Question Guys arent the turbo blades made from titanium and not aluminium because of hi EGT,s aluminium melts at 1220 F but i hit 1400+ constant:eek: pulling a heavy load on a 5% grade hill on stock turbo if they are made from aluminium we would be changing turbo's like we change draws!! How come i have not melted my turbo??

Most turbine blades/ wheels are made of Inconel or a combo there of. I am a jet engine mech and our turbine blades/ wheels are similar to turbocharger turbine wheels.
Inconel starts to melt at around 2400F.

I would be worried about our Aluminum heads then.

Inconel on the exhaust side.

Ti or Al on the intake side.

I believe it helps that it is hot air and it doesnt transfer as fast to the metal

In the combustion chamber there is actually a "cushion" of cooler air that buffers the high temps from even reaching the heads and pistons. And yes air it self does not transfer heat very well, thank goodness or we'd all be in a world of hurt.

You will usually melt a piston before a turbo. On a turbo, you will/can damage the seals with excessive heat. If you catch it soon enough there is minamul damage. Usually just a minor turbo rebuild.

I've seen chewed up turbine wheels from an otherwise fine running truck.

But it took a hell of a lot more than 1400* sustained to make them that way....YMMV....

The blades weren't that bad. :D

The Turbine blades have no cooling available to them, unlike your pistons and heads. So the turbo is a prime target to fail from high EGTs. However, they don't usually melt per se. They tend to tear themselves apart as the metal weakens from the elevated temp and ludicrous speeds.