Change in structure and properties in stepped aging of V95 aluminum alloy plates

Conclusions

• 1. Stepped aging of V95 alloy, leading to a decrease in the yield strength of not less than 9–12% (T2 condition) and 15–20% (T3 condition) in comparison with the T1 condition, provides a change in the investigated corrosion characteristics by not less than ∼85 and 100%, respectively, of the possible change in these properties.

• 2. A decrease in the hardening rate within the investigated limits leads to a decrease in the maximum of the tensile and yield strengths by 20–30 MPa and makes it possible to reduce the aging time until reaching the maximum in these characteristics by ∼2 h. In addition, the strength characteristics in overaging, the investigated corrosion characteristics, and the electrical resistance do not change but the character of precipitates in aging does changes.

• 3. With an increase in aging time the corrosion character in intergranular corrosion and exfoliation corrosion tests changes from preferential damage of the boundaries elongated in the rolling direction to damage of the majority of the fragment boundaries. This is caused by equalization of the intensity of decomposition in the boundaries of different types in overaging.