You are absolutely right, casting large objects with homogeneous composition and mechanical properties is very difficult practically. Slightly off topic, but th

You are absolutely right, casting large objects with homogeneous composition and mechanical properties is very difficult practically. Slightly off topic, but the turbine blades used in the aircraft/marine/power engines are grown from single crystal for similar reasons. https://en.wikipedia.org/wiki/Single_crystal https://en.wikipedia.org/wiki/Single_crystal