The main advantages of Nickel superalloys at high temperatures are:

  • good mechanical characteristics for short and long-term applications;
  • good resistance to hot oxidation (which can be improved through the use of suitable surface coatings).

Over the years, several nickel superalloys have been developed both from a compositional and a microstructural point of view.

  • On a compositional level, the most recent alloys show fewer chromium and cobalt and more rhenium and ruthenium.
  • As far as the microstructural aspect is concerned, on the other hand, nickel superalloys have an austenitic matrix (FCC) with intermetallic precipitates and a high quantity of carbides and borides.