What is the coef of thermal expansion for ti?

The delta between Ti and Al is worse than the delta between Fe and Al.
See:
http://www.handyharmancanada.com/TheBrazingBook/comparis.htm

The SR81 had a problem with that as I recall.

"SR81" ? Do you mean SR-71 Blackbird?  If so, the "problem" isn't with
Ti per se, it's that the skin (whatever you choose to make it out of) is
gonna expand like crazy since the skin friction causes temperatures to
go very high (thousands of degrees).  In some places, to accommodate
this expansion, pliable expansion joints were added.  Those joints tend
to leak fuel while the aircraft is parked.  And of course the fuel isn't
standard JP-4.

Russell Kent

Right  SR71. The delta T between the parts is not what I had in mind. What
is the coef of expansion of both steel and ti. I an worried about the
distortion of the steel insert part due to non uniform temperature
distribution on the part itself.

Paul Lamar

Another problem with titanium is lousy thermal conductivity - even less
than alumina (the ceramic) we actually used it for thermal isolation
in some rocket applications - Vance

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