6061 depending on Grade will crack when trying to bend it, other grades do bend, 6061 can be bent once you anneal the area where you want to bend
6061. This is one of the most versatile of the heat treatable family of alloys. In the annealed condition, it can be used for bending since the difference between yield and tensile strength is 10 Ksi and elongation is up to 18%. When moving up to T4 and T6 tempers, however, bending ability tends to decrease. Bending these tempered alloys is not impossible, but requires great caution and probably larger bending radii to avoid cracking.
5052. 5052 is a close second. At the annealed temper, it has an elongation of 20% and the difference between yield and tensile strength of 21.5 Ksi. It is the highest strength alloy of the more common non-heat treatable grades. It has excellent corrosion behavior and in the annealed condition has better formability than 3003 or even 1100 alloys, with 21.5 Ksi of difference between yield and tensile strength and up to 20% of elongation.
3003. This would be the best solution for most application. This alloy exhibits medium strength, the best cold workability together with high elongation such as 25% and one of the biggest differences between yield and tensile strength of 14 Ksi (Kilo-pound of force per square inch) at 0 temper – annealed, followed by the H14 temper which is partially annealed and strain hardened.