution interspersed between the MgZn2 particles at the grain boundary. Thus, a non-susceptible structure in these alloys was identified as one containing a large spacing between MgZn2 particles.

Subject
Composition, Magnesium alloys, Fracture surfaces, Oxide films, Copper alloys, Purity, Commercial alloys, Surface profile, Aluminum alloys, Grain boundary, Alloys, Stress corrosion cracking, Hydrogen
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1977
Association for Materials Protection and Performance (AMPP)
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