Are titanium axles legal? Do different associations/classes have different rules pertaining to this? I typically run a 4 stroke but just curious in general.
Not sure about USA, in Australia the answer is No it would not be allowed (point F in the first picture).
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Indeed you’ll have to check with the rule set governing the races you run. Typically only ferrous materials are permitted. So titanium, aluminum and carbon are out.
No URANIUM??? 
I don’t see Plutonium or Tritium listed on there though!!!
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I’m so bad at wrenching stuff tho!
Uranium would be a lot safer for ballast than lead. It’s a lot harder so you won’t get flakes and contamination of seats.
Ti is notch sensitive, which is a slight problem if you’ve got a key under the brake rotor preventing impact loads from spinning it round.
I’ve read that bismuth is an alternative to lead. I prefer to use 24karat gold, personally.