What materials are used in a Rolls-Royce RB211-524 Engine?
There is some variation. The RB211 was to be one of the first engines to use a fan stage made in carbon fiber (Hyfil), but that plan was changed in a late stadium and the fan stage was done in titanium instead.  Conways did use Hyfil, IIRC.
Otherwise it's mostly steel and aluminium, with some titanium. Copper for the wiring etc.