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Grade 1 is pure Titanium, Grade 5 is an alloy and includes Aluminum and Vanadium I believe.
For armour people tend towards Gr5 since it has the highest elasticity value.
Grade5 is tougher but brittle, grade1 is more ductile but lacks the toughness of grade5. Grades 1 to 2 can be bent to shape relatively easily. Bending grade5 is not easy and requires some serious heat and press tooling.
With a proper bending machine, you'll be able to bend Gr5 Ti, but you'll have to bend a bit further as it will spring back, also tight angles are difficult to produce as it will most probably snap at sheet thickness above 2mm.
Anything below Gr5 Ti is pure titanium - and in my opinion not good for armour - the only advantage I can think of being its lighter weight and hardness. Compared to steel or aluminium, strength wise its similar to mild steel or aluminium 2024T3. Aluminium 7075T6 is even stronger.
True - depends on what thickness and what angle you bend.
I've bent 1.5mm without any problems at all, no heating used. A proper bending machine is a must though as well as good edge preparation of the sheet to be folded.
For intricate shapes I'd prefer to cut to size and then weld or bolt together.
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