Which rivet can be used as received without further treatment?

The choice of 2117-T3 rivets as suitable for use without further treatment is appropriate because these rivets are made from a type of aluminum alloy that has a good balance of strength, ductility, and corrosion resistance in the T3 temper. The T3 designation indicates that the material has been solution heat treated and artificially aged, allowing it to reach its desired mechanical properties and making it ready for immediate use in applications without the need for additional processes.

In contrast, 2024-T3 rivets, while high-strength, often require more careful handling and preparation due to their susceptibility to corrosion and the need for protective treatments before use. Similarly, 7075-T6 rivets are known for their exceptional strength but are not typically used in their T6 state as they might be too brittle for certain applications and thus require additional processing for optimal performance. Lastly, 6061-T6 rivets are also strong, yet usually need to be anodized or treated for improved surface durability and corrosion resistance before they can be effectively employed in structural applications.

The readiness of 2117-T3 rivets for immediate use is essential, especially in the context of sheet metal and non-metallic structures, where ease of installation and reliability are paramount.