Join Date: Apr 2009
Location: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
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There's no problem with an aluminum post in a carbon frame, the opposite, but be sure to use either an antiseize or carbon assembly paste to prevent galvanic corrosion. The assembly past has the added benefit of improving traction so less clamping force is needed, so it would also make sense for carbon/carbon posts.
Now your first step is to determine the cause of the crack you heard. If you're lucky it'll be the replaceable clamp band, less lucky, you need a post, and if very unlucky, you cracked something on the frame. If the frame has built -in pinch bolt tear (rare in carbon frames) you may have cracked the tube or ear at the base, and will have a modification so you can change to a clamp band system.
An ounce of diagnosis is worth a pound of cure.
“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin
“One accurate measurement is worth a thousand expert opinions”
- Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance