There is no case of a jet engine vapourising,
Aluminium will burn at the right temperature.
Titanium alloys, such as they use for turbines and blades. require an enormous amount more temperature. Outside of a resarch furnace, it can not be found. Even a blast furnace will not melt or burn this stuff, although an eloctrostatic furnace can.

I never worked in a jet engine lab, but I studied some mettalurgy.