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Grain boundary fractures of Al-Zn-Mg alloys are generally observed in stress-corrosion tests in aqueous chloride environments, although they are often observed in tensile or bending test in air under certain conditions of heat treatment. This deterioration in properties has been considered to be due to the grain boundary precipitates or the precipitate-free zones along grain boundaries (called PFZ in the following). As to the matter, Varley et al.(1), Thomas and Nutting(2) and Polmear(3) have strongly argued that the PFZ would be deleterious owing to preferential plastic deformation and fracture in the zones, while Ryum et al.(4)(5) showed that deformation occured in narrow slip bands through the grains. They suggested that the presence of PFZ has the tendency to suppress crack formation if the width is sufficiently large to permit the local stress to be relaxed by plastic yielding in the zones.

Effects of Additional Elements and Heat Treatments on the Fracture Characteristics of Al&ndash;Zn&ndash;Mg Alloy

Effects of Additional Elements and Heat Treatments on the Fracture Characteristics of Al–Zn–Mg Alloy