Influence of microstructure on the mechanical
- Cite this article as:
- Adler, P.N., Delasi, R. & Geschwind, G. MT (1972) 3: 3191. doi:10.1007/BF02661333
The significance of matrix and grain boundary microstructural characteristics on the mechanical properties and stress corrosion susceptibility of 7075 aluminum alloy has been evaluated. Maximum strength was found to be associated with a Guinier-Preston zone matrix. The precipitate-free-zone adjacent to high angle grain boundaries had only a slight effect on yield and tensile strength but a greater influence on hardness. Stress corrosion susceptibility was studied in an aqueous chloride environment over a 0.7–3.5 pH range. For material of highest strength, grain boundary precipitate spacing was found to be of primary importance to susceptibility. The effect of grain boundary precipitate spacing is most significant to the crack propagation stage of stress corrosion. These results indicate that improved properties for Al-Mg-Zn type alloys could be attained by a desirable combination of matrix and grain boundary structure.