Alloy design using CALPHAD and data-mining: application to nickel-based single-crystal superalloys

Edern Menou, Safran Tech, Magny-les-Hameaux, France

The reduction of greenhouse gas emissions imposed by recent regulations requires the increase of service temperatures of aircraft engines, meaning improved high-temperature materials are needed. Nickel-based superalloys are good candidates but their development is hindered by two main factors: (i) the space of all possible superalloys is titanic and (ii) their characterisation is costly and time-consuming. Using the CALculation of PHAse Diagrams method and data-mining to model their properties helps circumventing these issues. In this work, three hundred million potential compositions are screened for optimal stability, creep life, corrosion resistance and density. Hundreds of novel alloys are found, which are superior to commercially-available nickel-based single-crystal superalloys. Results show that known metallurgical rules linking composition, microstructure and properties are found to be respected, although significant discrepancies between thermodynamic databases are observed.

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Session T1: Tuesday, 26 June 2018

Start: 10:15 a.m.
End: 10:30 a.m.