(sorry for my poor english proficiency.I'm not a native speaker,I speak stupid words) but what I want to say is that one material used by al51f is ВЖМ4.this kind of Single Crystal Alloy is used to made turbine blades that can withstand 2100k this is definitely a cross-generational(thats why Russians prefer to call it the 5.5 generation engine)p.s.This is just an innovation point on this engine, there are more elsewhere