I'm sure they are proprietary, but based on something like inconel. Oh, just saw this was under WIND power. I was thinking gas or steam turbine. Wind turbine blades are generally composites. Fiberglass/epoxy or carbon fiber/epoxy layups, like airplane propellers.

HP Turbine is High Performance Turbine

LP Turbine is Low Performance Turbine

Turbine is not a change, a turbine is a mechanical device.

in a radial flow turbine the steam enters the turbine in the direction of its radius and leaves it in the direction of the axis of the shaft. in a axial flow turbine the steam enters the turbine in the direction of the axis of the shaft and leaves the turbine in the same direction.

Turbine is the correct spelling.