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Effect of Retrogression and Reaging Heat Treatment on Microstructure and Corrosion Properties of Al-7075

P.L. Srinivasamurthy, B.N.Sarada, Karthik.B.S, Shamanth.S.Holla

Aluminum alloy 7075 has been widely used in aircraft structural application for many years. It is, however, prone to both stress corrosion cracking (SCC) and exfoliation (intergranular) corrosion. Over-aging has been used to resolve these problems. However, a strength penalty of around 10% is reported by researchers. Therefore, a process known as retrogression and reaging (RRA) treatment, which is capable of restoring peak strength while retaining resistance to SCC is suggested. The retrogression treatment produces rapid initial coarsening of the grain boundary particles and results in an increase in the volume per unit grain boundary area. This project is set up to study the influence of retrogression and reaging (RRA) heat treatment on the corrosion properties and of the aluminum alloy. The retrogression temperature is the main property controlling factor.