For the record, superalloy ingame is used in most applications where you might expect to see a titanium alloy (bionics, energy weapons, experimental armor) and it seems titanium is a common component in real world superalloys. Superalloy also seems to exhibit similar properties to titanium in its material definition.
If anyone has their heart set on titanium for something, I recommend just using superalloy.
EDIT: For further reference with regards to armor, it’s mainly used where weight is a concern, since high-grade steel or composite materials outperform it in nearly every other way. Titanium is significantly lighter, but it’s also somewhat softer than top-end steels and is noticeably more brittle, meaning it tends to shatter and spray whatever it’s on with spalling (small shards of armor) if it is penetrated. Pound for pound titanium would beat hard steel as armor, but it can be beaten on volume or cost. I’m not an expert, just did some minor research, so this might not be comprehensive but hopefully it might help someone.
