Why are 6061 and 6063 aluminum alloys widely used in transportation and construction?

Aluminum alloys 6061 and 6063 are part of the 6XXX series, which are aluminum-magnesium-silicon alloys. These alloys are widely utilized in transportation and construction because they develop high strength through thermal treatments that precipitate fine ${\text{Mg}}_2\text{Si}$ particles.1

• 6063 Alloys: These are primarily used as extrusions for architectural applications, including window frames, storm doors, and furniture tubing.1
• 6061 Alloys: These are employed in the transportation industry for components such as truck, boat, and railroad car parts. Because they are precipitation-strengthened and lightweight, 6061 truck wheels help save fuel compared to steel alternatives. Additionally, 6061 is used in heavy-duty structures and pipelines due to its excellent corrosion resistance.1

Both alloys benefit from precipitation hardening, a process where the metal is heated to dissolve solutes and then aged to form fine precipitates, which significantly increases the material's strength for demanding structural applications.12