| Abstract: | Model experiments concerning the mechanism of stress corrosion cracking of AlZnMg alloys For the experimental clarification of scc of AlZnMg alloys, tubes were inside filled with the corrosive medium and subjected to tensile stresses. In order to increase localised tension, circumferencial notches were made. The formation of sccfracture on the outside of the tubes can only be explained by hydrogen embrittlement. The equilibrium solubility of the grain boundary for hydrogen is dependent upon the value of the effective normal tensile stress. The grain boundary adhesive strength is reduced to the diffused hydrogen producing a decohesive effect. This results in intercrystalline brittle fracture in the range of the elastic tension. |
