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Best aluminum--Scandium, 6061 T-6, or 7005?


I've heard that scandium is expensive because it is rare. But let's say we made a 3 bike frames, each weighing 4 pounds, which would be tougest and last the longest? (For biketrials, mountain biking, etc.).

Scandium, 6061 T-6 or 7005?

Too technical - rather too chemical or physical.
I doubt those chemists or metallurgist have time to participate in Yahoo answer.

All the best!
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