Different alloys have different properties i.e. Weldability, ductility, malleability, etc.. and as such are suited to different tasks eg 7075 high strength, good fatigue life, slightly brittle - good for cranks, ok for hubs. 2014 good strength, high fatigue life , hard to work - good for hubs, difficut to make into rims.
The T* designation is the heat treatment level, T0 - fully annealed, T4 - half hard, T6 - 3/4 hard.
For more specific alloy information try www.matweb.com
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