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This^. I believe.
My first Ti frame was 6Al/4V.
Only one of a handful sold in the UK.
When it developed a crack around the BB, it was replaced under warranty, but with a 3Al/2.5V frame, on the basis that Reynolds deemed 6Al/4V tubing too expensive to produce commercially, and would only do so as a special order.ETA - It was a f'ing stiff frame, which still had springiness.
JurekB
Brommers
Other way round I believe. 6/4 isn't normally available as tube, so you end up having to form 6/4 tube by bending plate into a tube and welding the seam, rather like ERW steel.
'Ti-6Al-4V has always been the first titanium choice in the aerospace industry. Due to the fact that it is not a malleable alloy, it is more commonly used in sheet and plate applications.'