This article describes a project in which the Retrogression and Re-aging (RRA) heat treatment was demonstrated to be a viable means of improving the corrosion resistance of 7075-T651 components of the Royal Australian Air Force AP-3C and C-130J-30 aircraft while maintaining the mechanical properties above the material’s A-Basis and preserving component functionality. This was achieved by a phased development process starting with the determination of the mechanical properties of the RRA-treated material and culminating in technology demonstrators on thick-section C-130J-30 lower ring segment components and a thin-section AP-3C component. This article describes the results obtained and the lessons learned during the process.
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