A model consistent with experimental observations for stress corrosion cracking in 7075-T6 aluminum has been formulated. The model utilizes fracture mechanics criteria with the experimental observations that bond strength is lessened by adsorption of a damaging species. It is predicted that the point of maximum stress triaxiality, the elastic/plastic interface, is the precise region where the damaging species should migrate. Autoradiography has shown that chloride ion migrates to this area. Crack morphology studies on 7075-T651 aluminum loaded in three point bending have shown that a transgranular crack initiating from the notch root is not connected to an intergranular stress corrosion crack parallel to the principal applied tensile stress. Calculations have shown that the distance between the transgranular and intergranular cracks is about the same as the predicted plastic zone size.

Subject
Materials, Intergranular stress corrosion cracking, Aluminum, Chloride ions, Transgranular stress corrosion cracking, Stress, Plastics, Titanium, Aluminum alloys, Grain boundary, Grain, Stress corrosion cracking, Chloride stress corrosion cracking
© 1970 National Association of Corrosion Engineers
1970
You do not currently have access to this content.