@Borg
We definetly do not have that material technology if we have not reach it in the last 1-2 years.
I am not a specialist in turbines but I know a little bit about materials.
Turbines have a certain optimum rpm for each design. Probably TS1400 did not reach 50-60 thousand rpms because simply it does not need it. I am not going to talk about TS1400 but I will meka a comparision.
You can not consider one variable in a very complicated system like a turbine but I will keep is very simple. Lets just consider turbine blades and tempreature under various rpms. Take 2 different models. One is small like TS1400 and other large as a fighter jet's turbine.
Small turbine blades gets less stress because of centrifugal forces. Why? Simple; they have smaller diameters. That is just simple. When you get larger diameter stresses become more significant. This is why you can use just chrome with a
very small turbine and get 100-120k rpms.
With higher temperatures your material simply gets softer. (Keeping simple) This is why we need very complicated alloys for turbines. And this is why monocrystalline materials are used for this purpose generally because they are very durable against extreme stresses. (not always but monocrystalline materials are very common in turbines)
When you get into turbines for fighter jets you get a lot of problems. First of all they are really hot and really large. This is the worst thing while designing something with very high rpms. You need hell lot of material knowlage. Plus; while they are working a lot of variable accerelation for various directions are applied. This is something you do not want on a really fast spinning metal chunk because you dont even want a very small precession which will result with complete disaster. So; you need much more durable material for that turbine which is moving in a maneuvering plane than a turbine which is stationary. List goes on... An expert on turbines would be more helpful for those details.
I believe that we don't have technology for high end turbines yet. But we can get that technology within our country by the work of defence industry and civillian industry. For example Tekfen has some amazing superalloy production capabilities for static systems like extremly high pressure tanks. With collabaration within out companies I think we can archive that.
Our country is definetly investing on material knowlage which is our biggest problem in developing and producing new technologies for a long time. As I said before in many posts; we have many amazing experts both in and outside of our country. We just need planning. We can build that type of technologies but we just need willpower and planning.