T651 Temper

T651 temper designation refers to a specific heat treatment process for aluminum alloys, particularly in the 6000 series. It involves solution heat treatment, then artificial aging, followed by a controlled stretch or strain to optimize mechanical properties. The result is a material that has excellent strength, good corrosion resistance, and improved formability, making it suitable for structural and aerospace applications. Essentially, T651 indicates the aluminum has been carefully treated to achieve a reliable balance of hardness, toughness, and stability for demanding uses.