There's a good article on galling on Wikipedia:
https://en.wikipedia.org/wiki/GallingAs for titanium, here's a relevant excerpt with added emphasis:
"if the metal has a high number of stacking faults (a difference in stacking sequence between atomic planes) it will be less apt to cross-slip at the dislocations. Therefore, a material's resistance to galling is usually determined by its stacking-fault energy.
A material with high stacking-fault energy, such as aluminum or titanium, will be far more susceptible to galling than materials with low stacking-fault energy, like copper, bronze, or gold."
And, no, don't be replacing everything with gold fasteners!