Aluminium Swarf Recycling for Low-Carbon Aerospace Structures

Aluminium remains a cornerstone material in aerospace manufacturing, yet its production is associated with high carbon emissions due to energy-intensive mining and smelting processes. While billet suppliers increasingly incorporate recycled content, primary aluminium continues to dominate, contributing significantly to upstream Scope 3 emissions. Concurrently, machining operations generate large volumes of high-grade aluminium swarf, particularly from structural components with high buy-to-fly ratios. Despite its quality, this swarf is often treated as non-strategic waste, entering bulk recycling streams that degrade traceability and limit reuse in aerospace applications.

Led by GKN Aerospace, a leading multi-technology tier 1 aerospace supplier in collaboration with Novelis, a world leader in aluminium recycling, this initiative explores the transformation of swarf from waste into a strategic feedstock. The journey began with a reassessment of internal material flows and the identification of opportunities to reintroduce swarf into billet production. Key enablers included the development of segregation protocols to preserve material integrity and the implementation of traceability systems to link swarf with its original billet and downstream applications.

The effort also responds to evolving regulatory and market pressures, including carbon border adjustment mechanisms and increasing customer demands for transparency in embodied emissions. By aligning internal manufacturing practices with external sustainability drivers, the initiative lays the foundation for a closed-loop recycling system capable of supporting aerospace-grade applications.

Ongoing work focuses on validating mechanical performance through rigorous testing, establishing qualification pathways, and refining digital traceability to ensure full loop closure. This approach demonstrates how legacy manufacturing processes can be reimagined to support low-carbon aerospace structures, without compromising quality or reliability. It offers a scalable model for broader deployment across metallic systems and production sites, contributing to the industry's transition toward sustainable and resilient supply chains.