Effects of Relatively Insoluble Compounds and β Phase on Stress Corrosion Cracking in 5083 Aluminum Alloy(Materials, Metallurgy, Weldability)

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An investigation has been made into the effects of relatively insoluble compounds and β phase on stress corrosion cracking (SCC) in 3.5% NaCl+0.5% H_2O_2 solution for Al-Mg series 5083 aluminum alloy. The 5083-O material used for this investigation has rolling texture structure and highly directional grain boundaries. Therefore, there were much more susceptible to SCC when stress direction was in the short transverse direction (ST) than in the longitudinal direction (L), and consequently it is considered that the lower critical stress on the ST direction specimen is hardly present. The relatively insoluble compounds themselves hardly affect the susceptibility to SCC. On the specimen, the susceptibility to SCC increases as the quantity of β phase increases and the β phase precipitation is accelerated with decreasing in the quantity of relatively insoluble compounds. The susceptibility to SCC on the specimen increases with decreasing in the quantity of relatively insoluble compounds. In the case of welding by large heat input, SCC occured at the bond area of welds according to above reason. For the SCC, the fracture morphology showed the intergranular fracture with facet pits when β phase hardly precipitates at the grain boundary. The formation of facet pits at the grain boundary decreases with increasing of β phase precipitation at the grain boundary, and the fracture morphology of SCC showed flat intergranualr fracture without facet pits when β phase precipitates at the grain boundary continuously. It is considered that facet pits result from microplasticity at the grain boundary while SCC propagates.
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Effects of Relatively Insoluble Compounds and β Phase on Stress Corrosion Cracking in 5083 Aluminum Alloy(Materials, Metallurgy, Weldability)

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